id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
|---|---|---|---|---|---|---|
hep-th/9203055 | Interacting Euclidean 3D Quantum Gravity | We show that Euclidean 3D-gravity coupled to a Gaussian scalar massive matter
field in first-order dreibein formalism gives a quantum theory which has a
finite perturbative expansion around a non-vanishing background. We also
discuss a possible mechanism to generate a non-trivial background metric
starting from Rovelli... | 1992-03-20 | 2014-11-18 | [
"hep-th"
] | G.Bonacina, A.Gamba and M.Martellini |
hep-th/9203054 | Hawking Radiation and Back-Reaction | The puzzles of black hole evaporation can be studied in the simplified
context of 1+1 dimensional gravity. The semi-classical equations of Callan,
Giddings, Harvey and Strominger provide a consistent description of the
evaporation process which we describe in detail. We consider the possibility
that black hole evolutio... | 1992-03-20 | 2008-11-26 | [
"hep-th"
] | L. Susskind and L. Thorlacius |
hep-th/9203056 | Gauge Invariant Formulations of Lineal Gravity | It is shown that the currently studied ``string-inspired'' model for gravity
on a line can be formulated as a gauge invariant theory based on the Poincar\'e
group with central extension -- a formulation that complements and simplifies
H.~Verlinde's construction based on the unextended Poincar\'e group. | 1992-03-20 | 2009-10-22 | [
"hep-th"
] | Daniel Cangemi and Roman Jackiw |
hep-th/9203053 | Combinatorial and topological phase structure of non-perturbative
n-dimensional quantum gravity | We provide a non-perturbative geometrical characterization of the partition
function of $n$-dimensional quantum gravity based on a coarse classification of
riemannian geometries. We show that, under natural geometrical constraints, the
theory admits a continuum limit with a non-trivial phase structure parametrized
by t... | 1992-03-19 | 2014-11-18 | [
"hep-th"
] | M.Carfora, M.Martellini and A.Marzuoli |
hep-th/9203052 | Evaporation of Two Dimensional Black Holes | Callan, Giddings, Harvey and Strominger have proposed an interesting two
dimensional model theory that allows one to consider black hole evaporation in
the semi-classical approximation. They originally hoped the black hole would
evaporate completely without a singularity. However, it has been shown that the
semi-classi... | 1992-03-18 | 2010-11-01 | [
"hep-th"
] | S. W. Hawking |
hep-th/9203051 | A twistor-like D=10 superparticle action with manifest N=8 world-line
supersymmetry | We propose a new formulation of the $D=10$ Brink-Schwarz superparticle which
is manifestly invariant under both the target-space super-Poincar\'e group and
the world-line local $N=8$ superconformal group. This twistor-like construction
naturally involves the sphere $S^8$ as a coset space of the $D=10$ Lorentz
group. Th... | 1992-03-18 | 2009-10-22 | [
"hep-th"
] | A.Galperin and E.Sokatchev |
hep-th/9203043 | Generalized Kontsevich Model Versus Toda Hierarchy and Discrete Matrix
Models | We represent the partition function of the Generalized Kontsevich Model (GKM)
in the form of a Toda lattice $\tau$-function and discuss various implications
of non-vanishing "negative"- and "zero"-time variables: the appear to modify
the original GKM action by negative-power and logarithmic contributions
respectively. ... | 1992-03-18 | 2009-10-22 | [
"hep-th"
] | S.Kharchev, A.Marshakov, A.Mironov, A.Morozov |
hep-th/9203044 | $c = r_g$ Theories of $W_G$-Gravity: The Set of Observables as a Model
of Simply Laced $G$ | We propose to study a generalization of the Klebanov-Polyakov-Witten (KPW)
construction for the algebra of observables in the $c = 1$ string model to
theories with $c > 1$. We emphasize the algebraic meaning of the KPW
construction for $c = 1$ related to occurrence of a {\it model} of {\it SU}(2)
as original structure ... | 1992-03-18 | 2009-10-22 | [
"hep-th"
] | A.Marshakov, A.Mironov, A.Morozov, M.Olshanetsky |
hep-th/9203050 | The Causal Structure of Two-Dimensional Spacetimes | We investigate the causal structure of $(1+1)$-dimensional spacetimes. For
two sets of field equations we show that at least locally any spacetime is a
solution for an appropriate choice of the matter fields. For the theories under
consideration we investigate how smoothness of their black hole solutions
affects time o... | 1992-03-18 | 2010-04-06 | [
"hep-th"
] | Dan Christensen and Robert B. Mann |
hep-th/9203049 | Path-Integral Measure of Linearized Gravity in Curved Spacetime | The path-integral measure of linearized gravity around a saddle-point
background with the cosmological term is considered in order to study the
conformal rotation prescription proposed by Gibbons, Hawking and Perry. It is
also argued that the most generally used measure, i.e., the covariant
path-integral measure, does ... | 1992-03-18 | 2008-02-03 | [
"hep-th"
] | Hiroki Fukutaka |
hep-th/9203045 | Results of the classification of superconformal algebras in two
dimensions | A list of superconformal chiral operator product expansion algebras with
quadratic nonlinearity in two dimensions is completed on the basis of the known
classification of little conformal Lie superalgebras. In addition to the
previously known cases and the constructed in our previous paper exceptional
$N=8$ superalgebr... | 1992-03-18 | 2009-10-22 | [
"hep-th"
] | E.S. Fradkin and V.Ya Linetsky |
hep-th/9203048 | Quantum Galilei Group as Symmetry of Magnons | Inhomogeneous quantum groups are shown to be an effective algebraic tool in
the study of integrable systems and to provide solutions equivalent to the
Bethe ansatz. The method is illustrated on the 1D Heisenberg ferromagnet whose
symmetry is shown to be the quantum Galilei group Gamma_q(1) here introduced.
Both the sin... | 1992-03-18 | 2009-10-22 | [
"hep-th"
] | F.Bonechi, E.Celeghini, R.Giachetti, E.Sorace and M.Tarlini |
hep-th/9203042 | Quantum Black Holes | Static solutions of large-$N$ quantum dilaton gravity in $1+1$ dimensions are
analyzed and found to exhibit some unusual behavior. As expected from previous
work, infinite-mass solutions are found describing a black hole in equilibrium
with a bath of Hawking radiation. Surprisingly, the finite mass solutions are
found ... | 1992-03-18 | 2009-09-17 | [
"hep-th"
] | B. Birnir, S.B. Giddings, J.A. Harvey, and A. Strominger |
hep-th/9203040 | How the Jones Polynomial Gives Rise to Physical States of Quantum
General Relativity | Solutions to both the diffeomorphism and the hamiltonian constraint of
quantum gravity have been found in the loop representation, which is based on
Ashtekar's new variables. While the diffeomorphism constraint is easily solved
by considering loop functionals which are knot invariants, there remains the
puzzle why seve... | 1992-03-17 | 2008-11-26 | [
"hep-th"
] | Bernd Bruegmann, Rodolfo Gambini, Jorge Pullin |
hep-th/9203046 | Quantum symmetries in discrete gauge theories | We analyse the fusion, braiding and scattering properties of discrete
non-abelian anyons. These occur in (2+1)-dimensional theories where a gauge
group G is spontaneously broken down to some discrete subgroup H. We identify
the quantumnumbers of the electrically and magnetically charged sectors of the
remaining discret... | 1992-03-17 | 2009-10-22 | [
"hep-th"
] | F.Alexander Bais, Peter van Driel and Mark de Wild Propitius |
hep-th/9203047 | Anyons in discrete gauge theories with Chern-Simons terms | We study the effect of a Chern-Simons term in a theory with discrete gauge
group H, which in (2+1)-dimensional space time describes (non-abelian) anyons.
As in a previous paper, we emphasize the underlying algebraic structure, namely
the Hopf algebra D(H). We argue on physical grounds that the addition of a
Chern-Simon... | 1992-03-17 | 2015-06-26 | [
"hep-th"
] | F.Alexander Bais, Peter van Driel and Mark de Wild Propitius |
hep-th/9203039 | Black Holes from Non-Abelian Toda Theories | NON-ABELIAN TODA THEORIES are shown to provide EXACTLY SOLVABLE conformal
systems in the presence of a BLACK HOLE which may be regarded as describing a
string propagating in target space with a black-hole metric. These theories are
associated with non-canonical $\bf Z$-gradations of simple algebras, where the
gradation... | 1992-03-17 | 2009-10-22 | [
"hep-th"
] | Jean-Loup Gervais and Mikhail V. Saveliev |
hep-th/9203041 | Extremal variety as the foundation of a cosmological quantum theory | Dynamical systems of a new kind are described, which are motivated by the
problem of constructing diffeomorphism invariant quantum theories. These are
based on the extremization of a non-local and non-additive quantity that we
call the variety of a system. In these systems all dynaqmical variables refer
to relative coo... | 1992-03-17 | 2007-05-23 | [
"hep-th"
] | Julian Barbour and Lee Smolin |
hep-th/9203038 | Nonlocal regularisation and two-dimensional induced actions | We present an invariant regularisation scheme to compute two dimensional
induced gauge theory actions, that is local in Polyakov's variables, but
nonlocal in the original gauge potentials. Our method sheds light on the
locality of this induced action, and leads to a straightforward proof that the
$\varepsilon$-anomaly ... | 1992-03-14 | 2009-10-22 | [
"hep-th"
] | F. De Jonghe, R. Siebelink and W. Troost |
hep-th/9203036 | On the quantization of the N=2 supersymmetric non linear sigma model | A method for quantizing the bidimensional N=2 supersymmetric non-linear sigma
model is developed. This method is both covariant under coordinate
transformations (concerning the order relevant for calculations) and explicitly
N=2 supersymmetric. The OPE of the supercurrent is computed accordingly,
including also the dil... | 1992-03-13 | 2015-06-26 | [
"hep-th"
] | G.Aldazabal, J.M.Maldacena |
hep-th/9203037 | R-matrices for the semicyclic representations of U_q sl^(2) | R-matrices for the semicyclic representations of U_qsl^(2) are found as a
limit in the checkerboard chiral Potts model. | 1992-03-13 | 2009-10-22 | [
"hep-th",
"math.QA",
"nlin.SI",
"solv-int"
] | I. T. Ivanov and D. B. Uglov (SUNY Stony Brook) |
hep-th/9203035 | New Integrable Deformations of Higher Spin Heisenberg-Ising Chains | We show that the anisotropic Heisenberg-Ising chains with higher spin allow,
for special values of the anisotropy, integrable deformations intimately
related to the theory of quantum groups at roots of unity. For the spin one
case we construct and study the symmetries of the hamiltonian which depends on
a spectral vari... | 1992-03-12 | 2009-10-22 | [
"hep-th"
] | C. Gomez, G. Sierra |
hep-th/9203033 | Cosmological solutions with dilaton and maximally symmetric space in
string theory | We discuss time - dependent solutions of the leading order string effective
equations for a non-zero central charge deficit and curved maximally symmetric
space. Some regular solutions are found for the case of non-trivial
antisymmetric tensor and vector backgrounds (in various dimensions) and
negative spatial curvatur... | 1992-03-12 | 2009-09-17 | [
"hep-th"
] | A.A. Tseytlin |
hep-th/9203034 | Volume-preserving diffeomorphisms in integrable deformations of selfdual
gravity | A group of volume-preserving diffeomorphisms in 3D turns out to play a key
role in an Einstein-Maxwell theory whose Weyl tensor is selfdual and whose
Maxwell tensor has algebraically general anti-selfdual part. This model was
first introduced by Flaherty and recently studied by Park as an integrable
deformation of self... | 1992-03-12 | 2009-10-22 | [
"hep-th"
] | Kanehisa Takasaki |
hep-th/9203031 | Two Dimensional Stringy Black Holes with One Asymptotically Flat Domain | The exact black hole solution of 2D closed string theory has, as any other
maximally extended Schwarzschild-like geometry, two asymptotically flat
spacetime domains. One can get rid of the second domain by gauging the discrete
symmetry on the SL(2,R)/U(1) coset that interchanges the two asymptotic domains
and preserves... | 1992-03-11 | 2009-10-22 | [
"hep-th"
] | Petr Horava |
hep-th/9203032 | Relating Scattering Amplitudes in Bosonic and Topological String
Theories | A formal relationship between scattering amplitudes in critical bosonic
string theory and correlation functions of operators in topological string
theory is found. | 1992-03-11 | 2016-09-06 | [
"hep-th"
] | Roger Brooks |
hep-th/9203026 | The Mathai-Quillen Formalism and Topological Field Theory | These lecture notes give an introductory account of an approach to
cohomological field theory due to Atiyah and Jeffrey which is based on the
construction of Gaussian shaped Thom forms by Mathai and Quillen. Topics
covered are: an explanation of the Mathai-Quillen formalism for finite
dimensional vector bundles; the de... | 1992-03-10 | 2009-10-22 | [
"hep-th",
"math.QA"
] | M. Blau |
hep-th/9203028 | A note on the Zakharov-Shabat topological model | In this note I discuss some features of the topological theory obtained from
the Zakharov-Shabat (or general sl(2,C)) hierarchy, and comment on some
possible physical and/or mathematical interpretations of it. | 1992-03-10 | 2015-06-26 | [
"hep-th"
] | Andrea Pasquinucci |
hep-th/9203029 | Canonical Quantization of $(2+1)$ Dimensional Qed with Topological Mass
Term | We discuss the canonical quantization of Quantum Electrodynamics in $2+1$
dimensions, with a Chern-Simons topological mass term and gauge-covariant
coupling to a Dirac spinor field. A gauge-fixing term is used which generates a
canonical momentum for $A_0$, so that there are no primary constraints on
operator-valued fi... | 1992-03-10 | 2009-10-22 | [
"hep-th"
] | Kurt Haller and Edwin Lombridas |
hep-th/9203027 | Altering the Symmetry of Wavefunctions in Quantum Algebras and
Supersymmetry | The statistics-altering operators present in the limit $q=-1$ of
multiparticle SU_q(2)-invariant subspaces parallel the action of such operators
which naturally occur in supersymmetric theories. We illustrate this
heuristically by comparison to a toy $N=2$ superymmetry algebra, and ask
whether there is a supersymmetry ... | 1992-03-10 | 2009-10-02 | [
"hep-th"
] | C.K. Zachos |
hep-th/9203030 | Multicritical Phases of the O(n) Model on a Random Lattice | We exhibit the multicritical phase structure of the loop gas model on a
random surface. The dense phase is reconsidered, with special attention paid to
the topological points $g=1/p$. This phase is complementary to the dilute and
higher multicritical phases in the sense that dense models contain the same
spectrum of bu... | 1992-03-10 | 2009-10-22 | [
"hep-th"
] | Ivan K. Kostov and Matthias Staudacher |
hep-th/9203024 | New Realisations of W Algebras and W Strings | We discuss new realisations of $W$ algebras in which the currents are
expressed in terms of two arbitrary commuting energy-momentum tensors together
with a set of free scalar fields. This contrasts with the previously-known
realisations, which involve only one energy-momentum tensor. Since realisations
of non-linear al... | 1992-03-09 | 2009-10-07 | [
"hep-th"
] | H. Lu, C.N. Pope, S. Schrans and X.J. Wang |
hep-th/9203023 | Semilocal strings and monopoles | A variation on the abelian Higgs model, with global SU(2) x local U(1)
symmetry broken to global U(1) was recently shown by Vachaspati and Achucarro
to admit stable, finite energy cosmic string solutions even though the manifold
of minima of the potential energy does not have non-contractible loops. Here
the most gener... | 1992-03-09 | 2009-10-07 | [
"hep-th"
] | G.W. Gibbons, M.E. Ortiz, F. Ruiz Ruiz and T.M. Samols |
hep-th/9203020 | The Extension Structure of 2D Massive Current Algebras | The extension structure of the 2-dimensional current algebra of non-linear
sigma models is analysed by introducing Kostant Sternberg $(L,M)$ systems. It
is found that the algebra obeys a two step extension by abelian ideals. The
second step is a non-split extension of a representation of the quotient of the
algebra by ... | 1992-03-09 | 2015-06-26 | [
"hep-th"
] | J. Laartz |
hep-th/9203019 | The Weingarten Model a la Polyakov | The Weingarten lattice gauge model of Nambu-Goto strings is generalised to
allow for fluctuations of an intrinsic worldsheet metric through a dynamical
quadrilation. The continuum limit is taken for $c\leq1$ matter, reproducing the
results of hermitian matrix models to all orders in the genus expansion. For
the compact... | 1992-03-09 | 2015-06-26 | [
"hep-th"
] | S.Dalley |
hep-th/9203025 | The Search for a realistic flipped SU(5) string model | We present an extensive search for a general class of flipped $SU(5)$ models
built within the free fermionic formulation of the heterotic string. We
describe a set of algorithms which constitute the basis for a computer program
capable of generating systematically the massless spectrum and the
superpotential of all pos... | 1992-03-09 | 2009-10-22 | [
"hep-th"
] | J. Lopez, D. Nanopoulos, and K. Yuan |
hep-th/9203022 | Stable Non--Perturbative Minimal Models Coupled to 2D Quantum Gravity | A generalisation of the non--perturbatively stable solutions of string
equations which respect the KdV flows, obtained recently for the $(2m-1,2)$
conformal minimal models coupled to two--dimensional quantum gravity, is
presented for the $(p,q)$ models. These string equations are the most general
string equations compa... | 1992-03-09 | 2009-10-22 | [
"hep-th"
] | Clifford Johnson, Tim Morris and Bill Spence |
hep-th/9203021 | Covariant Currents in N=2 Super-Liouville Theory | Based on a path integral prescription for anomaly calculation, we analyze an
effective theory of the two-dimensional $N=2$ supergravity, i.e., $N=2$
super-Liouville theory. We calculate the anomalies associated with the BRST
supercurrent and the ghost number supercurrent. From those expressions of
anomalies, we constru... | 1992-03-09 | 2009-10-22 | [
"hep-th"
] | Joaquim Gomis and Hiroshi Suzuki |
hep-th/9203018 | Supersymmetric, cold and lukewarm black holes in cosmological
Einstein-Maxwell theory | In flat space, the extreme Reissner-Nordstr\o m (RN) black hole is
distinguished by its coldness (vanishing Hawking temperature) and its
supersymmetry. We examine RN solutions to Einstein-Maxwell theory with a
cosmological constant $\Lambda$, classifying the cold black holes and, for
positive $\Lambda$, the ``lukewarm"... | 1992-03-08 | 2009-10-22 | [
"hep-th"
] | L. J. Romans |
hep-th/9203017 | Current algebras and light-cone quantization in 3+1 dimensions | A polarization of the Lie algebras $Map(C, G)$ of gauge transformations on
the light-cone $C\subset\RM^4$ is introduced, using splitting of the initial
data on $C$ for the wave operator to positive and negative frequencies. This
generalizes the usual polarization of affine Kac-Moody algebras to positive and
negative fr... | 1992-03-07 | 2007-05-23 | [
"hep-th"
] | Jouko Mickelsson |
hep-th/9203016 | Nonlocal Yang-Mills | We present a very simple and explicit procedure for nonlocalizing the action
of any theory which can be formulated perturbatively. When the resulting
nonlocal field theory is quantized using the functional formalism --- with unit
measure factor --- its Green's functions are finite to all orders. The
construction also e... | 1992-03-07 | 2009-10-22 | [
"hep-th"
] | Gary Kleppe and R. P. Woodard |
hep-th/9203014 | Brst Cohomology and Invariants of 4D Gravity in Ashtekar Variables | We discuss the BRST cohomologies of the invariants associated with the
description of classical and quantum gravity in four dimensions, using the
Ashtekar variables. These invariants are constructed from several BRST
cohomology sequences. They provide a systematic and clear characterization of
non-local observables in ... | 1992-03-06 | 2009-10-22 | [
"hep-th"
] | Lay Nam Chang and Chopin Soo |
hep-th/9203015 | Chiral Current Algebras in Three--Dimensional Bf--Theory with Boundary | We consider the three--dimensional BF--model with planar boundary in the
axial gauge. We find two--dimensional conserved chiral currents living on the
boundary and satisfying Kac--Moody algebras. | 1992-03-06 | 2007-05-23 | [
"hep-th"
] | Nicola Maggiore and Paolo Provero |
hep-th/9203012 | Measuring the $W$-hair of String Black Holes | We have argued previously that the infinitely many gauge symmetries of string
theory provide an infinite set of conserved (gauge) quantum numbers ($W$-hair)
which characterise black hole states and maintain quantum coherence. Here we
study ways of measuring the $W$-hair of spherically-symmetric four-dimensional
objects... | 1992-03-05 | 2009-09-11 | [
"hep-th"
] | John Ellis, N.E. Mavromatos and D.V. Nanopoulos |
hep-th/9203009 | Higher Genus Correlators from the Hermitian One-Matrix Model | We develop an iterative algorithm for the genus expansion of the hermitian
$N\times N$ one-matrix model ( = the Penner model in an external field). By
introducing moments of the external field, we prove that the genus $g$
contribution to the $m$-loop correlator depends only on $3g-2+m$ lower moments
($3g-2$ for the par... | 1992-03-04 | 2009-10-22 | [
"hep-th"
] | J. Ambjorn, L. Chekhov and Yu. Makeenko |
hep-th/9203010 | On The Interpolating Solutions of Strings in Different Backgrounds | We analyze the beta-function equations for string theory in the case when the
target space has one spacelike (or timelike) direction and rest is some
conformal field theory (CFT) with appropriate central charge and has one nearly
marginal operator. We show there always exists a space (time) dependent
solution which int... | 1992-03-04 | 2015-06-26 | [
"hep-th"
] | Sudipta Mukherji |
hep-th/9203011 | Fusion Rules and R-Matrices For Representations of $SL(2)_q$ at Roots of
Unity | We recall the classification of the irreducible representations of $SL(2)_q$,
and then give fusion rules for these representations. We also consider the
problem of $\cR$-matrices, intertwiners of the differently ordered tensor
products of these representations, and satisfying altogether Yang--Baxter
equations. | 1992-03-04 | 2008-02-03 | [
"hep-th",
"math.QA"
] | Daniel Arnaudon |
hep-th/9203007 | No-Boundary Theta-Sectors in Spatially Flat Quantum Cosmology | Gravitational theta-sectors are investigated in spatially locally homogeneous
cosmological models with flat closed spatial surfaces in 2+1 and 3+1 spacetime
dimensions. The metric ansatz is kept in its most general form compatible with
Hamiltonian minisuperspace dynamics. Nontrivial theta-sectors admitting a
semiclassi... | 1992-03-03 | 2009-10-22 | [
"hep-th"
] | Domenico Giulini and Jorma Louko |
hep-th/9203006 | Mtric from Non-Metric Action of Gravity | The action of general relativity proposed by Capovilla, Jacobson and Dell is
written in terms of $SO(3)$ gauge fields and gives Ashtekar's constraints for
Einstein gravity. However, it does not depend on the space-time metric nor its
signature explicitly. We discuss how the space-time metric is introduced from
algebrai... | 1992-03-03 | 2010-11-01 | [
"hep-th"
] | Kiyoshi Kamimura, Sinobu Makita and Takeshi Fukuyama |
hep-th/9203008 | Gauge Symmetries of the N=2 String | We study the underlying gauge symmetry algebra of the $N=2$ string, which is
broken down to a subalgebra in any spacetime background. For given toroidal
backgrounds, the unbroken gauge symmetries (corresponding to holomorphic and
antiholomorphic worldsheet currents) generate area-preserving diffeomorphism
algebras of n... | 1992-03-03 | 2010-11-01 | [
"hep-th"
] | Amit Giveon and Alfred Shapere |
hep-th/9203003 | The Sub-leading Magnetic Deformation of the Tricritical Ising Model in
2D as RSOS Restriction of the Izergin-Korepin Model | We compute the $S$-matrix of the Tricritical Ising Model perturbed by the
subleading magnetic operator using Smirnov's RSOS reduction of the
Izergin-Korepin model. We discuss some features of the scattering theory we
obtain, in particular a non trivial implementation of crossing-symmetry,
interesting connections betwee... | 1992-03-02 | 2009-10-22 | [
"hep-th"
] | F. Colomo, A. Koubek, G. Mussardo |
hep-th/9203013 | Is the $O(3)~\sigma$ Model with the Hopf Term Exactly Equivalent to a
Higher Spin Theory? | We write down a local $CP_1$ model involving two gauge fields, which is
exactly equivalent to the O(3) $\sigma$ model with the Hopf term. We impose the
$CP_1$ constraint by using the gaussian representation of the delta function.
For the coefficient of the Hopf term, $\theta = {\pi \over 2s}$, 2s being an
integer, we s... | 1992-03-02 | 2009-10-22 | [
"hep-th"
] | T.R.Govindarajan, R.Shankar, N.Shaji and M.Sivakumar |
hep-th/9203002 | Disk Amplitudes in Two-Dimensional Open String Theories | Disk amplitudes of tachyons in two-dimensional open string theories
(two-dimensional quantum gravity coupled to $c \leq 1$ conformal field
theories) are obtained using the continuum Liouville field approach. The
structure of momentum singularities is different from that of sphere amplitudes
and is more complicated. It ... | 1992-03-02 | 2007-05-23 | [
"hep-th"
] | Yoshiaki Tanii and Shun-ichi Yamaguchi |
hep-th/9203004 | Can fusion coefficients be calculated from the depth rule ? | The depth rule is a level truncation of tensor product coefficients expected
to be sufficient for the evaluation of fusion coefficients. We reformulate the
depth rule in a precise way, and show how, in principle, it can be used to
calculate fusion coefficients. However, we argue that the computation of the
depth itself... | 1992-03-02 | 2009-10-22 | [
"hep-th"
] | A.N. Kirillov, P. Mathieu, D. Senechal and M. Walton |
hep-th/9203005 | Unitary One Matrix Models: String Equations and Flows | We review the Symmetric Unitary One Matrix Models. In particular we discuss
the string equation in the operator formalism, the mKdV flows and the Virasoro
Constraints. We focus on the $\t$-function formalism for the flows and we
describe its connection to the (big cell of the) Sato Grassmannian $\Gr$ via
the Plucker em... | 1992-03-02 | 2007-05-23 | [
"hep-th"
] | K.N. Anagnostopoulos and M. J. Bowick |
hep-th/9203001 | Topological Phases of the Heterotic String | We analyze the phase structure of topological Calabi--Yau manifolds defined
on the moduli space of instantons. We show in this framework that topological
vacua describe new phases of the Heterotic String theory in which the flat
directions corresponding to complex deformations are lifted. We also briefly
discuss the ph... | 1992-03-01 | 2009-10-22 | [
"hep-th"
] | Jack Morse & Rolf Schimmrigk |
hep-th/9202092 | Strings on Curved Spacetimes: Black Holes, Torsion, and Duality | We present a general discussion of strings propagating on noncompact coset
spaces $G/H$ in terms of gauged WZW models, emphasizing the role played by
isometries in the existence of target space duality. Fixed points of the gauged
transformations induce metric singularities and, in the case of abelian
subgroups $H$, bec... | 1992-02-29 | 2010-11-01 | [
"hep-th"
] | Paul Ginsparg and Fernando Quevedo |
hep-th/9202091 | On a New Class of Integrable Models | We define a new class of integrable vertex models associated to quantum
groups at roots of unit | 1992-02-28 | 2015-06-26 | [
"hep-th"
] | A. Berkovich, C. Gomez and G.SIERRA |
hep-th/9202090 | From wormhole to time machine: Comments on Hawking's Chronology
Protection Conjecture | The recent interest in ``time machines'' has been largely fueled by the
apparent ease with which such systems may be formed in general relativity,
given relatively benign initial conditions such as the existence of traversable
wormholes or of infinite cosmic strings. This rather disturbing state of
affairs has led Hawk... | 1992-02-26 | 2009-10-22 | [
"hep-th"
] | By Matt Visser |
hep-th/9202087 | Picture Changing Operators in Closed Fermionic String Field Theory | We discuss appropriate arrangement of picture changing operators required to
construct gauge invariant interaction vertices involving Neveu-Schwarz states
in heterotic and closed superstring field theory. The operators required for
this purpose are shown to satisfy a set of descent equations. | 1992-02-26 | 2009-09-15 | [
"hep-th"
] | R. Saroja and A. Sen |
hep-th/9202089 | Correlation Functions in non critical (super) string theory | We consider the correlation functions of the tachyon vertex operator of the
super Liouville theory coupled to matter fields in the super Coulomb gas
formulation, on world sheets with spherical topology. After integrating over
the zero mode and assuming that the $s$ parameter takes an integer value, we
subsequently cont... | 1992-02-26 | 2015-06-26 | [
"hep-th"
] | E. Abdalla, M.C.B. Abdalla, D. Dalmazi, K. Harada |
hep-th/9202086 | Area-Preserving Diffeomorphisms, w_\infty Algebras and w_\infty Gravity | The w_\infty algebra is a particular generalization of the Virasoro algebra
with generators of higher spin 2,3,...,\infty. It can be viewed as the algebra
of a class of functions, relative to a Poisson bracket, on a suitably chosen
surface. Thus, w_\infty is a special case of area-preserving diffeomorphisms of
an arbit... | 1992-02-26 | 2007-05-23 | [
"hep-th"
] | E. Sezgin |
hep-th/9202088 | The Index of discontinuous Vector Fields: Topological Particles and
Vector Fields | We define the concepts of topological particles and topological radiation.
These are nothing more than connected components of defects of a vector field.
To each topological particle we assign an index which is an integer which is
conserved under interactions with other particles much as electric charge is
conserved. F... | 1992-02-26 | 2008-02-03 | [
"hep-th",
"math.GT"
] | Daniel H. Gottlieb and Geetha Samaranayake |
hep-th/9202084 | Cocycle Properties of String Theories on Orbifolds | We study cocycle properties of vertex operators and present an operator
representation of cocycle operators, which are attached to vertex operators to
ensure the duality of amplitudes. It is shown that this analysis makes it
possible to obtain the general class of consistent string theories on
orbifolds. | 1992-02-25 | 2008-11-26 | [
"hep-th"
] | Tsutomu Horiguchi, Makoto Sakamoto and Masayoshi Tabuse |
hep-th/9202083 | The General Class of String Theories on Orbifolds | We investigate the following three consistency conditions for constructing
string theories on orbifolds: i) the invariance of the energy-momentum tensors
under twist operators, ii) the duality of amplitudes and iii) modular
invariance of partition functions. It is shown that this investigation makes it
possible to obta... | 1992-02-25 | 2008-02-03 | [
"hep-th"
] | Makoto Sakamoto and Masayoshi Tabuse |
hep-th/9202079 | Self Duality and Quantization | Quantum theory of the free Maxwell field in Minkowski space is constructed
using a representation in which the self dual connection is diagonal. Quantum
states are now holomorphic functionals of self dual connections and a
decomposition of fields into positive and negative frequency parts is
unnecessary. The constructi... | 1992-02-24 | 2010-11-01 | [
"hep-th"
] | Abhay Ashtekar, Carlo Rovelli and Lee Smolin |
hep-th/9202082 | The Pokrovski-Talapov Phase Transitions and Quantum Groups | We show that the XY quantum chain in a magnetic field is invariant under a
two parameter deformation of the $SU(1/1)$ superalgebra. One is led to an
extension of the braid group and the Hecke algebras which reduce to the known
ones when the two parameter coincide. The physical significance of the two
parameters is disc... | 1992-02-24 | 2007-05-23 | [
"hep-th"
] | Haye Hinrichsen and Vladimir Rittenberg |
hep-th/9202085 | Critical Theories of the Dissipative Hofstadter Model | It has recently been shown that the dissipative Hofstadter model (dissipative
quantum mechanics of an electron subject to uniform magnetic field and periodic
potential in two dimensions) exhibits critical behavior on a network of lines
in the dissipation/magnetic field plane. Apart from their obvious condensed
matter i... | 1992-02-24 | 2009-10-22 | [
"hep-th"
] | C. Callan, A. Felce, and D. Freed |
hep-th/9202080 | Schwinger-Dyson Equations of Matrix Models for Open and Closed Strings | We study the Schwinger-Dyson equations of a matrix model for an open-closed
string theory. The free energy with source terms for scaling operators
satisfies the same Virasoro conditions as those of the pure closed string and
is obtained from that of the pure closed string by giving appropriate
nonvanishing background v... | 1992-02-24 | 2009-10-22 | [
"hep-th"
] | Yukihisa Itoh and Yoshiaki Tanii |
hep-th/9202081 | Matrix model with superconformal symmetry | A matrix model is presented which leads to the discrete ``eigenvalue model''
proposed recently by Alvarez-Gaum\'e {\it et.al.} for 2D supergravity (coupled
to superconformal matters). | 1992-02-24 | 2009-10-22 | [
"hep-th"
] | Michiaki Takama |
hep-th/9202076 | The G_Newton --> 0 Limit of Euclidean Quantum Gravity | Using the Ashtekar formulation, it is shown that the G_{Newton} --> 0 limit
of Euclidean or complexified general relativity is not a free field theory, but
is a theory that describes a linearized self-dual connection propagating on an
arbitrary anti-self-dual background. This theory is quantized in the loop
representat... | 1992-02-22 | 2010-04-06 | [
"hep-th"
] | Lee Smolin |
hep-th/9202077 | Non-Abelian Monopoles Coupled to Gravity | A static configuration of point charges held together by the gravitational
attraction is known to be given by the Majumdar-Papapetrou solution in the
Einstein-Maxwell theory. We consider a generalization of this solution to
non-Abelian monopoles of the Yang-Mills Higgs system coupled to gravity. The
solution is governe... | 1992-02-22 | 2009-12-30 | [
"hep-th"
] | B. S. Balakrishna and Kameshwar C. Wali |
hep-th/9202078 | A Possible Black Hole Background in c=1 Matrix Model | We propose a new space-time interpretation for c=1 matrix model with
potential $V(x)=-x^{2}/2-\m^{2}/2x^{2}$. It is argued that this particular
potential corresponds to a black hole background. Some related issues are
discussed. | 1992-02-22 | 2008-02-03 | [
"hep-th"
] | Zhu Yang |
hep-th/9202074 | A Model of Three-Dimensional Lattice Gravity | A model is proposed which generates all oriented $3d$ simplicial complexes
weighted with an invariant associated with a topological lattice gauge theory.
When the gauge group is $SU_q(2)$, $q^n=1,$ it is the Turaev-Viro invariant and
the model may be regarded as a non-perturbative definition of $3d$ simplicial
quantum ... | 1992-02-21 | 2010-11-01 | [
"hep-th"
] | D. Boulatov |
hep-th/9202075 | S-Wave Scattering of Charged Fermions by a Magnetic Black Hole | We argue that, classically, $s$-wave electrons incident on a magnetically
charged black hole are swallowed with probability one: the reflection
coefficient vanishes. However, quantum effects can lead to both electromagnetic
and gravitational backscattering. We show that, for the case of extremal,
magnetically charged, ... | 1992-02-21 | 2009-09-17 | [
"hep-th"
] | Mark Alford and Andrew Strominger |
hep-th/9202070 | Duality in Quantum Toda theory and W-algebras | We consider Quantum Toda theory associated to a general Lie algebra. We prove
that the conserved quantities in both conformal and affine Toda theories
exhibit duality interchanging the Dynkin diagram and its dual, and inverting
the coupling constant. As an example we discuss the conformal Toda theories
based on $B_2,B_... | 1992-02-20 | 2009-10-22 | [
"hep-th"
] | H. G. Kausch and G. M. T. Watts |
hep-th/9202069 | Quantum Conserved Currents in Affine Toda Theories | We study the renormalization and conservation at the quantum level of
higher-spin currents in affine Toda theories with particular emphasis on the
nonsimply-laced cases. For specific examples, namely the spin-3 current for the
$a_3^{(2)}$ and $c_2^{(1)}$ theories, we prove conservation to all-loop order,
thus establish... | 1992-02-20 | 2011-07-19 | [
"hep-th"
] | G.W. Delius, M.T. Grisaru and D. Zanon |
hep-th/9202073 | $Z_n$ Baxter Models and Quantum Symmetric Spaces | The scattering of two excitations (both of the simplest kind) in the magnetic
model related to the $Z_n$\--Baxter model is naturally described for $n
\rightarrow \infty$ in terms of the Macdonald polynomials for root system
$A_1$. These polynomials play the role of zonal spherical functions for a two
parameter family o... | 1992-02-20 | 2009-10-22 | [
"hep-th"
] | Peter G. O. Freund and Anton V. Zabrodin |
hep-th/9202071 | The reality conditions for the new canonical variables of General
Relativity | We examine the constraints and the reality conditions that have to be imposed
in the canonical theory of 4--d gravity formulated in terms of Ashtekar
variables. We find that the polynomial reality conditions are consistent with
the constraints, and make the theory equivalent to Einstein's, as long as the
inverse metric... | 1992-02-20 | 2010-04-06 | [
"hep-th"
] | Giorgio Immirzi (Universita' di Perugia & INFN Perugia, Italy) |
hep-th/9202072 | W-Infinity and String Theory | We review some recent developments in the theory of $W_\infty$. We comment on
its relevance to lower-dimensional string theory. | 1992-02-20 | 2009-10-22 | [
"hep-th"
] | X. Shen |
hep-th/9202062 | The Plumbing of Minimal Area Metrics | We study the metric of minimal area on a punctured Riemann surface under the
condition that all nontrivial homotopy closed curves be longer than or equal to
$2\pi$. By constructing deformations of admissible metrics we establish
necessary conditions on minimal area metrics and a partial converse to
Beurling's criterion... | 1992-02-19 | 2007-05-23 | [
"hep-th"
] | Michael Wolf and Barton Zwiebach |
hep-th/9202064 | Anomalies and Deconfinement | I discuss how instanton effects can be wiped-out due to the existence of
anomalies. I first consider Compact Quantum Electrodynamics in 3 dimensions
where confinement of electric charge is destroyed when fermions are added so
that a Chern-Simons term is generated as a one-loop effect. I also show that a
similar phenome... | 1992-02-19 | 2007-05-23 | [
"hep-th"
] | F. A. Schaposnik |
hep-th/9202065 | Algebraic Structures and Eigenstates for Integrable Collective Field
Theories | Conditions for the construction of polynomial eigen--operators for the
Hamiltonian of collective string field theories are explored. Such
eigen--operators arise for only one monomial potential $v(x) = \mu x^2$ in the
collective field theory. They form a $w_{\infty}$--algebra isomorphic to the
algebra of vertex operator... | 1992-02-19 | 2009-10-22 | [
"hep-th"
] | Jean Avan and Antal Jevicki |
hep-th/9202067 | Stringy Domain Walls and Other Stringy Topological Defects | We point out that the moduli sector of the $(2,2)$ string compactification
with its nonperturbatively preserved non-compact symmetries is a framework to
study global topological defects. Based on the target space modular invariance
of the nonperturbative superpotential of the four-dimensional $N=1$
supersymmetric strin... | 1992-02-19 | 2007-05-23 | [
"hep-th"
] | Mirjam Cvetic |
hep-th/9202063 | A Loop Representation for the Quantum Maxwell Field | Quantization of the free Maxwell field in Minkowski space is carried out
using a loop representation and shown to be equivalent to the standard Fock
quantization. Because it is based on coherent state methods, this framework may
be useful in quantum optics. It is also well-suited for the discussion of
issues related to... | 1992-02-19 | 2010-04-06 | [
"hep-th"
] | Abhay Ashtekar and Carlo Rovelli |
hep-th/9202061 | Exceptional Superconformal Algebras | Reductive W-algebras which are generated by bosonic fields of spin-1, a
single spin-2 field and fermionic fields of spin-3/2 are classified. Three new
cases are found: a `symplectic' family of superconformal algebras which are
extended by $su(2)\oplus sp(n)$, an $N=7$ and an $N=8$ superconformal algebra.
The exceptiona... | 1992-02-19 | 2009-10-22 | [
"hep-th"
] | P. Bowcock |
hep-th/9202068 | Properties of Asymptotically Flat Two-Dimensional Black Holes | We investigate properties of two-dimensional asymptotically flat black holes
which arise in both string theory and in scale invariant theories of gravity.
By introducing matter sources in the field equations we show how such objects
can arise as the endpoint of gravitational collapse. We examine the motion of
test part... | 1992-02-19 | 2010-04-06 | [
"hep-th"
] | R.B. Mann, M.S. Morris and S.F. Ross |
hep-th/9202066 | QCD Instantons and 2D Surfaces | Some time ago, Atiyah showed that there exists a natural identification
between the k-instantons of a Yang-Mills theory with gauge group $G$ and the
holomorphic maps from $CP_1$ to $\Omega G$. Since then, Nair and Mazur, have
associated the $\Theta $ vacua structure in QCD with self-intersecting Riemann
surfaces immers... | 1992-02-19 | 2015-06-26 | [
"hep-th"
] | V.G.J. Rodgers |
hep-th/9202060 | On Sibling and Exceptional W Strings | We discuss the physical spectrum for $W$ strings based on the algebras $B_n$,
$D_n$, $E_6$, $E_7$ and $E_8$. For a simply-laced $W$ string, we find a
connection with the $(h,h+1)$ unitary Virasoro minimal model, where $h$ is the
dual Coxeter number of the underlying Lie algebra. For the $W$ string based on
$B_n$, we fi... | 1992-02-18 | 2009-10-07 | [
"hep-th"
] | H. Lu, C.N. Pope, S. Schrans and X.J. Wang |
hep-th/9202058 | Hamiltonian Reduction and Classical Extended Superconformal Algebras | We present a systematic construction of classical extended superconformal
algebras from the hamiltonian reduction of a class of affine Lie superalgebras,
which include an even subalgebra $sl(2)$. In particular, we obtain the doubly
extended $N=4$ superconformal algebra $\tilde{A}_{\gamma}$ from the hamiltonian
reductio... | 1992-02-18 | 2009-10-22 | [
"hep-th"
] | Katsushi Ito and Jens Ole Madsen |
hep-th/9202059 | Axion Couplings and Effective Cut-Offs in Superstring Compactifications | We use the linear supermultiplet formalism of supergravity to study axion
couplings and chiral anomalies in the context of field-theoretical Lagrangians
describing orbifold compactifications beyond the classical approximation. By
matching amplitudes computed in the effective low energy theory with the
results of string... | 1992-02-18 | 2010-11-01 | [
"hep-th"
] | Mary K. Gaillard and T.R. Taylor |
hep-th/9202056 | Universal Field Equations with Reparametrisation Invariance | New reparametrisation invariant field equations are constructed which
describe $d$-brane models in a space of $d+1$ dimensions. These equations, like
the recently discovered scalar field equations in $d+1$ dimensions, are
universal, in the sense that they can be derived from an infinity of
inequivalent Lagrangians, but... | 1992-02-17 | 2009-10-22 | [
"hep-th"
] | D.B. Fairlie and J. Govaerts |
hep-th/9202055 | Canonical Quantization of 2d Gravity Coupled to c<1 Matter | We study 2d gravity coupled to $c,1$ matter through canonical quantization of
a free scalar field, with background charge, coupled to gravity. Various
features of the theory can be more easily understood in the canonical approach,
like gauge indipendence of the path-integral results and the absence of the
local physica... | 1992-02-17 | 2008-02-03 | [
"hep-th"
] | A. Mikovic |
hep-th/9202057 | Exchange Operator Formalism for Integrable Systems of Particles | We formulate one dimensional many-body integrable systems in terms of a new
set of phase space variables involving exchange operators. The hamiltonian in
these variables assumes a decoupled form. This greatly simplifies the
derivation of the conserved charges and the proof of their commutativity at the
quantum level. | 1992-02-17 | 2009-10-22 | [
"hep-th"
] | Alexios P. Polychronakos |
hep-th/9202053 | Representations of the holonomy algebras of gravity and non-Abelian
gauge theories | Holonomy algebras arise naturally in the classical description of Yang-Mills
fields and gravity, and it has been suggested, at a heuristic level, that they
may also play an important role in a non-perturbative treatment of the quantum
theory. The aim of this paper is to provide a mathematical basis for this
proposal.
... | 1992-02-15 | 2010-04-06 | [
"hep-th"
] | Abhay Ashtekar and C.J. Isham |
hep-th/9202054 | Gravitons and Loops | The recently proposed loop representation, used previously to find exact
solutions to the quantum constraints of general relativity, is here used to
quantize linearized general relativity. The Fock space of graviton states and
its associated algebra of observables are represented in terms of functionals
of loops. The `... | 1992-02-15 | 2010-11-01 | [
"hep-th"
] | Abhay Ashtekar, Carlo Rovelli and Lee Smolin |
hep-th/9202046 | Duality Anomaly Cancellation, Minimal String Unification and the
Effective Low-Energy Lagrangian of 4-D Strings | We present a systematic study of the constraints coming from target-space
duality and the associated duality anomaly cancellations on orbifold-like 4-D
strings. A prominent role is played by the modular weights of the massless
fields. We present a general classification of all possible modular weights of
massless field... | 1992-02-14 | 2009-10-07 | [
"hep-th"
] | Luis E. Ibanez and Dieter Luest |
hep-th/9202047 | Quasi-Quantum Groups, Knots, Three-Manifolds, and Topological Field
Theory | We show how to construct, starting from a quasi-Hopf algebra, or
quasi-quantum group, invariants of knots and links. In some cases, these
invariants give rise to invariants of the three-manifolds obtained by surgery
along these links. This happens for a finite-dimensional quasi-quantum group,
whose definition involves ... | 1992-02-14 | 2009-10-22 | [
"hep-th",
"math.QA"
] | Daniel Altschuler and Antoine Coste |
hep-th/9202048 | Bloch Electron in a Magnetic Field : Diagonalization of Tight-Binding
Models | A connection of a variety of tight-binding models of noninteracting electrons
on a rectangular lattice in a magnetic field with theta functions is
established. A new spectrum generating symmetry is discovered which essentialy
reduces the problem of diagonalization of these models. Provided that one knows
one eigenvecto... | 1992-02-14 | 2008-02-03 | [
"hep-th"
] | Alexander Moroz |
hep-th/9202052 | Topological Spin-Statistics Theorem for Strings | Recently, a topological proof of the spin-statistics Theorem has been
proposed for a system of point particles which does not require relativity or
field theory, but assumes the existence of antiparticles. We extend this proof
to a system of string loops in three space dimensions and show that by assuming
the existence... | 1992-02-14 | 2015-06-26 | [
"hep-th"
] | A.P.Balachandran, W.D.McGlinn, L.O'Raifeartaigh, S.Sen, R.D.Sorkin,
A.M.Srivastava |
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