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 |
|---|---|---|---|---|---|---|
gr-qc/9303034 | Junction Conditions for Signature Change | The change of signature of a metric is explained using simple examples and
methods. The Klein-Gordon field on a signature-changing background is
discussed, and it is shown how the approach of Dray et al.\ can be corrected to
ensure that the Klein-Gordon equation holds. Isotropic cosmologies are
discussed, and it is sho... | 1993-03-29 | 2008-02-03 | [
"gr-qc"
] | Sean A. Hayward |
gr-qc/9303029 | Critical Phenomena for Riemannian Manifolds: Simple Homotopy and
Simplicial Quantum Gravity | We show how Gromov's spaces of bounded geometries provide a general
mathematical framework for addressing and solving many of the issues of
$3D$-simplicial quantum gravity. In particular, we establish entropy estimates
characterizing the asymptotic distribution of combinatorially inequivalent
triangulated $3$-manifolds... | 1993-03-26 | 2007-08-09 | [
"gr-qc"
] | M. Carfora, A. Marzuoli |
gr-qc/9303031 | Uncertainty Relation at Finite Temperature | We use the quantum Brownian model to derive the uncertainty relation for a
quantum open system. We examine how the fluctuations of a quantum system evolve
after it is brought in contact with a heat bath at finite temperature. We study
the decoherence and relaxation processes and use this example to examine 1) the
relat... | 1993-03-26 | 2015-06-25 | [
"gr-qc"
] | B. L. Hu and Yuhong Zhang |
gr-qc/9303030 | Quasi-Local Gravitational Energy | A dynamically preferred quasi-local definition of gravitational energy is
given in terms of the Hamiltonian of a `2+2' formulation of general relativity.
The energy is well-defined for any compact orientable spatial 2-surface, and
depends on the fundamental forms only. The energy is zero for any surface in
flat spaceti... | 1993-03-26 | 2009-10-22 | [
"gr-qc"
] | Sean A. Hayward |
gr-qc/9303032 | Geometrodynamics vs. Connection Dynamics | The purpose of this review is to describe in some detail the mathematical
relationship between geometrodynamics and connection dynamics in the context of
the classical theories of 2+1 and 3+1 gravity. I analyze the standard
Einstein-Hilbert theory (in any spacetime dimension), the Palatini and
Chern-Simons theories in ... | 1993-03-26 | 2009-10-22 | [
"gr-qc"
] | Joseph D. Romano |
gr-qc/9303033 | Scalar and Spinor Fields in Signature Changing Spacetimes | The propagation of scalar and spinor fields in a spacetime whose metric
changes signature is analyzed. Recent work of Dray et al. on particle
production from signature change for a (massless) scalar field is reviewed, and
an attempt is made to extend their analysis to the case of a (massless)
spin-half field. In contra... | 1993-03-26 | 2009-10-22 | [
"gr-qc"
] | Joseph D. Romano |
gr-qc/9303027 | The Newtonian Limit for Asymptotically Flat Solutions of the
Vlasov-Einstein System | It is shown that there exist families of asymptotically flat solutions of the
Einstein equations coupled to the Vlasov equation describing a collisionless
gas which have a Newtonian limit. These are sufficiently general to confirm
that for this matter model as many families of this type exist as would be
expected on th... | 1993-03-25 | 2009-10-22 | [
"gr-qc"
] | Alan D. Rendall |
gr-qc/9303028 | Loop Variable Inequalities in Gravity and Gauge Theory | We point out an incompleteness of formulations of gravitational and gauge
theories that use traces of holonomies around closed curves as their basic
variables. It is shown that in general such loop variables have to satisfy
certain inequalities if they are to give a description equivalent to the usual
one in terms of l... | 1993-03-25 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | R. Loll |
gr-qc/9303025 | Radiation from a Uniformly Accelerated Charge and the Equivalence
Principle | We argue that purely local experiments can distinguish a stationary charged
particle in a static gravitational field from an accelerated particle in
(gravity-free) Minkowski space. Some common arguments to the contrary are
analyzed and found to rest on a misidentification of ``energy''. | 1993-03-20 | 2008-02-03 | [
"gr-qc",
"astro-ph",
"hep-ph",
"hep-th"
] | Stephen Parrott |
gr-qc/9303024 | Generalized Symmetries of the Einstein Equations | We reformulate the symmetries of Gurses [Phys. Rev. Lett. 70, 367 (1993)] in
a more abstract, more geometrical manner. The type (b) transformation of
\gurses\ is related to a diffeomorphism of the differentiable manifold onto
itself. The type (c) symmetry is replaced by a more general type (c-bar)
symmetry that has the... | 1993-03-20 | 2009-10-22 | [
"gr-qc"
] | Frederick J. Ernst and Isidore Hauser |
gr-qc/9303026 | Unique determination of an inner product by adjointness relations in the
algebra of quantum observables | It is shown that if a representation of a *-algebra on a vector space $V$ is
an irreducible *-representation with respect to some inner product on $V$ then
under appropriate technical conditions this property determines the inner
product uniquely up to a constant factor. Ashtekar has suggested using the
condition that ... | 1993-03-20 | 2010-04-06 | [
"gr-qc"
] | Alan D. Rendall |
gr-qc/9303023 | Inflationary Attractors and Perturbation Spectra in Generally Coupled
Gravity | A generic outcome of theories with scalar-tensor coupling is the existence of
inflationary attractors, either power-law or de Sitter. The fluctuations
arising during this phase are Gaussian and their spectrum depends on the
wavenumber $k$ according to the power-law $k^{1/(1-p)}$, where $p$ is the
inflationary power-law... | 1993-03-19 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Luca Amendola, Diego Bellisai and Franco Occhionero, Rome Astronomical
Observatory |
gr-qc/9303022 | Inconsistency between alternative approaches to Quantum Decoherence in
special systems | We study the decoherence properties of a certain class of Markovian quantum
open systems from both the Decohering Histories and Environment Induced
Superselection paradigms. The class studied includes many familiar quantum
optical cases. For this class, we show that there always exists a basis which
leads to {\em exact... | 1993-03-19 | 2007-05-23 | [
"gr-qc"
] | J. Twamley |
gr-qc/9303021 | Non-Analytic Extension of the Kinnersley-Chitre Group for Colliding
Plane Gravitational Waves. I | A program is outlined concerning the set of all solutions of the hyperbolic
Ernst equation on a two-dimensional manifold whose underlying topological space
is the same as the domain of all Ernst potentials for colliding plane
gravitational wave pairs. The aim of the program is to construct and apply a
non-trivial exten... | 1993-03-17 | 2008-02-03 | [
"gr-qc"
] | Isidore Hauser and Frederick J. Ernst |
gr-qc/9303020 | Clock Time and Entropy | Testable conditional probabilities appear to be restricted to single
hypersurfaces (marvelous moments) and depend only on stationary observables.
Observable evolution, such as a change of entropy, should be expressed as a
dependence upon clock time, not upon inaccessible coordinate time. | 1993-03-12 | 2008-02-03 | [
"gr-qc"
] | Don N. Page |
gr-qc/9303019 | Loop Representations for 2+1 Gravity on a Torus | We study the loop representation of the quantum theory for 2+1 dimensional
general relativity on a manifold, $M = {\cal T}^2 \times {\cal R}$, where
${\cal T}^2$ is the torus, and compare it with the connection representation
for this system. In particular, we look at the loop transform in the part of
the phase space w... | 1993-03-12 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | Donald Marolf |
gr-qc/9303018 | Wave Functions of the Induced 2D-Gravity | We consider the induced $2$d-gravity in the minisuperspace approach. The
general solution to the Wheeler-DeWitt equation is given in terms of different
kind of Bessel functions of purely real or imaginary orders. We study the
properties of the corresponding probability distribution finding a kind of
phase transition at... | 1993-03-12 | 2011-04-20 | [
"gr-qc"
] | J. Navarro-Salas, M. Navarro and V. Aldaya |
gr-qc/9303017 | Topologica Defects and Corrections to the Nambu Action | The effective action of a (1+2)-dimensional defect is obtained as an
expansion in powers of the thickness.Considering non-straight solutions as the
zero order term, the corrections to the Nambu action are found to depend on the
curvature scalar and on the gaussian curvature . | 1993-03-11 | 2008-11-26 | [
"gr-qc"
] | Vanda Silveira and M.D. Maia (Universidade de Brasilia) |
gr-qc/9303015 | Bibliography of Publications related to Classical and Quantum Gravity in
terms of the Ashtekar Variables | This bibliography attempts to give a comprehensive overview of all the
literature related to the Ashtekar variables. The original version was compiled
by Peter Huebner in 1989, and it has been subsequently updated by Gabriela
Gonzalez and Bernd Bruegmann. Information about additional literature, new
preprints, and espe... | 1993-03-10 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | Bernd Bruegmann |
gr-qc/9303016 | The Isaacson expansion in quantum cosmology | This paper is an application of the ideas of the Born-Oppenheimer (or
slow/fast) approximation in molecular physics and of the Isaacson (or
short-wave) approximation in classical gravity to the canonical quantization of
a perturbed minisuperspace model of the kind examined by Halliwell and Hawking.
Its aim is the clari... | 1993-03-10 | 2010-11-01 | [
"gr-qc"
] | Carsten Gundlach |
gr-qc/9303014 | Maxwell Fields in Spacetimes Admitting Non-Null Killing Vectors | We consider source-free electromagnetic fields in spacetimes possessing a
non-null Killing vector field, $\xi^a$. We assume further that the
electromagnetic field tensor, $F_{ab}$, is invariant under the action of the
isometry group induced by $\xi^a$. It is proved that whenever the two
potentials associated with the e... | 1993-03-10 | 2010-04-06 | [
"gr-qc"
] | Istvan Racz |
gr-qc/9303013 | Torsion and Nonmetricity in Scalar-Tensor Theories of Gravity | We show that the gravitational field equations derived from an action
composed of i) an arbitrary function of the scalar curvature and other scalar
fields plus ii) connection-independent kinetic and source terms, are identical
whether one chooses nonmetricity to vanish and have non-zero torsion or vice
versa. | 1993-03-09 | 2010-04-06 | [
"gr-qc"
] | Jean-paul Berthias and Bahman Shahid-Saless |
gr-qc/9303012 | Microcanonical Action and the Entropy of a Rotating Black Hole | The authors have recently proposed a ``microcanonical functional integral"
representation of the density of quantum states of the gravitational field. The
phase of this real--time functional integral is determined by a
``microcanonical" or Jacobi action, the extrema of which are classical
solutions at fixed total energ... | 1993-03-08 | 2007-05-23 | [
"gr-qc",
"astro-ph",
"hep-th"
] | J. David Brown and James W. York |
gr-qc/9303011 | The Construction of Sorkin Triangulations | Some time ago, Sorkin (1975) reported investigations of the time evolution
and initial value problems in Regge calculus, for one triangulation each of the
manifolds $R*S^3$ and $R^4$. Here we display the simple, local characteristic
of those triangulations which underlies the structure found by Sorkin, and
emphasise it... | 1993-03-05 | 2010-04-06 | [
"gr-qc"
] | Philip Tuckey |
gr-qc/9303010 | The Extended Loop Group: An Infinite Dimensional Manifold Associated
with the Loop Space | A set of coordinates in the non parametric loop-space is introduced. We show
that these coordinates transform under infinite dimensional linear
representations of the diffeomorphism group. An extension of the group of loops
in terms of these objects is proposed. The enlarged group behaves locally as an
infinite dimensi... | 1993-03-04 | 2009-10-22 | [
"gr-qc"
] | Cayetano Di Bartolo, Rodolfo Gambini and Jorge Griego |
gr-qc/9303009 | Conformal Fourth-Rank Gravity | We consider the consequences of describing the metric properties of space-
time through a quartic line element $ds^4=G_{\mu\nu\lambda\rho}dx^\mu dx^\nu
dx^\lambda dx^\rho$. The associated "metric" is a fourth-rank tensor
$G_{\mu\nu\lambda\rho}$. We construct a theory for the gravitational field
based on the fourth-rank... | 1993-03-03 | 2007-05-23 | [
"gr-qc"
] | Victor Tapia, A.L. Marrakchi and M. Cataldo |
gr-qc/9303005 | Motion and Trajectories of Particles Around Three-Dimensional Black
Holes | The motion of relativistic particles around three dimensional black holes
following the Hamilton-Jacobi formalism is studied. It follows that the
Hamilton-Jacobi equation can be separated and reduced to quadratures in analogy
with the four dimensional case. It is shown that: a) particles are trapped by
the black hole i... | 1993-03-02 | 2010-04-06 | [
"gr-qc"
] | C. Farina, J. Gamboa and A. J. Segui-Santonja |
gr-qc/9303008 | No Superluminal Expansion of the Universe | The apparent superluminal growth in the size of a sufficiently large part of
the universe can be ascribed to the special relativistic effect of time
dilation. | 1993-03-02 | 2007-05-23 | [
"gr-qc"
] | Don N. Page |
gr-qc/9303004 | The Quantization of the Spacetime Geometry Generated by Planckian Energy
Particles | We study the quantization of the curved spacetime created by
ultrarelativistic particles at Planckian energies. We consider a minisuperspace
model based on the classical shock wave metric generated by these particles,
and for which the Wheeler - De Witt equation is solved exactly. The wave
function of the geometry is a... | 1993-03-02 | 2008-02-03 | [
"gr-qc",
"astro-ph",
"hep-th"
] | C.O.Lousto and N.Sanchez |
gr-qc/9303007 | The Universality of Einstein Equations | It is shown that for a wide class of analytic Lagrangians which depend only
on the scalar curvature of a metric and a connection, the application of the
so--called ``Palatini formalism'', i.e., treating the metric and the connection
as independent variables, leads to ``universal'' equations. If the dimension
$n$ of spa... | 1993-03-02 | 2010-12-13 | [
"gr-qc",
"hep-th"
] | M.Ferraris, M.Francaviglia and I.Volovich |
gr-qc/9303006 | General Laws of Black-Hole Dynamics | A general definition of a black hole is given, and general `laws of
black-hole dynamics' derived. The definition involves something similar to an
apparent horizon, a trapping horizon, defined as a hypersurface foliated by
marginal surfaces of one of four non-degenerate types, described as future or
past, and outer or i... | 1993-03-02 | 2009-10-22 | [
"gr-qc"
] | Sean A. Hayward |
gr-qc/9303001 | A Cosmological Theory without Singularities | A theory of gravitation is constructed in which all homogeneous and isotropic
solutions are nonsingular, and in which all curvature invariants are bounded.
All solutions for which curvature invariants approach their limiting values
approach de Sitter space. The action for this theory is obtained by a higher
derivative ... | 1993-03-01 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-th"
] | R. Brandenberger (Brown), V. Mukhanov (ETH Zuerich) and A. Sornborger
(Brown) |
gr-qc/9303003 | String-Like Structures in Complex Kerr Geometry | The Kerr geometry is represented as being created by a source moving along an
analytical complex world-line. The equivalence of this complex world-line and
an Euclidean version of complex strings (hyperbolic strings) is discussed. It
is shown that the complex Kerr source satisfies the corresponding string
equations. Th... | 1993-03-01 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | A. Burinskii |
gr-qc/9303002 | The Scalar Field Equation in the Presence of Signature Change | We consider the (massless) scalar field on a 2-dimensional manifold with
metric that changes signature from Lorentzian to Euclidean. Requiring a
conserved momentum in the spatially homogeneous case leads to a particular
choice of propagation rule. The resulting mix of positive and negative
frequencies depends only on t... | 1993-03-01 | 2016-08-31 | [
"gr-qc",
"hep-th"
] | Tevian Dray, Corinne A. Manogue, and Robin W. Tucker |
gr-qc/9302035 | A Pictorial History of Some Gravitational Instantons | Four-dimensional Euclidean spaces that solve Einstein's equations are
interpreted as WKB approximations to wavefunctionals of quantum geometry. These
spaces are represented graphically by suppressing inessential dimensions and
drawing the resulting figures in perspective representation of
three-dimensional space, some ... | 1993-02-26 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | Dieter Brill and Kay-Thomas Pirk |
gr-qc/9302037 | A Model of Topological Affine Gravity in Two Dimensions | A model of two--dimensional gravity with an action depending only on a linear
connection is considered. This model is a topological one, in the sense that
the classical action does not contain a metric or zweibein at all. A metric and
an additional vector field are instead introduced in the process of solving
equations... | 1993-02-26 | 2019-08-17 | [
"gr-qc",
"hep-th"
] | M.Ferraris, M.Francaviglia and I.Volovich |
gr-qc/9302036 | Quantum Effects In Cosmology | Contents:
Introduction. The Present State of the Universe.
What Can We Expect From a Complete Cosmological Theory?
An Overview of Quantum Effects in Cosmology.
Parametric (Superadiabatic) Amplification of Classical Waves.
Graviton Creation in the Inflationary Universe.
Quantum States of a Harmonic Oscillato... | 1993-02-26 | 2010-04-06 | [
"gr-qc"
] | L.P. Grishchuk ( Physics Department, Washington University, St. Louis,
U.S.A.) |
gr-qc/9302034 | On the Cosmology of Massive Vector Fields with SO(3) Global Symmetry | A relevant reference ([14]) has been added. | 1993-02-23 | 2010-04-06 | [
"gr-qc"
] | M.C. Bento, O. Bertolami, P.V. Moniz, J.M. Mourao and P.M. S\'a |
gr-qc/9302033 | Symmetries of the Einstein Equations | Generalized symmetries of the Einstein equations are infinitesimal
transformations of the spacetime metric that formally map solutions of the
Einstein equations to other solutions. The infinitesimal generators of these
symmetries are assumed to be local, \ie at a given spacetime point they are
functions of the metric a... | 1993-02-23 | 2009-10-22 | [
"gr-qc"
] | C. G. Torre and I. M. Anderson |
gr-qc/9302029 | Quantum and Thermal Fluctuations, Uncertainty Principle, Decoherence and
Classicality* | We scrutize the commonly used criteria for classicality and examine their
underlying issues. The two major issues we address here are that of decoherence
and fluctuations. We borrow the insights gained in the study of the
semiclassical limit of quantum cosmology to discuss the three criteria of
classicality for a quant... | 1993-02-22 | 2007-05-23 | [
"gr-qc"
] | B. L. Hu and Yuhong Zhang |
gr-qc/9302032 | Do Black Holes Exist? | The problem of information loss in black hole formation and the associated
violations of basic laws of physics, such as conservation of energy, causality
and unitarity, are avoided in the nonsymmetric gravitational theory, if the NGT
charge of a black hole and its mass satisfy an inequality that does not violate
any kn... | 1993-02-22 | 2007-05-23 | [
"gr-qc"
] | J. W. Moffat |
gr-qc/9302028 | Karolyhazy's quantum space-time generates neutron star density in vacuum | By simple arguments, we have shown that Karolyhazy's model overestimates the
quantum uncertainty of the space-time geometry and leads to absurd physical
consequences. The given model can thus not account for gradual violation of
quantum coherence and can not predict tiny experimental effects either. | 1993-02-22 | 2008-11-26 | [
"gr-qc"
] | L.Diosi and B.Lukacs |
gr-qc/9302030 | Critical Dynamics in the Early Universe | Methods and concepts for the study of phase transitions mediated by a
time-dependent order-parameter field in curved spacetimes are discussed. A
practical example is the derivation of an effective (quasi-)potential for the
description of `slow-roll' inflation in the early universe. We first summarize
our early results ... | 1993-02-22 | 2010-04-06 | [
"gr-qc"
] | B. L. Hu |
gr-qc/9302031 | Quantum Statistical Processes in the Early Universe | We show how the concept of quantum open system and the methods in
non-equilibrium statistical mechanics can be usefully applied to studies of
quantum statistical processes in the early universe. We first sketch how noise,
fluctuation, dissipation and decoherence processes arise in a wide range of
cosmological problems.... | 1993-02-22 | 2009-10-22 | [
"gr-qc"
] | B. L. Hu |
gr-qc/9302026 | Minisuperspaces: Symmetries and Quantization | In several of the class A Bianchi models, minisuperspaces admit symmetries.
It is pointed out that they can be used effectively to complete the Dirac
quantization program. The resulting quantum theory provides a useful platform
to investigate a number of conceptual and technical problems of quantum
gravity. | 1993-02-21 | 2007-05-23 | [
"gr-qc"
] | Abhay Ashtekar, Ranjeet S. Tate and Claes Uggla |
gr-qc/9302027 | Minisuperspaces: Observables and Quantization | A canonical transformation is performed on the phase space of a number of
homogeneous cosmologies to simplify the form of the scalar (or, Hamiltonian)
constraint. Using the new canonical coordinates, it is then easy to obtain
explicit expressions of Dirac observables, i.e.\ phase space functions which
commute weakly wi... | 1993-02-21 | 2009-07-10 | [
"gr-qc"
] | Abhay Ashtekar, Ranjeet S. Tate and Claes Uggla |
gr-qc/9302022 | Symmetric solutions of Einstein-Yang-Mills equations | Symmetric gauge fields and invariant metrics in homogeneous spaces are found.
Their use for finding exact solutions of the Einstein-Yang-Mills (EYM)
equations is discussed. | 1993-02-19 | 2016-08-14 | [
"gr-qc"
] | J.M. Mour\~ao |
gr-qc/9302023 | Brill Waves | Brill waves are the simplest (non-trivial) solutions to the vacuum
constraints of general relativity. They are also rich enough in structure to
allow us believe that they capture, at least in part, the generic properties of
solutions of the Einstein equations. As such, they deserve the closest
attention. This article i... | 1993-02-19 | 2007-05-23 | [
"gr-qc"
] | Niall \'O Murchadha |
gr-qc/9302025 | Minisuperspace as a Quantum Open System | We trace the development of ideas on dissipative processes in chaotic
cosmology and on minisuperspace quantum cosmology from the time Misner proposed
them to current research. We show 1) how the effect of quantum processes like
particle creation in the early universe can address the issues of the isotropy
and homogenei... | 1993-02-19 | 2007-05-23 | [
"gr-qc"
] | B. L. Hu, Juan Pablo Paz and Sukanya Sinha |
gr-qc/9302024 | Mathematical Problems of Non-perturbative Quantum General Relativity | The purpose of these lectures is to discuss in some detail a new,
non-perturbative approach to quantum gravity. I would like to present the basic
ideas, outline the key results that have been obtained so far and indicate
where we are headed and what the hopes are. The audience at this summer school
had a diverse backgr... | 1993-02-19 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | Abhay Ashtekar |
gr-qc/9302021 | Fluctuation, Dissipation and Irreversibility in Cosmology | We discuss the appearance of time-asymmetric behavior in physical processes
in cosmology and in the dynamics of the Universe itself. We begin with an
analysis of the nature and origin of irreversibility in well-known physical
processes such as dispersion, diffusion, dissipation and mixing, and make the
distinction betw... | 1993-02-18 | 2007-05-23 | [
"gr-qc"
] | B. L. Hu |
gr-qc/9302020 | The Initial Value Problem in Light of Ashtekar's Variables | The form of the initial value constraints in Ashtekar's hamiltonian
formulation of general relativity is recalled, and the problem of solving them
is compared with that in the traditional metric variables. It is shown how the
general solution of the four diffeomorphism constraints can be obtained
algebraically provided... | 1993-02-18 | 2007-05-23 | [
"gr-qc"
] | R. Capovilla, J. Dell and T. Jacobson |
gr-qc/9302019 | A more accurate analytic calculation of the spectrum of cosmological
perturbations produced during inflation | Formulae are derived for the spectra of scalar curvature perturbations and
gravitational waves produced during inflation, special cases of which include
power law inflation, natural inflation in the small angle approximation and
inflation in the slow roll approximation. | 1993-02-18 | 2008-11-26 | [
"gr-qc",
"astro-ph",
"hep-ph"
] | E.D.Stewart and D.H.Lyth |
gr-qc/9302018 | Impossible Measurements on Quantum Fields | It is shown that the attempt to extend the notion of ideal measurement to
quantum field theory leads to a conflict with locality, because (for most
observables) the state vector reduction associated with an ideal measurement
acts to transmit information faster than light. Two examples of such
information-transfer are g... | 1993-02-17 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | Rafael D. Sorkin |
gr-qc/9302017 | Proof of the Generalized Second Law for Quasistationary Semiclassical
Black Holes | A simple direct explicit proof of the generalized second law of black hole
thermodynamics is given for a quasistationary semiclassical black hole. | 1993-02-15 | 2010-11-01 | [
"gr-qc"
] | Valery P. Frolov and Don N. Page |
gr-qc/9302015 | The quantum behavior of general time dependent quadratic systems
linearly coupled to a bath | In this paper we solve for the quantum propagator of a general time dependent
system quadratic in both position and momentum, linearly coupled to an infinite
bath of harmonic oscillators. We work in the regime where the quantum optical
master equation is valid. We map this master equation to a Schroedinger
equation on ... | 1993-02-11 | 2008-11-26 | [
"gr-qc"
] | J. Twamley |
gr-qc/9302014 | Towards a Nonsingular Universe | A unified theory of all forces should be nonsingular. In such a unified
theory, Einstein's general relativity will be a very low curvature effective
theory. At larger curvatures, new terms will become important. The question
then arises as to whether it is possible to construct an effective action for
gravity which lea... | 1993-02-11 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-th"
] | Robert H. Brandenberger (Brown University) |
gr-qc/9302016 | Quantum Cosmology | An elementary review of quantum cosmology. (Talk given at Texas/Pascos 1992
at Berkeley) | 1993-02-11 | 2009-10-22 | [
"gr-qc"
] | Alexander Vilenkin |
gr-qc/9302010 | Cosmology with Nonminimal Derivative Couplings | We study a theory which generalizes the nonminimal coupling of matter to
gravity by including derivative couplings. This leads to several interesting
new dynamical phenomena in cosmology. In particular, the range of parameters in
which inflationary attractors exist is greatly expanded. We also numerically
integrate the... | 1993-02-10 | 2009-10-22 | [
"gr-qc"
] | Luca Amendola (Rome Astronomical Observatory) |
gr-qc/9302012 | Geometry of the 2+1 Black Hole | The geometry of the spinning black holes of standard Einstein theory in 2+1
dimensions, with a negative cosmological constant and without couplings to
matter, is analyzed in detail. It is shown that the black hole arises from
identifications of points of anti-de Sitter space by a discrete subgroup of
$SO(2,2)$. The gen... | 1993-02-10 | 2009-12-30 | [
"gr-qc"
] | Maximo Banados, Marc Henneaux, Claudio Teitelboim, Jorge Zanelli |
gr-qc/9302011 | Finite, diffeomorphism invariant observables in quantum gravity | Two sets of spatially diffeomorphism invariant operators are constructed in
the loop representation formulation of quantum gravity. This is done by
coupling general relativity to an anti- symmetric tensor gauge field and using
that field to pick out sets of surfaces, with boundaries, in the spatial three
manifold. The ... | 1993-02-10 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Lee Smolin |
gr-qc/9302013 | Decoherence of Correlation Histories | We use a $\lambda\Phi^4$ scalar quantum field theory to illustrate a new
approach to the study of quantum to classical transition. In this approach, the
decoherence functional is employed to assign probabilities to consistent
histories defined in terms of correlations among the fields at separate points,
rather than th... | 1993-02-10 | 2007-05-23 | [
"gr-qc"
] | E. Calzetta and B. L. Hu |
gr-qc/9302008 | The Structure of Naked Singularity in Self-similar Gravitational
Collapse II | Generalizing the results of Joshi and Dwivedi in Commun.Math.Phys. 146, p.333
(1992), it is pointed out that strong curvature naked singularities could occur
in the self-similar gravitational collapse of any form of matter satisfying the
weak energy condition for the positivity of mass-energy density. | 1993-02-09 | 2009-10-22 | [
"gr-qc"
] | P.S.Joshi and I.H.Dwivedi |
gr-qc/9302009 | Towards the Theory of Stationary Universe | This talk presents some progress achieved in collaboration with A.Linde and
D.Linde towards understanding the true nature of the global spatial structure
of the Universe as well as the most general stationary characteristics of its
time-dependent state with eternally growing total volume. | 1993-02-09 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-ph"
] | Arthur Mezhlumian |
gr-qc/9302007 | The renormalization group for non-renormalizable theories: Einstein
gravity with a scalar field | We develop a renormalization-group formalism for non-renormalizable theories
and apply it to Einstein gravity theory coupled to a scalar field with the
Lagrangian $L=\sqrt{g} [R U(\phi)-{1/2} G(\phi) g^{\mu\nu} \partial_{\mu}\phi
\partial_{\nu}\phi- V(\phi)]$, where $U(\phi), G(\phi)$ and $V(\phi)$ are
arbitrary functi... | 1993-02-08 | 2011-07-19 | [
"gr-qc"
] | A.O.Barvinsky, A.Yu.Kamenshchik and I.P.Karmazin |
gr-qc/9302004 | Two-loop effective potential in quantum field theory in curved
space-time | The method of the calculation of effective potential (in linear curvature
approximation and at any loop) in massless gauge theory in curved space- time
by the direct solution of RG equation is given.The closed expression for
two-loop effective potential is obtained.Two-loop effective potential in scalar
self-interactin... | 1993-02-05 | 2016-08-31 | [
"gr-qc"
] | S.D.Odintsov |
gr-qc/9302005 | On limits of spacetimes -- a coordinate-free approach | A coordinate-free approach to limits of spacetimes is developed. The limits
of the Schwarzschild metric as the mass parameter tends to 0 or $\infty$ are
studied, extending previous results. Besides the known Petrov type D and 0
limits, three vacuum plane-wave solutions of Petrov type N are found to be
limits of the Sch... | 1993-02-05 | 2010-04-06 | [
"gr-qc",
"astro-ph"
] | F. M. Paiva, M. J. Rebou\c{c}as and M. A. H. MacCallum |
gr-qc/9302006 | Quantum Theory of Black Holes | A solvable 2-dimensional conformally invariant midi-superspace model for
black holes is obtained by imposing spherical symmetry in 4-dimensional
conformally invariant Einstein gravity. The Wheeler-DeWitt equation for the
theory is solved exactly to obtain the unique quantum wave functional for an
isolated black hole wi... | 1993-02-05 | 2009-12-30 | [
"gr-qc",
"hep-th"
] | J. Gegenberg and G. Kunstatter |
gr-qc/9302003 | Dynamics and Collision of Massive Shells in Curved Backgrounds | We analyse the dynamics of the collision of two spherical massive shells in a
generally spherically symmetric background, obtaining an expression from the
conservation law that imposes a constraint between the different parameters
involved. We study the light-like limit and make some comparisons of the
predictions of o... | 1993-02-03 | 2010-04-06 | [
"gr-qc",
"astro-ph"
] | D. Nunez, H. P. de Oliveira, and J. Salim |
gr-qc/9302002 | Complex Numbers, Quantum Mechanics and the Beginning of Time | A basic problem in quantizing a field in curved space is the decomposition of
the classical modes in positive and negative frequency. The decomposition is
equivalent to a choice of a complex structure in the space of classical
solutions. In our construction the real tunneling geometries provide the link
between the thi... | 1993-02-02 | 2009-10-07 | [
"gr-qc"
] | G.W. Gibbons and H.J. Pohle |
gr-qc/9302001 | Singularity Free Inhomogeneous Cosmological Stiff Fluid Models | We present a singularity free class of inhomogeneous cylindrical universes
filled with stiff perfect fluid $(\rho = p)$. Its matter free $ (\rho = 0)$
limit yield two distinct vacuum spacetimes which can be considered as analogues
of Kasner solution for inhomogeneous singularity free spacetime. | 1993-02-01 | 2007-05-23 | [
"gr-qc"
] | L. K. Patel and N. Dadhich |
gr-qc/9301024 | Topological Defects in Gravitational Theories with Non Linear
Lagrangians | The gravitational field of monopoles, cosmic strings and domain walls is
studied in the quadratic gravitational theory $R+\alpha R^2$ with $\alpha
|R|\ll 1$, and is compared with the result in Einstein's theory. The metric
aquires modifications which correspond to a short range `Newtonian' potential
for gauge cosmic st... | 1993-02-01 | 2016-08-31 | [
"gr-qc",
"astro-ph",
"hep-th"
] | J. Audretsch, A. Economou and C.O. Lousto |
gr-qc/9301023 | Avoiding degenerate coframes in an affine gauge approach to quantum
gravity | In quantum models of gravity, it is surmized that configurations with
degenerate coframes could occur during topology change of the underlying
spacetime structure. However, the coframe is not the true Yang--Mills type
gauge field of the translations, since it lacks the inhomogeneous gradient term
in the gauge transform... | 1993-01-29 | 2008-11-26 | [
"gr-qc",
"hep-th"
] | E.W. Mielke, J.D. McCrea, Y. Ne'eman, F.W. Hehl |
gr-qc/9301022 | An Anisotropic Wormhole:TUNNELLING in Time and Space | We discuss the structure of a gravitational euclidean instanton obtained
through coupling of gravity to electromagnetism. Its topology at fixed $t$ is
$S^1\times S^2$. This euclidean solution can be interpreted as a tunnelling to
a hyperbolic space (baby universe) at $t=0$ or alternatively as a static
wormhole that joi... | 1993-01-27 | 2009-10-22 | [
"gr-qc"
] | M. Cavaglia' V. de Alfaro and F. de Felice |
gr-qc/9301021 | Black Holes with a Generalized Gravitational Action | Microscopic black holes are sensitive to higher dimension operators in the
gravitational action. We compute the influence of these operators on the
Schwarzschild solution using perturbation theory. All (time reversal invariant)
operators of dimension six are included (dimension four operators don't alter
the Schwarzsch... | 1993-01-26 | 2010-01-06 | [
"gr-qc",
"hep-th"
] | Ming Lu and Mark B. Wise |
gr-qc/9301019 | Comments on Closed Bianchi Models | We show several kinematical properties that are intrinsic to the Bianchi
models with compact spatial sections. Especially, with spacelike hypersurfaces
being closed, (A) no anisotropic expansion is allowed for Bianchi type V and
VII(A\not=0), and (B) type IV and VI(A\not=0,1) does not exist. In order to
show them, we p... | 1993-01-25 | 2010-04-06 | [
"gr-qc"
] | Y.Fujiwara, H.Ishihara and H.Kodama |
gr-qc/9301020 | On the configuration space topology in general relativity | The configuration-space topology in canonical General Relativity depends on
the choice of the initial data 3-manifold. If the latter is represented as a
connected sum of prime 3-manifolds, the topology receives contributions from
all configuration spaces associated to each individual prime factor. There are
by now stro... | 1993-01-25 | 2007-05-23 | [
"gr-qc"
] | Domenico Giulini |
gr-qc/9301018 | Jacobi's Action and the Density of States | The authors have introduced recently a ``microcanonical functional integral"
which yields directly the density of states as a function of energy. The phase
of the functional integral is Jacobi's action, the extrema of which are
classical solutions at a given energy. This approach is general but is
especially well suite... | 1993-01-18 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | J. David Brown and James W. York |
gr-qc/9301017 | The Origin of Time Asymmetry | It is argued that the observed Thermodynamic Arrow of Time must arise from
the boundary conditions of the universe. We analyse the consequences of the no
boundary proposal, the only reasonably complete set of boundary conditions that
has been put forward. We study perturbations of a Friedmann model containing a
massive... | 1993-01-18 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | S.W. Hawking, R. Laflamme and G.W. Lyons |
gr-qc/9301016 | Time, measurement and information loss in quantum cosmology | An error in the gauge fixed quantization of section 3 is corrected. The
result is a much simpler treatment of the clock field, leading to a
simplification of the gauge fixed quantum theory and the treatment of the
semiclassical limit. | 1993-01-15 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | Lee Smolin |
gr-qc/9401012 | A Proposal of Positive-Definite Local Gravitational Energy Density in
General Relativity | We propose a 4-dimensional Kaluza-Klein approach to general relativity in the
(2,2)-splitting of space-time using the double null gauge. The associated
Lagrangian is equivalent to the Einstein-Hilbert Lagrangian, since it yields
the same field equations as the E-H Lagrangian does. It is describable as a
(1+1)-dimension... | 1993-01-15 | 2007-05-23 | [
"gr-qc"
] | J.H. Yoon |
gr-qc/9301014 | On Self-Dual Gravity I | (One typo corrected and one incorrect statement removed. Extra details on
conserved quantities and symmetry algebras added). | 1993-01-14 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | James D.E. Grant |
gr-qc/9301013 | "Are Black Holes in Brans-Dicke Theory precisely the same as in General
Relativity?" | We study a three-parameters family of solutions of the Brans-Dicke field
equations. They are static and spherically symmetric. We find the range of
parameters for which this solution represents a black hole different from the
Schwarzschild one. We find a subfamily of solutions which agrees with
experiments and observat... | 1993-01-14 | 2010-11-01 | [
"gr-qc",
"astro-ph",
"hep-th"
] | M.Campanelli and C.O.Lousto |
gr-qc/9301015 | A Positive Mass Theorem Based on the Focusing and Retardation of Null
Geodesics | A positive mass theorem for General Relativity Theory is proved. The proof is
4-dimensional in nature, and relies completely on arguments pertaining to
causal structure, the basic idea being that positive energy-density focuses
null geodesics, and correspondingly retards them, whereas a negative total mass
would advanc... | 1993-01-14 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | R.Penrose, R.D. Sorkin, and E. Woolgar |
gr-qc/9301012 | Massive Spin-5/2 Fields Coupled to Gravity: Tree-Level Unitarity vs. the
Equivalence Principle | I show that the gravitational scattering amplitudes of a spin-5/2 field with
mass $m\ll M_{Pl}$ violate tree-level unitarity at energies
$\sqrt{s}\approx\sqrt{mM_{Pl}}$ if the coupling to gravity is minimal.
Unitarity up to energies $\sqrt{s}\approx M_{Pl}$ is restored by adding a
suitable non-minimal term, which gives... | 1993-01-14 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Massimo Porrati |
gr-qc/9301011 | The Reduction of the State Vector and Limitations on Measurement in the
Quantum Mechanics of Closed Systems | Measurement is a fundamental notion in the usual approximate quantum
mechanics of measured subsystems. Probabilities are predicted for the outcomes
of measurements. State vectors evolve unitarily in between measurements and by
reduction of the state vector at measurements. Probabilities are computed by
summing the squa... | 1993-01-13 | 2014-01-14 | [
"gr-qc",
"hep-th",
"quant-ph"
] | James B. Hartle |
gr-qc/9301010 | Entropy Production in the Cosmological Amplification of the Vacuum
Fluctuations | We estimate the entropy associated to a background of squeezed cosmic
gravitons, and we argue that the process of cosmological pair production from
the vacuum may explain the large amount of entropy of our present universe. | 1993-01-12 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | M.Gasperini and M.Giovannini |
gr-qc/9301008 | What is the True Description of Charged Black Holes? | If string theory describes nature, then charged black holes are not described
by the Reissner-Nordstrom solution. This solution must be modified to include a
massive dilaton. In the limit of vanishing dilaton mass, the new solution can
be found by a generalization of the Harrison transformation for the
Einstein-Maxwell... | 1993-01-12 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | Gary T. Horowitz |
gr-qc/9301009 | Cosmology, Oscillating Physics and Oscilllating Biology | According to recent reports there is an excess correlation and an apparent
regularity in the galaxy one-dimensional polar distribution with a
characteristic scale of 128 $h^{-1}$ Mpc. This aparent spatial periodicity can
be naturally explained by a time oscillation of the gravitational constant $G$.
On the other hand, ... | 1993-01-11 | 2010-11-01 | [
"gr-qc"
] | Pablo Sisterna and Hector Vucetich |
gr-qc/9301007 | Decoherence Functional and Probability Interpretation | We confirm that the diagonal elements of the Gell-Mann and Hartle's
decoherence decoherence functional are equal to the relative frequencies of the
results of many identical experiments, when a set of alternative histories
decoheres. We consider both cases of the pure and mixed initial states. | 1993-01-09 | 2009-10-22 | [
"gr-qc"
] | Yoshiaki Ohkuwa |
gr-qc/9301006 | Real Tunneling Solutions and the Hartle-Hawking Wave Function | A real tunneling solution is an instanton for the Hartle-Hawking path
integral with vanishing extrinsic curvature (vanishing ``momentum'') at the
boundary. Since the final momentum is fixed, its conjugate cannot be specified
freely; consequently, such an instanton will contribute to the wave function at
only one or a f... | 1993-01-08 | 2010-04-28 | [
"gr-qc",
"hep-th"
] | S. Carlip |
gr-qc/9301005 | Time Symmetric Quantum Cosmology and Our Universe | We investigate the time neutral formulation of quantum cosmology of Gell-Mann
and Hartle. In particular we study the proposal discussed by them that our
Universe corresponds to the time symmetric decoherence functional with initial
and final density matrix of low entropy. We show that our Universe does not
correspond t... | 1993-01-08 | 2010-04-06 | [
"gr-qc"
] | Raymond Laflamme |
gr-qc/9301004 | On the Definition of Decoherence | We examine the relationship between the decoherence of quantum-mechanical
histories of a closed system (as discussed by Gell-Mann and Hartle) and
environmentally-induced diagonalization of the density operator for an open
system. We study a definition of decoherence which incorporates both of these
ideas, and show that... | 1993-01-07 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | J. Finkelstein |
gr-qc/9301002 | Event horizons and apparent horizons in spherically symmetric geometries | Spherical configurations that are very massive must be surrounded by apparent
horizons. These in turn, when placed outside a collapsing body, must propagate
outward with a velocity equal to the velocity of radially outgoing photons.
That proves, within the framework of (1+3) formalism and without resorting to
the Birkh... | 1993-01-06 | 2014-11-17 | [
"gr-qc"
] | Edward Malec |
gr-qc/9301003 | Observing binary inspiral in gravitational radiation: One interferometer | We investigate the sensitivity of individual LIGO/VIRGO-like interferometers
and the precision with which they can determine the characteristics of an
inspiralling binary system. Since the two interferometers of the LIGO detector
share nearly the same orientation, their joint sensitivity is similar to that
of a single,... | 1993-01-06 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Lee Samuel Finn and David F. Chernoff |
gr-qc/9301001 | Bianchi Cosmological Models and Gauge Symmetries | We analyze carefully the problem of gauge symmetries for Bianchi models, from
both the geometrical and dynamical points of view. Some of the geometrical
definitions of gauge symmetries (=``homogeneity preserving diffeomorphisms'')
given in the literature do not incorporate the crucial feature that local gauge
transform... | 1993-01-05 | 2010-04-06 | [
"gr-qc"
] | Olivier Coussaert and Marc Henneaux |
hep-lat/9312088 | The Isgur-Wise Function: A Lattice Determination from Pseudoscalar -->
Pseudoscalar Form Factors | Form factors for pseudoscalar --> pseudoscalar decays of heavy-light mesons
are found in quenched lattice QCD with heavy-quark masses in the range of
approximately 1-2 GeV. The Isgur-Wise function, $\xi(\omega)$, is extracted
from these form factors. Results are in good agreement with $\xi(\omega)$
derived from CLEO me... | 1993-12-30 | 2010-11-01 | [
"hep-lat"
] | UKQCD Collaboration, James N. Simone |
hep-lat/9312087 | A Magnetic Monopole in Pure SU(2) Gauge Theory | The magnetic monopole in euclidean pure SU(2) gauge theory is investigated
using a background field method on the lattice.
With Monte Carlo methods we study the mass of the monopole in the full
quantum theory.
The monopole background under the quantum fluctuations is induced by imposing
fixed monopole boundary cond... | 1993-12-29 | 2009-10-22 | [
"hep-lat",
"hep-th"
] | J. Smit and A.J. Van Der Sijs |
hep-lat/9312085 | A definition of the running coupling constant in a twisted SU(2) lattice
gauge theory | We propose a definition of the running coupling constant in a SU(2) lattice
gauge theory with twisted boundary conditions. It is based on the correlation
of Polyakov loops extended in a twisted direction at a distance which is a
fixed fraction of the totale lattice size. We make the perturbative calculation
which conne... | 1993-12-28 | 2009-10-22 | [
"hep-lat"
] | G.M. de Divitiis, R. Frezzotti, M. Guagnelli and R. Petronzio |
hep-lat/9312086 | Heavy-light and light-light weak matrix elements on the lattice | I review recent developments in lattice weak matrix element calculations. I
focus on on $f_B$ (both with propagating quarks and in the static limit for the
$b$ quark), semi-leptonic form factors for $D$ meson decay, form factors for $B
\to K^* \gamma$, and $B_K$. [Review presented at Lattice '93] | 1993-12-28 | 2009-10-22 | [
"hep-lat",
"hep-ph"
] | Claude Bernard |
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