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received from Thu 9 Jan 97 01:00:01 GMT to Fri 10 Jan 97 01:00:00 GMT
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Paper: hep-th/9701031
From: Remo Garattini <Gara...@mi.infn.it>
Date: Thu, 9 Jan 1997 02:04:01 +0100 (NFT)
Title: Energy Computation in Wormhole Background with the Wheeler-DeWitt
Operators
Author: Remo Garattini
Comments: 4 pages, LaTeX file uses espcrc2, Talk given at the Second Meeting on
Constrained Dynamics and Quantum Gravity, Santa Margherita Ligure, September
17-21, 1996, to appear in the Proceedings
\\
We investigate the possibility of computing energy by means of operators
associated to the Wheeler-DeWitt equation. By choosing three dimensional
wormholes as a framework, we apply such calculation scheme to the black hole
pair creation. We compare our results with the recent ones appeared in the
literature.
\\ (http://xxx.lanl.gov/abs/hep-th/9701031 , 6kb)
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Paper: hep-th/9701032
From: "Shin'ichi NOJIRI (2200)" <noj...@cmr4w1.cc.nda.ac.jp>
Date: Thu, 09 Jan 1997 12:40:57 +0900
Title: Effective Lagrangian and static black holes in 2D dilatonic gravity
Author: Shin'ichi Nojiri, Sergei D. Odintsov
Comments: Latex file, 13 pages
Report-no: NDA-FP-30
\\
We study the effective action in 2D dilaton-Maxwell quantum gravity. Working
with the one-loop renormalizable subset of such theories, we construct the
improved effective Lagrangian which contains curvature under logarithm. The
static black holes (BH) solutions which may play the role of a remnant after
the Hawking radiation for such an effective theory are carefully investigated.
The effective Lagrangian for Gross-Neveu-dilaton gravity is also constructed
(in 1/N expansion).
\\ (http://xxx.lanl.gov/abs/hep-th/9701032 , 8kb)
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Paper: hep-th/9701033
From: Waldemar Puszkarz <pusz...@cosm.sc.edu>
Date: Wed, 8 Jan 1997 23:28:52 -0500 (EST)
Title: Quantum gravitational measure for three-geometries
Author: Pawel O. Mazur
Comments: 16 pages, TeX. This is the original, preprint version of the paper
that with some modifications was published in
Journal-ref: Phys. Lett. B262, 405 (1991)
\\
The gravitational measure on an arbitrary topological three-manifold is
constructed. The nontrivial dependence of the measure on the conformal factor
is discussed. We show that only in the case of a compact manifold with boundary
the measure acquires a nontrivial dependence on the conformal factor which is
given by the Liouville action. A nontrivial Jacobian (the divergent part of it)
generates the Einstein-Hilbert action. The Hartle-Hawking wave function of
Universe is given in terms of the Liouville action. In the gaussian
approximation to the Wheeler-DeWitt equation this result was earlier derived by
Banks et al. Possible connection with the Chern-Simons gravity is also
discussed.
\\ (http://xxx.lanl.gov/abs/hep-th/9701033 , 11kb)
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Paper: hep-th/9701034
From: Hitoshi Konno <ko...@mis.hiroshima-u.ac.jp>
Date: Thu, 9 Jan 1997 13:13:25 +0900 (JST)
Title: Degeneration of the Elliptic Algebra $A_{q,p}(\widehat{sl_2})$ and Form
Factors in the sine-Gordon Theory
Author: Hitoshi Konno (Hiroshima University, Dept. of Math. IAS)
Comments: 21 pages, LaTeX file, Talk given at the Nankai-CRM joint meeting on
"Extended and Quantum Algebras and their Applications to Physics", Tianjin,
China, August 19-24, 1996. To appear in the CRM series in mathematical
physics, Springer Verlag
\\
Following the work with Jimbo and Miwa, we introduce a certain degeneration
of the elliptic algebra $A_{q,p}(\widehat{sl_2})$ and its boson realization. We
investigate its rational limit. The limit is the central extension of the
Yangian double DY(sl_2) at level one. We give a new boson realization of it.
Based on these algebras, we reformulate the Smirnov's form factor bootstrap
approach to the sine-Gordon theory and the SU(2) invariant Thirring model. A
conjectural integral formula for form factor in the sine-Gordon theory is
derived.
\\ (http://xxx.lanl.gov/abs/hep-th/9701034 , 16kb)
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Paper: hep-th/9701035
From: M...@wmf.univ.szczecin.pl
Date: Thu, 9 Jan 1997 14:05:23 +2
Title: Boundary Conditions in Quantum String Cosmology
Authors: Mariusz P. Dabrowski and Claus Kiefer
Comments: 16 pages, REVTEX
Report-no: Freiburg THEP-96/25
\\
We discuss in detail how to consistently impose boundary conditions in
quantum string cosmology. Since a classical time parameter is absent in quantum
gravity, such conditions must be imposed with respect to intrinsic variables.
Constructing wave packets for minisuperspace models from different tree-level
string effective actions, we explain in particular the meaning of a transition
between ``pre-big-bang" and ``post-big-bang" branches. This leads to a scenario
different from previous considerations.
\\ (http://xxx.lanl.gov/abs/hep-th/9701035 , 11kb)
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Paper: hep-th/9701036
From: naga...@eken.phys.nagoya-u.ac.jp (Yukinori Nagatani)
Date: Fri, 10 Jan 1997 03:32:56 +0900
Title: Dynamical Symmetry Breaking in Fractal Space
Authors: Yukinori Nagatani (Nagoya University)
Comments: 28 pages, 5 figures, LaTeX with epsf macro
Report-no: DPNU-96-61
\\
We formulate field theories in fractal space and show the phase diagrams of
the coupling versus the fractal dimension for the dynamical symmetry breaking.
We first consider the 4-dimensional Gross-Neveu (GN) model in the
(4-d)-dimensional randomized Cantor space where the fermions are restricted to
a fractal space by the high potential barrier of Cantor fractal shape. By the
statistical treatment of this potential, we obtain an effective action
depending on the fractal dimension. Solving the 1/N leading Schwinger-Dyson
(SD) equation, we get the phase diagram of dynamical symmetry breaking with a
critical line similar to that of the d-dimensional (2<d<4) GN model except for
the system-size dependence. We also consider QED4 with only the fermions
formally compactified to d dimensions. Solving the ladder SD equation, we
obtain the phase diagram of dynamical chiral symmetry breaking with a linear
critical line, which is consistent with the known results for d=4 (the
Maskawa-Nakajima case) and d=2 (the case with the external magnetic field).
\\ (http://xxx.lanl.gov/abs/hep-th/9701036 , 19kb)
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Paper (*cross-listing*): gr-qc/9701009
From: moh...@prl.ernet.in (Subhendra Mohanty)
Date: Tue, 7 Jan 1997 17:41:55 +0530
Title: Geodesic Deviation of Photons in Einstein and Higher Derivative Gravity
Authors: Subhendra Mohanty and A.R. Prasanna
Comments: LaTeX file, 12 pages
Report-no: PRL-TH-97/01
\\
We derive the wave equation obeyed by electromagnetic fields in curved
spacetime. We find that there are Riemann and Ricci curvature coupling terms to
the photon polarisation which result in a polarisation dependent deviation of
the photon trajectories from null geodesics. Photons are found to have an
effective mass in an external gravitational field and their velocity in a local
inertial frame is in general less than c. The effective photon mass in the
Schwarzschild metric is $m_\gamma = ( 2GM/r^3 )^{1/2}$ and near the horizon it
is larger than the Hawking temperature of the blackhole. Our result implies
that Hawking radiation of photons would not take place. We also conclude that
there is no superluminal photon velocity in higher derivative gravity theories
(arising from QED radiative corrections), as has been claimed in literature. We
show that these erroneous claims are due to the neglect of the Riemann and
Ricci coupling terms which exist in Einstein's gravity.
\\ (http://xxx.lanl.gov/abs/gr-qc/9701009 , 7kb)
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Paper (*cross-listing*): hep-lat/9701003
From: Mike Teper <m.te...@physics.oxford.ac.uk>
Date: Wed, 8 Jan 1997 12:38:52 GMT
Title: SU(N) gauge theories for all N in 3 and 4 dimensions
Authors: M. Teper (Oxford)
Comments: LaTeX.
Report-no: OUTP-97-01P
\\
We compare the mass spectra and string tensions of SU(2), SU(3) and SU(4)
gauge theories in 2+1 dimensions. We find that the ratios of masses are, to a
first approximation, independent of N and that the remaining dependence can be
accurately reproduced by a simple O(1/N^2) correction. This provides us with a
prediction of these mass ratios for all SU(N) theories in 2+1 dimensions and
demonstrates that these theories are `close' to N=\infty for N\geq 2. We also
find that, when expressed in units of the dynamical length scale of the theory,
the dimensionful coupling g^2 is proportional to 1/N at large N. We confirm
that these theories are indeed confining in the limit N \to \infty. We describe
preliminary calculations in 3+1 dimensions which indicate that the same will be
true there.
\\ (http://xxx.lanl.gov/abs/hep-lat/9701003 , 13kb)
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Paper (*cross-listing*): hep-ph/9612426
From: Lisa Randall <li...@ctptop.mit.edu>
Date: Thu, 19 Dec 96 18:51:26 -0500
Date (revised): Thu, 19 Dec 96 22:48:01 -0500
Title: New Mechanisms of Gauge-Mediated Supersymmetry Breaking
Author: Lisa Randall
Comments: LaTeX, BoxedEPS, 23 pages, 3 figures included
Report-no: MIT-CTP-2591
\\
We introduce new mechanisms for the communication of supersymmetry breaking
via gauge interactions. These models do not require complicated dynamics to
induce a nonvanishing F term for a singlet. The first class of models
communicates supersymmetry breaking to the visible sector through a ``mediator"
field that transforms under both a messenger gauge group of the dynamical
supersymmetry breaking sector and the standard model gauge group. This model
has distinctive phenomenology; in particular, the scalar superpartners should
be heavier by at least an order of magnitude than the gaugino superpartners.
The second class of models has phenomenology more similar to the ``standard"
messenger sectors. A singlet is incorporated, but the model does not require
complicated mechanisms to generate a singlet F term. The role of the singlet
is to couple fields from the dynamical symmetry breaking sector to fields
transforming under the standard model gauge group. We also mention a potential
solution to the $\mu$ problem.
\\ (http://xxx.lanl.gov/abs/hep-ph/9612426 , 65kb)
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Paper (*cross-listing*): q-alg/9701007
From: an...@insti.physics.sunysb.edu
Date: Wed, 8 Jan 1997 11:38:13 -0500
Title: Supernomial coefficients, polynomial identities and q-series
Authors: Anne Schilling and S. Ole Warnaar
Comments: 34 pages, Latex2e, figures
Report-no: ITP-SB-97-03, preprint University of Melbourne No. 01-97
\\
q-Analogues of the coefficients of x^a in the expansion of $\prod_{j=1}^N
(1+x+...+x^j)^{L_j}$ are proposed. Useful properties, such as recursion
relations, symmetries and limiting theorems of the ``q-supernomial
coefficients'' are derived, and a combinatorial interpretation using
generalized Durfee dissection partitions is given. Polynomial identities of
boson-fermion-type, based on the continued fraction expansion of p/k and
involving the q-supernomial coefficients, are proven. These include polynomial
analogues of the Andrews-Gordon identities. Our identities unify and extend
many of the known boson-fermion identities for one-dimensional configuration
sums of solvable lattice models, by introducing multiple finitization
parameters.
\\ (q-alg/9701007 , 34kb)
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Paper (*cross-listing*): q-alg/9701008
From: Pavel Etingof <eti...@abel.MATH.HARVARD.EDU>
Date: Wed, 8 Jan 1997 19:11:50 -0500 (EST)
Title: Factorization of differential operators, quasideterminants, and
nonabelian Toda field equations
Authors: Pavel Etingof, Israel Gelfand, and Vladimir Retakh
Comments: 8 pages, amstex
Report-no: FDO-1
\\
We integrate nonabelian Toda field equations for root systems of types A, B,
C, for functions with values in any associative algebra. The solution is
expressed via quasideterminants.
\\ (q-alg/9701008 , 7kb)
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Paper: hep-th/9510015
replaced with revised version Thu, 9 Jan 1997 16:41:44 +0200 (EET)
Title: q-Schrodinger Equations for V=u^2+ 1/u^2 and Morse Potentials in terms
of the q-canonical Transformation
Authors: O.F. Dayi and I.H. Duru
Comments: version to appear in IJMPA, minor changes and refs. added
Report-no: MRC-PH-TH-6/95
\\ (http://xxx.lanl.gov/abs/hep-th/9510015 , 9kb)
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Paper: hep-th/9604167
replaced with revised version Thu, 9 Jan 1997 16:42:58 +0200 (EET)
Title: Consistent Interactions in terms of the Generalized Fields Method
Author: O.F. Dayi
Comments: to appear in IJMPA, extended and some refs. added
Report-no: MRC.PH.TH-6-96
\\ (http://xxx.lanl.gov/abs/hep-th/9604167 , 8kb)
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Paper: hep-th/9609017
replaced with revised version Thu, 9 Jan 97 12:23:53 -0500
Title: On the algebras of BPS states
Authors: Jeffrey A. Harvey and Gregory Moore
Comments: 43 pages, harvmac (b), no figures. References added. We clarify the
use of the term GKM
\\ (http://xxx.lanl.gov/abs/hep-th/9609017 , 43kb)
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Paper: hep-th/9612200
replaced with revised version Thu, 9 Jan 1997 18:25:43 +0100 (MET)
Title: Perturbative gravitational couplings and Siegel modular forms in
$D=4,N=2$ string models
Authors: G. L. Cardoso
Comments: 8 pages, Latex 2.09, Contribution to the Proceedings of the 30th
International Symposium Ahrenshoop on the Theory of Elementary Particles,
Buckow, August 27-31, 1996
\\ (http://xxx.lanl.gov/abs/hep-th/9612200 , 11kb)
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Paper: hep-th/9701019
replaced with revised version Thu, 9 Jan 1997 15:19:38 +0100 (MET)
Title: (Half) a Lecture on D-branes
Author: C. Bachas (CPTh, Ecole Polytechnique)
Comments: 20 pages, Latex. To appear in the proceedings of the Workshop on
Gauge Theories, Applied Supersymmetry and Quantum Gravity, Imperial College,
London (July 1996). Minor typos corrected
Report-no: CPTH- PC491.0197
\\ (http://xxx.lanl.gov/abs/hep-th/9701019 , 24kb)
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Paper: hep-th/9701024
replaced with revised version Thu, 09 Jan 1997 15:28:11 EST
Title: What If Dirac Pionini Existed in a Purely Chiral Superfield Formulation?
Authors: S. James Gates, Jr. and Lubna Rana
Comments: Latex file, no figures, 13 page, Report No: UMDEPP 97-74, Correction
made in the title
\\ (http://xxx.lanl.gov/abs/hep-th/9701024 , 19kb)
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