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Muj posing for camera, French doctors working at a hospital & Muj life in Panjshir Province.
Topics: Afghanistan, amrc, Afghan Media Resource Center
Afghan Media Resource Center
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78 RPMs and Cylinder Recordings
by Perry Como; The Fontane Sisters; Kaye; Wise; Lippman; Mitchell Ayres
audio

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Performer: Perry Como; The Fontane Sisters Writer: Kaye; Wise; Lippman Orch. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.5 mil truncated eliptical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. These were recorded flat and then also equalized with Turnover: 400.0, Rolloff: -12.0. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames....
( 1 reviews )
Topics: 78rpm, Popular Music
Source: 78
78 RPMs and Cylinder Recordings
by Rosalind Paige; The New Yorkers; Kaye; Wise; Lippman
audio

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Performer: Rosalind Paige; The New Yorkers Writer: Kaye; Wise; Lippman Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 2.0 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. These were recorded flat and then also equalized with Turnover: 400.0, Rolloff: -12.0. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix...
( 1 reviews )
Topics: 78rpm, Popular Music
Source: 78
Arxiv.org
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Models in which the "dark" halo particles have mutual and potentially also appreciable nuclear interactions have been considered by various authors. In this note we briefly point out strategies for a most sensitive search for these particles. We show that a particular matter/anti-matter symmetric variant due to Farrar et al. is excluded by combining bounds on proton decay from various experiments and from super-Kamiokande and atmospheric neutrino measurements at super-Kamiokande.
Source: http://arxiv.org/abs/hep-ph/0406259v1
78 RPMs and Cylinder Recordings
by Lucy Isabelle Marsh; Victor Chorus; McLellan; Caryll
audio

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Performer: Lucy Isabelle Marsh; Victor Chorus Writer: McLellan; Caryll Waltz; Soprano with chorus and orchestra; from "The Pink Lady". Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix number:...
( 1 reviews )
Topics: 78rpm, Popular Music, acoustic
Source: 78
78 RPMs and Cylinder Recordings
by Barney Bigard and Orchestra; Duke Ellington
audio

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Performer: Barney Bigard and Orchestra Writer: Duke Ellington Fox Trot; An Ellington Unit. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.5 mil truncated eliptical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. These were recorded flat and then also equalized with Turnover: 400.0, Rolloff: -12.0. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more...
( 1 reviews )
Topics: 78rpm, Instrumental
Source: 78
Arxiv.org
by Hubert Lampeitl; Werner Hofmann
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Observations of air showers with the stereoscopic HEGRA IACT system are usually carried out in a mode where all telescopes point in the same direction. Alternatively, one could take into account the finite distance to the shower maximum and orient the telescopes such that their optical axes intersect at the average height of the shower maximum. In this paper we show that this ``convergent observation mode'' is advantageous for the observation of extended sources and for surveys, based on a...
Source: http://arxiv.org/abs/astro-ph/9910461v1
78 RPMs and Cylinder Recordings
by the Seven Dwarfs; Frank Churchill; Larry Morey
audio

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Performer: the Seven Dwarfs Writer: Frank Churchill; Larry Morey From the Walt Disney Feature film, "Snow White and the Seven Dwarfs"; As Originally sung by the Seven Dwarfs (with dialogue and sound effects). Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. These were recorded flat and then also equalized with Turnover: 375.0,...
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Topics: 78rpm, Popular Music
Source: 78
Arxiv.org
by S. Akras; W. Steffen
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BD +30 3639 is a member of a group of uncommon planetary nebula with Wolf-Rayet central star and higher expansion velocities in [O III] than in [N II] lines. Images and high-resolution spectra from the literature are used in order to construct a 3-D model of the nebula using the morpho-kinematic code SHAPE. We find that two homologous expansion laws are needed for the [N II] and [O III] shell. We conclude that the internal velocity field of BD +30 3639 decreases with the distance from the...
Source: http://arxiv.org/abs/1203.3579v1
Arxiv.org
by M. R. Sakr; Maryam Rahimi; S. V. Kravchenko; P. T. Coleridge; R. L. Williams; J. Lapointe
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We show that in dilute metallic p-SiGe heterostructures, magnetic field can cause multiple quantum Hall-insulator-quantum Hall transitions. The insulating states are observed between quantum Hall states with filling factors \nu=1 and 2 and, for the first time, between \nu=2 and 3 and between \nu=4 and 6. The latter are in contradiction with the original global phase diagram for the quantum Hall effect. We suggest that the application of a (perpendicular) magnetic field induces insulating...
Source: http://arxiv.org/abs/cond-mat/0107171v1
Arxiv.org
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Anomaly-mediated supersymmetry breaking in the context of 4D conformally sequestered models is combined with Poppitz-Trivedi D-type gauge-mediation. The implementation of the two mediation mechanisms naturally leads to visible soft masses at the same scale so that they can cooperatively solve the mu and flavor problems of weak scale supersymmetry, as well as the tachyonic slepton problem of pure anomaly-mediation. The tools are developed in a modular fashion for more readily fitting into the...
Source: http://arxiv.org/abs/hep-th/0406012v1
78 RPMs and Cylinder Recordings
by Jean Goldkette and His Orchestra; Turk; Smith; Pinkard
audio

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Performer: Jean Goldkette and His Orchestra Writer: Turk; Smith; Pinkard Fox Trot; with vocal chorus. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated eliptical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated eliptical. These were recorded flat and then also equalized with Turnover: 250.0, Rolloff: -5.0. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have...
( 1 reviews )
Topics: 78rpm, Popular Music
Source: 78
Oberlin College Library Anti-Slavery Collection
by Guthrie, Thomas, 1803-1873
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Topic: War -- Religious aspects
Topics: Slavery -- United States, Slaves -- Social conditions
Topics: Slavery -- United States, Slaves -- Social conditions, Antislavery movements -- United States
Topics: Slavery -- United States, Slaves -- Social conditions, Antislavery movements -- United States
78 RPMs and Cylinder Recordings
by Arthur Pryor's Band; McCoy
audio

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Performer: Arthur Pryor's Band Writer: McCoy Military Band. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix number: 16960B Catalog number: 16960-B
( 1 reviews )
Topics: 78rpm, Instrumental, acoustic
Source: 78
78 RPMs and Cylinder Recordings
by Arthur Pryor's Band; E. E. McCoy
audio

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Performer: Arthur Pryor's Band Writer: E. E. McCoy Military Band. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix number: 18498B Catalog number: 18498-B
( 1 reviews )
Topics: 78rpm, Instrumental, acoustic
Source: 78
78 RPMs and Cylinder Recordings
by Arthur Pryor's Band; McCoy
audio

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Performer: Arthur Pryor's Band Writer: McCoy Military Band. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix number: 16960B Catalog number: 16960-B Other IDs from the record include: 4678
( 1 reviews )
Topics: 78rpm, Popular Music, acoustic
Source: 78
78 RPMs and Cylinder Recordings
by Arthur Fields; Gilbert; Baer
audio

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Performer: Arthur Fields Writer: Gilbert; Baer Tenor Solo. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. These were recorded flat and then also equalized with Turnover: 500.0. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix number: 151-2 Catalog...
favoritefavoritefavoritefavoritefavorite ( 1 reviews )
Topics: 78rpm, Novelty
Source: 78
Arxiv.org
by Natalia B. Janson; Christopher J. Marsden
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We propose an alternative approach to construct an artificial learning system, which naturally learns in an unsupervised manner. Its mathematical prototype is a dynamical system, which automatically shapes its vector field in response to the input signal. The vector field converges to a gradient of a multi-dimensional probability density distribution of the input process, taken with negative sign. The most probable patterns are represented by the stable fixed points, whose basins of attraction...
Source: http://arxiv.org/abs/1107.0674v2
Arxiv.org
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Setting an ansats that the metric is expressible by a power series of the inverse radius and taking a particular gauge choice, we construct a "general solution" of (2+1)-dimensional Einstein's equations with a negative cosmological constant in the case where the spacetime is asymptotically anti-de Sitter. Our general solution turns out to be parametrized by two centrally extended quadratic differentials on $S^{1}$. In order to include 3-dimensional Black Holes naturally into our...
Source: http://arxiv.org/abs/hep-th/9411166v1
Daniel McNeil Collection
by The Rhythmaires; Mimi Martel; Ronnie Deauville; Lew Raymond and Orch.
audio

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Performer: The Rhythmaires; Mimi Martel; Ronnie Deauville; Lew Raymond and Orch. 4 Hits On Each Record; Persian Lament; Vocal & Orch. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 2.0 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. These were recorded flat and then also equalized with Turnover: 400.0, Rolloff: -12.0. The preferred versions suggested by an audio engineer at George Blood,...
( 1 reviews )
Topics: 78rpm, Popular Music
Source: 78
78 RPMs and Cylinder Recordings
by Nat M. Wills
audio

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Performer: Nat M. Wills Comic Monologue. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated conical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated conical. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix number: 17222A Catalog number: 17222-A
( 3 reviews )
Topics: 78rpm, Comedy, acoustic
Source: 78
Oberlin College Library Anti-Slavery Collection
by Williams, William R., 1804-1885
texts

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Topic: United States -- History -- Civil War, 1861-1865
Arxiv.org
by Jens Madsen Houlrik; Germain Rousseaux
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The kinematics of particles refer to events and tangent vectors, while that of waves refer to dual gradient planes. Special relativity [1-3] applies to both objects alike. Here we show that spacetime exchange symmetry [7] implicit in the SIdefinition of length based on the universal constant c has profound consequences at low velocities. Galilean physics, exact in the limit c \to \infty, is mirrored by a dual so-called Carrollian superluminal kinematics [4-6] exact in the limit c \to 0. Several...
Source: http://arxiv.org/abs/1005.1762v1
Oberlin College Library Anti-Slavery Collection
by Scroggs, Gustavus Adolphus; Schaffer, Chauncey
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Topics: Law, George, 1806-1881 -- Correspondence, Marsh, Ephraim -- Correspondence, Campaign literature --...
78 RPMs and Cylinder Recordings
by Ted Lewis Jazz Band; Jack Kaufman; Gay and Johnson; Gay
audio

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Performer: Ted Lewis Jazz Band; Jack Kaufman Writer: Gay and Johnson; Gay Fox-trot; Dance Music; Incidental Chorus; Introducing: "The Vamp". Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8 mil truncated eliptical, 2.3 mil truncated conical, 2.8 mil truncated conical, 3.3 mil truncated eliptical. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix...
( 1 reviews )
Topics: 78rpm, Dance, acoustic
Source: 78
Arxiv.org
by Kazuyuki Fujii
texts

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When we start studying Quantum Mechanics the most difficult part to understand is the so-called Copenhagen interpretation. Usually beginners skip over this part, which is a wise choice in a certain sense. However, some researchers feel guilty about skipping over this. In this paper we try to give a proof to it. Our method is based on embedding it into decoherence theory. The method is of course not complete, but some researchers may feel relieved. To the best of our knowledge this is the finest...
Source: http://arxiv.org/abs/1304.1591v1
Arxiv.org
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We briefly discuss the transcendental constants generated through the epsilon-expansion of generalized hypergeometric functions and their interrelation with the "sixth root of unity."
Source: http://arxiv.org/abs/1007.2373v2
Arxiv.org
texts

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The FITS is the standard file format in astronomy, and it has been extended to agree with astronomical needs of the day. However, astronomical datasets have been inflating year by year. In case of ALMA telescope, a ~ TB scale 4-dimensional data cube may be produced for one target. Considering that typical Internet bandwidth is a few 10 MB/s at most, the original data cubes in FITS format are hosted on a VO server, and the region which a user is interested in should be cut out and transferred to...
Source: http://arxiv.org/abs/1304.5302v1
Arxiv.org
by T. G. Mueller; E. Lellouch; J. Stansberry; C. Kiss; P. Santos-Sanz; E. Vilenius; S. Protopapa; R. Moreno; M. Mueller; A. Delsanti; R. Duffard; S. Fornasier; O. Groussin; A. W. Harris; F. Henry; J. Horner; P. Lacerda; T. Lim; M. Mommert; J. L. Ortiz; M. Rengel; A. Thirouin; D. Trilling; A. Barucci; J. Crovisier; A. Doressoundiram; E. Dotto; P. J. Gutierrez; O. R. Hainaut; P. Hartogh; D. Hestroffer; M. Kidger; L. Lara; B. Swinyard; N. Thomas
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The goal of the Herschel Open Time Key programme "TNOs are Cool!" is to derive the physical and thermal properties for a large sample of Centaurs and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. We present results for seven targets either observed in PACS point-source, or in mini scan-map mode. Spitzer-MIPS observations were included for three objects. The sizes of these targets range from 100 km to almost 1000 km, five have low...
Source: http://arxiv.org/abs/1005.2923v1
Topics: Sermons, American -- New York (State) -- Buffalo, Fugitive slave law of 1850 -- Sermons,...
Topics: Slavery in the Bible, Slavery -- United States
Arxiv.org
by Pietro Caputo; Fabio Martinelli; Francois Simenhaus; Fabio Lucio Toninelli
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We consider the Glauber dynamics for the Ising model with "+" boundary conditions, at zero temperature or at temperature which goes to zero with the system size (hence the quotation marks in the title). In dimension d=3 we prove that an initial domain of linear size L of "-" spins disappears within a time \tau_+ which is at most L^2(\log L)^c and at least L^2/(c\log L), for some c>0. The proof of the upper bound proceeds via comparison with an auxiliary dynamics which...
Source: http://arxiv.org/abs/1007.3599v2
Arxiv.org
by Shuiguo Wen; Zhenyu Zhang; Jueping Liu
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Based on a semiclassical expansion for quantum chromodynamics in the instanton liquid background, the correlation function of the $0^{++}$ scalar glueball current is given, and the properties of the $0^{++}$ scalar glueball are studied in the framework of Gaussian sum rules. Besides the pure classical and quantum contributions, the contributions arising from the interactions between the classical instanton fields and quantum gluons are come into play. Instead of the usual zero-width...
Source: http://arxiv.org/abs/1007.2465v2
Arxiv.org
by Alan Adolphson; Steven Sperber
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We establish some connections between nonresonant $A$-hypergeometric systems and de Rham-type complexes. This allows us to determine which of these $A$-hypergeometric systems "come from geometry."
Source: http://arxiv.org/abs/1007.4030v1
Arxiv.org
by Andrew Conner; Pete Goetz
texts

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The notion of a $\mathcal{K}_2$-algebra was recently introduced by Cassidy and Shelton as a generalization of the notion of a Koszul algebra. The Yoneda algebra of any connected graded algebra admits a canonical $A_{\infty}$-algebra structure. This structure is trivial if the algebra is Koszul. We study the $A_{\infty}$-structure on the Yoneda algebra of a $\mathcal{K}_2$-algebra. For each non-negative integer $n$ we prove the existence of a $\mathcal{K}_2$-algebra $B$ and a canonical...
Source: http://arxiv.org/abs/1005.5185v2
Arxiv.org
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In this work, we study six tree-dominated $B \to a_1(1260) a_1(1260)$ and $b_1(1235) b_1(1235)$ decays in the perturbative QCD(pQCD) approach, where $a_1$($b_1$) is a $^3P_1$($^1P_1$) axial-vector meson. Based on the perturbative calculations and phenomenological analysis, we find that: (a) the CP-averaged branching ratio of $B^0 \to a_1^+ a_1^-$ decay in the pQCD approach is $54.7 \times 10^{-6}$, which agrees well with the current data and the predictions given in the QCD factorization...
Source: http://arxiv.org/abs/1203.6135v3
Arxiv.org
by Alina Vdovina
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We construct compact polyhedra with triangular faces whose links are generalized 3-gons. They are interesting compact spaces covered by Euclidean buildings of type $A_2$. Those spaces give us two-dimensional subshifts, which can be used to construct some $C^*$-algebras.
Source: http://arxiv.org/abs/math/0406162v1
Arxiv.org
by Stephan Ramon Garcia; William T. Ross; Warren R. Wogen
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We obtain an analogue of Coburn's description of the Toeplitz algebra in the setting of truncated Toeplitz operators. As a byproduct, we provide several examples of complex symmetric operators which are not unitarily equivalent to truncated Toeplitz operators having continuous symbols.
Source: http://arxiv.org/abs/1203.2412v3
Arxiv.org
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We prove a $C^{1,\alpha}$ interior regularity theorem for fully nonlinear uniformly elliptic integro-differential equations without assuming any regularity of the kernel. We then give some applications to linear theory and higher regularity of a special class of nonlinear operators.
Source: http://arxiv.org/abs/1304.7525v1
Arxiv.org
texts

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In this work we study solutions of the prescribed mean curvature equation over a general domain that do not necessarily attain the given boundary data. To such a solution, we can naturally associate a current with support in the closed cylinder above the domain and with boundary given by the prescribed boundary data and which inherits a natural minimizing property. Our main result is that its support is a $C^{1,\alpha}$ manifold-with-boundary, with boundary equal to the prescribed boundary...
Source: http://arxiv.org/abs/1007.3402v1
Arxiv.org
by Yan-Rui Liu; Makoto Oka; Makoto Takizawa; Xiang Liu; Wei-Zhen Deng; Shi-Lin Zhu
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S and P wave $D\bar{D}$ scatterings are studied in a meson exchange model with the coupling constants obtained in the heavy quark effective theory. With the extracted P wave phase shifts and the separable potential approximation, we include the $D\bar{D}$ rescattering effect and investigate the production process $e^+e^-\to D\bar{D}$. We find that it is difficult to explain the anomalous line shape observed by the BES collaboration with this mechanism. Combining our model calculation and the...
Source: http://arxiv.org/abs/1005.2262v2
Arxiv.org
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The strong decays of $D^\star_{s1}(2700)^\pm$ and $D^\star_{sJ}(2860)^\pm$ are investigated within the $^3P_0$ model. It is found that the interpretation of these two states depends on the mixing schemes and the ways of choices of the harmonic oscillator parameter $\beta$. If $D^\star_{s1}(2700)^\pm$ and $D^\star_{sJ}(2860)^\pm$ are two pure states, $D^\star_{s1}(2700)^\pm$ seems impossibly the $2^3S_1$ $D_s$, but may be the $1^3D_1$ $D_s$. $D^\star_{sJ}(2860)^\pm$ may be the $1^3D_3$. If there...
Source: http://arxiv.org/abs/1203.0370v1
Arxiv.org
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We consider the semileptonic and nonleptonic $D_s$ decay modes to final states with $\eta$ and $\eta^\prime$. We use QCD sum rules to determine the $D_s \to \eta$ form factor $f_+^\eta$, and a generalized factorization ansatz to compute nonleptonic decays. We propose a parameterization of possible OZI suppressed contributions producing the $\eta^\prime$ in the final state, compatible with current data; such a scheme can be further constrained improving the precision of the measurement of the...
Source: http://arxiv.org/abs/hep-ph/0107137v2
Arxiv.org
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A phenomenological analysis of the general two Higgs doublet model is presented. Possible constraints of the Yukawa couplings are obtained from the $K^0-\bar{K}^0, B^0-\bar{B}^0$ and $D^0-\bar{D}^0$ mixings. A much larger $D^0-\bar{D}^0$ mixing than the standard model prediction is possible. It is shown that the emerging of various new sources of CP violation in the model could strongly affect the determination of the unitarity triangle. It can be helpful to look for a signal of new physics by...
Source: http://arxiv.org/abs/hep-ph/9906313v2
Arxiv.org
by Leandro M. Del Pezzo; Sandra Martinez
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In this paper we study the $H^2$ global regularity for solutions of the $p(x)-$Laplacian in two dimensional convex domains with Dirichlet boundary conditions. Here $p:\Omega \to [p_1,\infty)$ with $p\in Lip(\bar{\Omega})$ and $p_1>1$.
Source: http://arxiv.org/abs/1107.3136v2
Arxiv.org
by N. Armesto; E. G. Ferreiro; F. del Moral; C. Pajares
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We study the enhancement of $c \bar c$ pair production that takes place in central heavy ion collisions due to the formation of clusters of strings. These clusters produce heavy flavors more efficiently due to their higher color. We discuss the competition between this mechanism and the well-known screening of color charge, which, above a critical string density, reduces strongly the probability of binding these $c \bar c$ pairs to form $J/\Psi$ particles. The dependence of $J/\Psi$ suppression...
Source: http://arxiv.org/abs/hep-ph/0107319v1
Arxiv.org
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We study the in-medium masses of the charmonium states $J/\psi$ and $\eta_{c}$ in the nuclear medium using QCD sum rule approach. These mass modifications arise due to modifications of the scalar and the twist-2 gluon condensates in the hot hadronic matter. The scalar gluon condensate, $ $ and the twist-2 tensorial gluon operator, $ $ in the nuclear medium are calculated from the medium modification of a scalar dilaton field introduced to incorporate trace anomaly of QCD within the chiral SU(3)...
Source: http://arxiv.org/abs/1005.2748v2
Arxiv.org
by Song Mao; Li Gang; Ma Wen-Gan; Zhang Ren-You; Guo Lei; Guo Jian-You
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We calculate the complete next-to-leading order (NLO) QCD corrections to the $J/\psi +W$ associated production within the factorization formalism of nonrelativistic QCD at the $7 TeV$ LHC. We provide the numerical results for the leading-order (LO), NLO QCD corrected differential cross sections of the $J/\psi$ transverse momentum by adopting the event selection criteria requested by the ATLAS experiment. We find that the differential cross section at the LO is significantly enhanced by the NLO...
Source: http://arxiv.org/abs/1304.4670v1
Arxiv.org
by Jia-Sheng Xu; Hong-An Peng; Zhan-Yuan Yan; Zhen-Min He
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We present a study of $J/\psi + jet$ diffractive production in the direct photon process at HERA based on the factorization theorem for lepton-induced hard diffractive scattering and the factorization formalism of the nonrelativistic QCD (NRQCD) for quarkonia production. Using the diffractive gluon distribution function extracted from HERA data on diffractive deep inelastic scattering and diffractive dijet photon production, we show that this process can be studied at HERA with present...
Source: http://arxiv.org/abs/hep-ph/9906306v1
Arxiv.org
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Let $\Gamma$ be a Coxeter graph, let $(W,S)$ be its associated Coxeter system, and let $(A,\Sigma$) be its associated Artin-Tits system. We regard $W$ as a reflection group acting on a real vector space $V$. Let $I$ be the Tits cone, and let $E_\Gamma$ be the complement in $I +iV$ of the reflecting hyperplanes. Recall that Charney, Davis, and Salvetti have constructed a simplicial complex $\Omega(\Gamma)$ having the same homotopy type as $E_\Gamma$. We observe that, if $T \subset S$, then...
Source: http://arxiv.org/abs/1007.1365v1
Arxiv.org
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Applying a quark combination model for the hadronization of Quark Gluon Plasma (QGP) and A Relativistic Transport (ART) model for the subsequent hadronic rescattering process, we investigate the production of $K^{*0}$ and $\Sigma^*$ resonances in central Au+Au collisions at $\sqrt{s_{NN}}=$ 200 GeV and 62.4 GeV. The initial $K^{*0}$ produced via hadronization is higher than the experimental data in the low $p_T$ region and is close to the data at 2-3 GeV/c. We take into account the hadronic...
Source: http://arxiv.org/abs/1203.0449v1
Arxiv.org
by Tomasz S. Mrowka; Katrin Wehrheim
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We examine the $L^2$-topology of the gauge orbits over a closed Riemann surface. We prove a subtle local slice theorem based on the div-curl Lemma of harmonic analysis, and deduce local pathwise connectedness and local uniform quasiconvexity of the gauge orbits. Using these, we generalize compactness results for anti-self-dual instantons with Lagrangian boundary counditions to general gauge invariant Lagrangian submanifolds. This provides the foundation for the construction of instanton Floer...
Source: http://arxiv.org/abs/1005.0731v1
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by Jordi Marzo; Kristian Seip
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The norm of the Riesz projection from $L^\infty(\T^n)$ to $L^p(\T^n)$ is considered. It is shown that for $n=1$, the norm equals $1$ if and only if $p\le 4$ and that the norm behaves asymptotically as $p/(\pi e)$ when $p\to \infty$. The critical exponent $p_n$ is the supremum of those $p$ for which the norm equals $1$. It is proved that $2+2/(2^n-1)\le p_n 1$; it is unknown whether the critical exponent for $n=\infty$ exceeds $2$.
Source: http://arxiv.org/abs/1005.1842v1
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The Dirichlet boundary value problem for the Stokes operator with $L^p$ data in any dimension on domains with conical singularity (not necessary a Lipschitz graph) is considered. We establish the solvability of the problem for all $p\in (2-\varepsilon,\infty]$ and also its solvability in $C(\overline{D})$ for the data in $C(\partial D)$
Source: http://arxiv.org/abs/1007.5495v1
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The aim of this paper is to study the spectrum of the $L^p$ Laplacian and the dynamics of the $L^p$ heat semigroup on non-compact locally symmetric spaces of higher rank. Our work here generalizes previously obtained results in the setting of locally symmetric spaces of rank one to higher rank spaces. Similarly as in the rank one case, it turns out that the $L^p$ heat semigroup on $M$ has a certain chaotic behavior if $p\in(1,2)$ whereas for $p\geq 2$ such a chaotic behavior never occurs.
Source: http://arxiv.org/abs/1005.2988v1
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by Jorge J. Betancor; Alejandro J. Castro; Pablo L. De Nápoli; Juan C. Fariña; Lourdes Rodríguez-Mesa
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In this paper we prove that the generalized (in the sense of Caffarelli and Calder\'on) maximal operators associated with heat semigroups for Bessel and Laguerre operators are weak type (1,1). Our results include other known ones and our proofs are simpler than the ones for the known special cases.
Source: http://arxiv.org/abs/1203.0848v1
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by Mathias Wilke
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In this paper we study a generalized Cahn-Hilliard equation which was proposed by Gurtin. We prove the existence and uniqueness of a local-in-time solution for a quasilinear version, that is, if the coefficients depend on the solution and its gradient. Moreover we show that local solutions to the corresponding semilinear problem exist globally as long as the physical potential satisfies certain growth conditions. Finally we study the long-time behaviour of the solutions and show that each...
Source: http://arxiv.org/abs/1203.4391v1
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We show that the $N=2$ and $N=4$ SUSY Yang-Mills action can be reformulated in the sense of non-commutative geometry on $M^4\times (Z_2\oplus Z_2)$ in a rather simple way. In this way the scalars or pseudoscalars are viewed as gauge fields along two directions in the space of one-forms on $Z_2\oplus Z_2$.
Source: http://arxiv.org/abs/hep-th/9411158v1
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We present the results obtained by the CDF and D0 collaborations on the extraction of the CKM matrix element Vtb, the $W$ helicity measurements, and the constraints obtained on the $Wtb$ vertex.
Source: http://arxiv.org/abs/1203.6802v1
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We study sequences $f_k:\Sigma_k \to \R^n$ of conformally immersed, compact Riemann surfaces with fixed genus and Willmore energy ${\cal W}(f) \leq \Lambda$. Assume that $\Sigma_k$ converges to $\Sigma$ in moduli space, i.e. $\phi_k^\ast(\Sigma_k) \to \Sigma$ as complex structures for diffeomorphisms $\phi_k$. Then we construct a branched conformal immersion $f:\Sigma \to \R^n$ and M\"obius transformations $\sigma_k$, such that for a subsequence $\sigma_k \circ f_k \circ \phi_k \to f$...
Source: http://arxiv.org/abs/1007.3967v2
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by Spenta R. Wadia
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We review the gauge invariant formulation of 2-dim. QCD. We show that the non-linear gauge invariant phase space is the coset $W_\infty/W_{+\infty}\times W_{-\infty}$ ,which is specified by the $N=\infty$ master-field of this model. The meson fields correspond to the local coordinates of the coset. We comment on the stringy collective coordinates of the solitons (baryons) in this model.
Source: http://arxiv.org/abs/hep-th/9411213v1
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by Ryuji KEMMOKU; Satoru SAITO; 13 pages; Latex
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It is shown that the $W_{1+\infty}$ algebra is nothing but the simplest subalgebra of a $q$-discretized \vi\ algebra, in the language of the KP hierarchy explicitly.
Source: http://arxiv.org/abs/hep-th/9411027v1
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We discuss how a large class of incompressible quantum Hall states can be characterized as highest weight states of different representations of the \Winf algebra. Second quantized expressions of the \Winf generators are explicitly derived in the cases of multilayer Hall states, the states proposed by Jain to explain the hierarchical filling fractions and the ones related by particle-hole conjugation.
Source: http://arxiv.org/abs/hep-th/9411082v1
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by G. Albertini; V. E. Korepin; A. Schadschneider
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We consider the limit of strong Coulomb attraction for generalized Hubbard models with $\eta$-symmetry. In this limit these models are equivalent to the ferromagnetic spin-1/2 Heisenberg quantum spin chain. In order to study the behaviour of the superconducting phase in the electronic model under perturbations which break the $\eta$-symmetry we investigate the ground state of the ferromagnetic non-critical $XXZ$-chain in the sector with fixed magnetization. It turns out to be a large bound...
Source: http://arxiv.org/abs/cond-mat/9411051v2
In our previous work, we identify the Sublattice-Pairing State (SPS) in Schwinger-fermion representation as the spin liquid phase discovered in recent numerical study on a honeycomb lattice. In this paper, we show that SPS is identical to the zero-flux $Z_2$ spin liquid in Schwinger-boson representation found by Wang\cite{Wang2010} by an explicit duality transformation. SPS is connected to an \emph{unusual} antiferromagnetic ordered phase, which we term as chiral-antiferromagnetic (CAF) phase,...
Source: http://arxiv.org/abs/1007.3266v2
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In this paper we propose an exactly soluble model in two-dimensional honeycomb lattice, from which two phases are found. One is the usual Chern/topological insulating state and the other is an interesting $Z_2$ fractionalized Chern/topological insulator. While their bulk properties are similar, the edge-states of physical electrons are quite different. The single electron excitation of the former shows a free particle-like behavior while the latter one is gapped, which provides a definite...
Source: http://arxiv.org/abs/1304.2099v3
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For the S-states of muonium and positronium, the hyperfine shifts to the order $\alpha^6$ of a recently derived two-fermion equation with explicit $\cal CPT$-invariance are checked against the results of a nonrelativistic reduction, and the leading $\alpha^8$ shifts are calculated. An additional hyperfine operator is discovered which can milden the singularity for $r\to 0$ of the Dirac hyperfine operator, such that the resulting extended operator can be used nonperturbatively. The binding...
Source: http://arxiv.org/abs/hep-ph/9910281v1
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by Indubala I Satija; Tomaz Prosen
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We investigate classical-quantum correspondence for kicked Harper model for extremely small values of the Planck constant $\hbar$. In the asymmetric case a pure quantum state shows clear signature of classical diffusive as well as super diffusive transitions asymptotically independent of $\hbar$. However, for the symmetric case, the $\hbar$ independent behavior occurs only for renormalized parameter $\bar{K}=K/(2\hbar)$ with intriguing features such as a sharp transition from integrable to...
Source: http://arxiv.org/abs/nlin/0107004v1
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by Anatolij Dvurečenskij
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We study $\mathbb H$-perfect pseudo MV-algebras, that is, algebras which can be split into a system of ordered slices indexed by the elements of an subgroup $\mathbb H$ of the group of the real numbers. We show when they can be represented as a lexicographic product of $\mathbb H$ with some $\ell$-group. In addition, we show also a categorical equivalence of this category with the category of $\ell$-groups.
Source: http://arxiv.org/abs/1304.0743v1
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by P. H. Chankowski; Z. Płuciennik; S. Pokorski
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We calculate ~$\sin^2\theta(M_Z)$ ~in the MSSM in terms of ~ $\alpha_{EM}$, ~$G_F$, ~$m_t$, ~$\tan\beta$ ~and SUSY mass parameters with the same accuracy as the present calculations of ~$\sin^2\theta(M_Z)$ ~in the SM. We compare the results with the standard leading logarithmic approximation used for SUSY threshold corrections and find important differences in the case of light sparticles. We give approximate formulae connecting coupling constants in the SM and in the MSSM and comment on...
Source: http://arxiv.org/abs/hep-ph/9411233v1
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We consider the problem of parameter estimation for a system of ordinary differential equations from noisy observations on a solution of the system. In case the system is nonlinear, as it typically is in practical applications, an analytic solution to it usually does not exist. Consequently, straightforward estimation methods like the ordinary least squares method depend on repetitive use of numerical integration in order to determine the solution of the system for each of the parameter values...
Source: http://arxiv.org/abs/1007.3880v3
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by William P. Ford; Sabine Jeschonnek; J. W. Van Orden
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In previous papers we have presented a calculation describing electrodisintegration of the deuteron at GeV energies. The model is fully relativistic and incorporates full spin dependence of the final state interactions (FSI), which were obtained from the SAID analysis. It was, however, limited kinematically due to lack of availability of the SAID amplitudes. This work rectifies this problem by implementing a Regge model to describe the FSI. We present an outline of the model and show...
Source: http://arxiv.org/abs/1304.0647v1
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by G. Papavassiliou; M. Pissas; M. Fardis; M. Karayanni; C. Christides
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The temperature dependence of the magnetic field distribution in the mixed superconducting phase of randomly oriented MgB$_2$ powder was probed by $% ^{11}$B NMR spectroscopy. Below the temperature of the second critical ($B_{% {c2}}$) field, $T_{{c2}}\approx 27$K, our spectra reveal two NMR signal components, one mapping the magnetic field distribution in the mixed superconducting state and the other one arising from the normal state. The complementary use of bulk magnetization and NMR...
Source: http://arxiv.org/abs/cond-mat/0107511v1
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by N. B. Ladygina
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The $dd\to ^3He n$ reaction is considered at the energies between 200 MeV and 520 MeV. The Alt-Grassberger-Sandhas equations are iterated up to the lowest order terms over the nucleon-nucleon t-matrix. The parameterized ${^3He}$ wave function including five components is used. The angular dependence of the differential cross section and energy dependence of tensor analyzing power $T_{20}$ at the zero scattering angle are presented in comparison with the experimental data.
Source: http://arxiv.org/abs/1203.4678v1
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by D. V. Shirkov; I. L. Solovtsov
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We begin with short review of the analytic approach (AA) to QCD recently developed and applied to the process of $e^+e^-$ annihilation into hadrons at low energies. Besides summary of the theoretical description of smeared experimental data for the $R$ cross-section ratio we give fresh analogous result for the corresponding Adler function, $D(Q^2)$, and demonstrate excellent agreement between the AA theoretical results and data in the low $Q^2$ region.
Source: http://arxiv.org/abs/hep-ph/9906495v1
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The $f(R)$ gravity models formulated in Einstein conformal frame are equivalent to Einstein gravity together with a minimally coupled scalar field. We shall explore phantom behavior of $f(R)$ models in this frame and compare the results with those of the usual notion of phantom scalar field.
Source: http://arxiv.org/abs/1005.5679v2
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We describe $k$-MLE, a fast and efficient local search algorithm for learning finite statistical mixtures of exponential families such as Gaussian mixture models. Mixture models are traditionally learned using the expectation-maximization (EM) soft clustering technique that monotonically increases the incomplete (expected complete) likelihood. Given prescribed mixture weights, the hard clustering $k$-MLE algorithm iteratively assigns data to the most likely weighted component and update the...
Source: http://arxiv.org/abs/1203.5181v1
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The semiclassical limit of the algebraic Bethe Ansatz method is used to solve the theory of Gaudin models for the $sl(2|1)^{(2)}$ R-matrix. We find the spectra and eigenvectors of the $N-1$ independents Gaudin Hamiltonians. We also use the off-shell Bethe Ansatz method to show how the off-shell Gaudin equation solves the associated trigonometric system of Knizhnik-Zamolodchikov equations.
Source: http://arxiv.org/abs/nlin/0406025v1
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Graphite oxide is an amorphous insulator. Although several models have been suggested, its structure remains controversial. To elucidate this issue, 5 samples were prepared by the Brodie process and the Staudenmaier process. The electronic structure of graphite oxide was examined with x-ray absorption near edge structure and the ratio of $sp^{2}$ to $sp^{3}$ bonded carbon atoms was investigated with x-ray photoemission spectroscopy as a function of sample preparation times. It was found that...
Source: http://arxiv.org/abs/1007.0287v2
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The cross section near the $t\bar t$ production threshold in $e^+e^-$ annihilation and $\gamma\gamma$ collisions is discussed. The NNLO results within NRQCD are briefly overviewed.
Source: http://arxiv.org/abs/hep-ph/0009036v1
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by Jian Jun Liu; Chong Sheng Li; Li Lin Yang; Li Gang Jin
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We recalculate the branching ratios for $t\to cV$ ($V=g,\gamma,Z$) induced by SUSY FCNC couplings within the general unconstrained MSSM framework using mass eigenstate approach. Our results show that the branching ratios for these decays are larger than ones reported in previous literatures in the MSSM with R-parity conservation, and they can reach $\sim 10^{-4}$, $\sim 10^{-6}$, and $\sim 10^{-6}$, respectively, for favorable parameter values allowed by current precise experiments. Thus, the...
Source: http://arxiv.org/abs/hep-ph/0406155v3
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We perform a $1/m_b$ and $1/m_t$ expansion of the Cabibbo-Kobayashi- Maskawa mixing matrix. Data suggest that the dominant parts of the Yukawa couplings are factorizable into sets of numbers $\vert r>$, $\vert s>$, and $\vert s'>$, associated, respectively, with the left-handed doublets, the right-handed up singlets, and the right- handed down singlets. The first order expansion is consistent with Wolfenstein parameterization, which is an expansion in $sin \theta _c$ to third order....
Source: http://arxiv.org/abs/hep-ph/9411292v2
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In this contribution the first next-to-next-to-leading order corrections to the branching ratio ${BR}(\bar{B}\to X_s\gamma)$ are discussed. This includes the completion of the matching part and the fermionic corrections to the most important operator matrix elements.
Source: http://arxiv.org/abs/hep-ph/0406240v1
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by Evgeny Feigin
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Let $\Fl_\lambda$ be a generalized flag variety of a simple Lie group $G$ embedded into the projectivization of an irreducible $G$-module $V_\lambda$. We define a flat degeneration $\Fl_\lambda^a$, which is a ${\mathbb G}^M_a$ variety. Moreover, there exists a larger group $G^a$ acting on $\Fl_\lambda^a$, which is a degeneration of the group $G$. The group $G^a$ contains ${\mathbb G}^M_a$ as a normal subgroup. If $G$ is of type $A$, then the degenerate flag varieties can be embedded into the...
Source: http://arxiv.org/abs/1007.0646v2
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by Ulrich Bunke; Martin Olbrich
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We propose a new method for studying $n$- and $\Gamma$-cohomology of globalizations of Harish-Chandra modules, where $G=KAN$ is a rank one semisimple Lie group, $\Gamma$ is a discrete subgroup of $G$ and $n=Lie(N)$. We prove a conjecture of Patterson relating the singularities of Selberg zeta functions with the $\Gamma$-cohomology of principal series representations if $\Gamma$ is cocompact and torsion free.
Source: http://arxiv.org/abs/dg-ga/9411004v1
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by Ovidiu Savin; Enrico Valdinoci
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We discuss the $\Gamma$-convergence, under the appropriate scaling, of the energy functional $$ \|u\|_{H^s(\Omega)}^2+\int_\Omega W(u)dx,$$ with $s \in (0,1)$, where $\|u\|_{H^s(\Omega)}$ denotes the total contribution from $\Omega$ in the $H^s$ norm of $u$, and $W$ is a double-well potential. When $s\in [1/2,\,1)$, we show that the energy $\Gamma$-converges to the classical minimal surface functional -- while, when $s\in(0,\,1/2)$, it is easy to see that the functional $\Gamma$-converges to...
Source: http://arxiv.org/abs/1007.1725v3
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A complete realistic study of $_\Lambda ^5$He hypernucleus is presented using a realistic Hamiltonian and wave function. This study takes into account all relevant dynamical correlations along with $\Lambda N$ space-exchange correlation (SEC). We also compute $\Lambda NN$ force and the corelation induced by this force. The SEC affects the central repulsive $\lambda N$ correlation significantly at $r \le 2.0$ fm, specially at its peak and in its vicinity. SEC significantly affects energy...
Source: http://arxiv.org/abs/nucl-th/0406063v1
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by Y. Yamamoto; T. Tamagawa; T. Fukuda; T. Motoba
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$\Xi^-$ escaping and scattering probabilities in the $(K^-,K^+)$ reaction with nuclear targets is investigated on the basis of the eikonal approximation. Calculations are performed using the $S=-2$ sector of the Nijmegen model-D interaction, whose hard core radii are treated phenomenologically. %The $\Xi^- N$, $\Xi^- p$ and $\Xi^- n$ elastic cross sections are The $\Xi^- N$ elastic cross sections are derived from the $^9$Be$(K^-,K^+)$ data of the BNL-E906 experiment, which is useful to...
Source: http://arxiv.org/abs/nucl-th/0107049v1
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by Taiichi Yamada; Yasuro Funaki
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The structure of $3/2^{-}$ and $1/2^{+}$ states in $^{11}$B is investigated with an $\alpha+\alpha+t$ orthogonality condition model (OCM) based on the Gaussian expansion method. Full levels up to the $3/2^{-}_{3}$ and $1/2^{+}_2$ states around the $\alpha+\alpha+t$ threshold ($E_x$=11.1 MeV) are reproduced consistently with the experimental energy levels. It is shown that the $3/2_{3}^{-}$ state located around the $^{7}$Li+$\alpha$ threshold has an $\alpha+\alpha+t$ cluster structure, whereas...
Source: http://arxiv.org/abs/1007.4125v1
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by H. L. Crawford; R. V. F. Janssens; P. F. Mantica; J. S. Berryman; R. Broda; M. P. Carpenter; N. Cieplicka; B. Fornal; G. F. Grinyer; N. Hoteling; B. P. Kay; T. Lauritsen; K. Minamisono; I. Stefanescu; J. B. Stoker; W. B. Walters; S. Zhu
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The isomeric and $\beta$-decay properties of neutron-rich $^{53-57}$Sc and $^{53,54}$Ca nuclei near neutron number $N$=32 are reported, and the low-energy level schemes of $^{53,54,56}$Sc and $^{53-57}$Ti are presented. The low-energy level structures of the $_{21}$Sc isotopes are discussed in terms of the coupling of the valence $1f_{7/2}$ proton to states in the corresponding $_{20}$Ca cores. Implications with respect to the robustness of the $N$=32 subshell closure are discussed, as well as...
Source: http://arxiv.org/abs/1007.0032v1
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by Roger W. Romani; I. -A. Yadigaroglu
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There are now a half dozen young pulsars detected in high energy photons by the Compton GRO, showing a variety of emission efficiencies and pulse profiles. We present here a calculation of the pattern of high energy emission on the sky in a model which posits $\gamma$-ray production by charge depleted gaps in the outer magnetosphere. This model accounts for the radio to $\gamma$-ray pulse offsets of the known pulsars, as well as the shape of the high energy pulse profiles. We also show that...
Source: http://arxiv.org/abs/astro-ph/9401045v1
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by Y. Zheng; G. de France; E. Clément; A. Dijon; B. Cederwall; R. Wadsworth; T. Bäck; F. Ghazi Moradi; G. Jaworski; B. M. Nyakó; J. Nyberg; M. Palacz; H. Al-Azri; G. de Angelis; A. Atac; Ö. Aktaş; S. Bhattacharyya; T. Brock; P. J. Davies; A. Di Nitto; Zs. Dombradi; A. Gadea; J. Gal; P. Joshi; K. Juhasz; R. Julin; A. Jungclaus; G. Kalinka; J. Kownacki; G. La Rana; S. M. Lenzi; J. Molnar; R. Moro; D. R. Napoli; B. S. Nara Singh; A. Persson; F. Recchia; M. Sandzelius; J. -N. Scheurer; G....
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Linear polarization measurements have been performed for $\gamma$-rays in $^{91}$Ru produced with the $^{58}$Ni($^{36}$Ar, $2p1n$$\gamma$)$^{91}$Ru reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the $\gamma$-$\gamma$ coincidences, $\gamma$-ray linear polarization and $\gamma$-ray angular distributions. The polarization sensitivity of the EXOGAM clover detectors acting as Compton polarimeters has been determined in the energy range 0.3$-$1.3 MeV....
Source: http://arxiv.org/abs/1304.3287v1
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by Jochen Bartels; Michael Lublinsky
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We summarize the results on the high energy behavior of quark-antiquark exchange in $\gamma^* \gamma^*$ elastic scattering. The ladder diagrams, summed in the double logarithmic approximation, provide a perturbative QCD model for secondary reggeon exchange.
Source: http://arxiv.org/abs/hep-ph/0406273v1
Using a cohomological characterization of the consistent and the covariant Lorentz and gauge anomalies, derived from the complexification of the relevant algebras, we study in $d=2$ the definition of the Weyl determinant for a non-abelian theory with Riemannian background. We obtain two second order operators that produce, by means of $\zeta$-function regularization, respectively the consistent and the covariant Lorentz and gauge anomalies, preserving diffeomorphism invariance. We compute...
Source: http://arxiv.org/abs/hep-th/9411132v1
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A chiral constituent quark model approach, embodying s- and u-channel exchanges,complemented with a Reggeized treatment for t-channel is presented. A model is obtained allowing data for $\pi^- p \to \eta n$ and $\gamma p \to \eta p$ to be describe satisfactorily. For the latter reaction, recently released data by CLAS and CBELSA/TAPS Collaborations in the system total energy range $1.6 \lesssim W \lesssim 2.8$ GeV are well reproduced due to the inclusion of Reggeized trajectories instead of...
Source: http://arxiv.org/abs/1005.2797v2
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by P. Kosi{ń}ski; J. Lukierski; P. Ma{ś}lanka; J. Sobczyk
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The $\kappa$-deformed $D=4$ Poincar{\'e} superalgebra written in Hopf superalgebra form is transformed to the basis with classical Lorentz subalgebra generators. We show that in such a basis the $\kappa$-deformed $D=4$ Poincare superalgebra can be written as graded bicrossproduct. We show that the $\kappa$-deformed $D=4$ superalgebra acts covariantly on $\kappa$-deformed chiral superspace.
Source: http://arxiv.org/abs/hep-th/9411115v1