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 |
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gr-qc/9306023 | Entropy in Black Hole Pair Production | Pair production of Reissner-Nordstrom black holes in a magnetic field can be
described by a euclidean instanton. It is shown that the instanton amplitude
contains an explicit factor of $e^{A/4}$, where $A$ is the area of the event
horizon. This is consistent with the hypothesis that $e^{A/4}$ measures the
number of bla... | 1993-06-18 | 2009-09-17 | [
"gr-qc",
"hep-th"
] | D. Garfinkle, S.B. Giddings, and A. Strominger |
gr-qc/9306024 | Faraday lines and observables for the Einstein-Maxwell theory | In recent work on Einstein gravity in four dimensions using the Ashtekar
variables, non-local loop variables have played an important role in attempts
to formulate a quantum theory. The introduction of such variables is guided by
gauge invariance, and here an infinite set of loop variables is introduced for
the Hamilto... | 1993-06-18 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | Viqar Husain |
gr-qc/9306022 | The No-Hair Conjecture in 2D Dilaton Supergravity | We study two dimensional dilaton gravity and supergravity following
hamiltonian methods. Firstly, we consider the structure of constraints of 2D
dilaton gravity and then the 2D dilaton supergravity is obtained taking the
squere root of the bosonic constraints. We integrate exactly the equations of
motion in both cases ... | 1993-06-17 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | J. Gamboa and Y. Georgelin |
gr-qc/9306021 | Global existence of classical solutions to the Vlasov-Poisson system in
a three dimensional, cosmological setting | The initial value problem for the Vlasov-Poisson system is by now well
understood in the case of an isolated system where, by definition, the
distribution function of the particles as well as the gravitational potential
vanish at spatial infinity. Here we start with homogeneous solutions, which
have a spatially constan... | 1993-06-16 | 2009-10-22 | [
"gr-qc"
] | Gerhard Rein and Alan D. Rendall |
gr-qc/9306019 | Dirac equation in some homogeneous$sqace-times, separation of variables
and exact solutions | In the present article, using a further generalization of the algebraic
method of separation of variables, the Dirac equation is separated in a family
of space-times where it is not possible to find a complete set of first order
commuting differential operators. After separating variables, the Dirac
equation is reduced... | 1993-06-16 | 2016-08-14 | [
"gr-qc"
] | V\'ictor M. Villalba |
gr-qc/9306020 | A regularity theorem for solutions of the spherically symmetric
Vlasov-Einstein system | In a previous paper two of the authors (G. R. and A. D. R.) showed that there
exist global, classical solutions of the spherically symmetric Vlasov-Einstein
system for small initial data. The present paper continues this investigation
and allows also large initial data. It is shown that if a solution of the
spherically... | 1993-06-16 | 2015-06-25 | [
"gr-qc"
] | Gerhard Rein, Alan D. Rendall, and Jack Schaeffer |
gr-qc/9306018 | Canonical Quantum Supergravity in Three Dimensions, (some lines lost
during submission) | We discuss the canonical treatment and quantization of matter coupled
supergravity in three dimensions, with special emphasis on $N=2$ supergravity.
We then analyze the quantum constraint algebra; certain operator ordering
ambiguities are found to be absent due to local supersymmetry. We show that the
supersymmetry con... | 1993-06-15 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | H.-J. Matschull and H. Nicolai |
gr-qc/9306017 | Supersymmetric Homogeneous Quantum Cosmologies Coupled to a Scalar Field | Recent work on $N=2$ supersymmetric Bianchi type IX cosmologies coupled to a
scalar field is extended to a general treatment of homogeneous quantum
cosmologies with explicitely solvable momentum constraints, i.e. Bianchi types
I, II, VII, VIII besides the Bianchi type IX, and special cases, namely the
Friedmann univers... | 1993-06-14 | 2009-10-22 | [
"gr-qc"
] | J. Bene (INSTITUTE for Solid State Physics, E\"otv\"os University,
Muzeum krt. 6-8, H-1088 Budapest, Hungary) and R. Graham (FACHBEREICH Physik,
Universit\"at Gesamthochschule Essen D4300 Essen 1, Germany) |
gr-qc/9306016 | Topology, Decoherence, and Semiclassical Gravity | We address the issue of recovering the time-dependent Schr\"{o}dinger
equation from quantum gravity in a natural way. To reach this aim it is
necessary to understand the nonoccurrence of certain superpositions in quantum
gravity.
We explore various possible explanations and their relation. These are the
delocalisatio... | 1993-06-11 | 2010-11-01 | [
"gr-qc"
] | C. Kiefer |
gr-qc/9306014 | The Fourth Law of Black Hole Thermodynamics | We show that black holes fulfill the scaling laws arising in critical
transitions. In particular, we find that in the transition from negative to
positive values the heat capacities $C_{JQ}$, $C_{\Omega Q}$ and $C_{J\Phi}$
give rise to critical exponents satisfying the scaling laws. The three
transitions have the same ... | 1993-06-10 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-th"
] | C.O.Lousto |
gr-qc/9306015 | Squeezed Thermal Vacuum and the Maximum Scale for Inflation | We consider the stimulated emission of gravitons from an initial state of
thermal equilibrium, under the action of the cosmic gravitational background
field. We find that the low-energy graviton spectrum is enhanced if compared
with spontaneous creation from the vacuum; as a consequence, the scale of
inflation must be ... | 1993-06-10 | 2010-01-06 | [
"gr-qc",
"astro-ph",
"hep-th"
] | M.Gasperini, M.Giovannini and G.Veneziano |
gr-qc/9306013 | Quasiclassical Equations of Motion for Nonlinear Brownian Systems | Following the formalism of Gell-Mann and Hartle, phenomenological equations
of motion are derived from the decoherence functional formalism of quantum
mechanics, using a path-integral description. This is done explicitly for the
case of a system interacting with a ``bath'' of harmonic oscillators whose
individual motio... | 1993-06-08 | 2009-10-22 | [
"gr-qc"
] | Todd A. Brun |
gr-qc/9306012 | Gravitation vs. Rotation in 2+1 Dimensions | We investigate rotation and rotating structures in (2+1)-dimensional Einstein
gravity. We show that rotation generally leads to pathological physical
situations. | 1993-06-08 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | N. J. Cornish and N. E. Frankel |
gr-qc/9306011 | Cosmic Censorship for Some Spatially Homogeneous Cosmological Models | The global properties of spatially homogeneous cosmological models with
collisionless matter are studied. It is shown that as long as the mean
curvature of the hypersurfaces of homogeneity remains finite no singularity can
occur in finite proper time as measured by observers whose worldlines are
orthogonal to these hyp... | 1993-06-08 | 2009-10-22 | [
"gr-qc"
] | Alan D. Rendall |
gr-qc/9306010 | Superluminal Black Holes | The new solution of the Einstein equations in empty space is presented. The
solution is constructed using Schwarzschild solution but essentially differs
from it. The basic properties of the solution are: the existence of a horizon
which is a hyperboloid of one sheet moving along its axis with superluminal
velocity, rig... | 1993-06-07 | 2007-05-23 | [
"gr-qc"
] | D.S.Dolgov |
gr-qc/9306009 | Analytic Solutions for Cosmological Perturbations in Multi-Dimensional
Space-Time | We obtain analytic solutions for the density contrast and the anisotropic
pressure in a multi-dimensional FRW cosmology with collisionless, massless
matter. These are compared with perturbations of a perfect fluid universe. To
describe the metric perturbations we use manifest gauge invariant metric
potentials. The matt... | 1993-06-07 | 2011-04-15 | [
"gr-qc",
"astro-ph"
] | Dominik J. Schwarz |
gr-qc/9306008 | Deflationary Universe Scenario | We show that it is possible to realize an inflationary scenario even without
conversion of the false vacuum energy to radiation. Such cosmological models
have a deflationary stage in which $Ha^2$ is decreasing and radiation produced
by particle creation in an expanding Universe becomes dominant. The preceding
inflation... | 1993-06-04 | 2010-04-06 | [
"gr-qc"
] | Boris Spokoiny |
gr-qc/9306006 | Classification of Multivector Theories and the Modification of the
Postulates of Physics | We propose a graded classification of the entire field of multivector
physics, including all alternative points of view. The (often tacit) postulates
of different types of formulations are contrasted, summarizing their
consequences. Specifically, spin-gauge formulations of gravitation and GUT
which assume standard colu... | 1993-06-03 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | William M. Pezzaglia |
gr-qc/9306007 | Pull Back Invariant Matter Couplings | An algorithm is described for the construction of actions for scalar, spinor,
and vector gauge fields that remains well-defined when the metric is degenerate
and that involve no contravariant tensor fields. These actions produce the
standard matter dynamics and coupling to gravity when tetrad is nondegenerate,
but have... | 1993-06-03 | 2010-04-06 | [
"gr-qc"
] | Donald Marolf |
gr-qc/9306004 | Phase-Space Decoherence: a comparison between Consistent Histories and
Environment Induced Superselection | We examine the decoherence properties of a quantum open system as modeled by
a quantum optical system in the Markov regime. We look for decoherence in both
the Environment Induced Superselection (EIS) and Consistent Histories (CH)
frameworks. We propose a general measure of the coherence of the reduced
density matrix a... | 1993-06-02 | 2009-10-22 | [
"gr-qc"
] | J.Twamley |
gr-qc/9306005 | Local and global gravitational aspects of domain wall space-times | Local and global gravitational effects induced by eternal vacuum domain walls
are studied. We concentrate on thin walls between non-equal and non-positive
cosmological constants on each side of the wall. These vacuum domain walls fall
in three classes depending on the value of their energy density $\sigma$: (1)\
extrem... | 1993-06-02 | 2009-09-17 | [
"gr-qc",
"hep-th"
] | Mirjam Cveti\v{c}, Stephen Griffies, and Harald H. Soleng |
gr-qc/9306002 | Hilbert space of wormholes | Wormhole boundary conditions for the Wheeler--DeWitt equation can be derived
from the path integral formulation. It is proposed that the wormhole wave
function must be square integrable in the maximal analytic extension of
minisuperspace. Quantum wormholes can be invested with a Hilbert space
structure, the inner produ... | 1993-06-01 | 2010-11-01 | [
"gr-qc"
] | Luis J. Garay |
gr-qc/9306003 | Consistency of the Nonsymmetric Gravitational Theory | The NGT field equations with sources are expanded first about a flat
Minkowski background and then about a GR background to first-order in the
antisymmetric part of the fundamental tensor, $g_{\mu\nu}$. From the general,
static spherically symmetric solution of the field equation in empty space, we
establish that there... | 1993-06-01 | 2008-02-03 | [
"gr-qc"
] | J. W. Moffat |
gr-qc/9306001 | Compactification to Non-symmetric Homogeneous Space in Multidimensional
Einstein-Yang-Mills Theory | We study ten-dimensional Einstein-Yang-Mills model with the space of extra
dimensions being a non-symmetric homogeneous space with the invariant metric
parametrized by two scales. Dimensional reduction of the model is carried out
and the scalar potential of the reduced theory is calculated. In a cosmological
setting mi... | 1993-06-01 | 2007-05-23 | [
"gr-qc"
] | Yu.A. Kubyshin and J.I. Perez Cadenas |
gr-qc/9305025 | Solutions to the Wheeler DeWitt Constraint of Canonical Gravity Coupled
to Scalar Matter Fields | It is shown that the Wheeler DeWitt constraint of canonical gravity coupled
to Klein Gordon scalar fields and expressed in terms of Ashtekar's variables
admits formal solutions which are parametrized by loops in the three
dimensional hypersurface and which are extensions of the well known Wilson loop
solutions found by... | 1993-05-26 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | H.-J. Matschull |
gr-qc/9305024 | A Proposal for Solving the ``Problem of Time" in Canonical Quantum
Gravity | The "problem of time" in canonical quantum gravity refers to the difficulties
involved in defining a Hilbert space structure on states -- and local
observables on this Hilbert space -- for a theory in which the spacetime metric
is treated as a quantum field, so no classical metrical or causal structure is
present on sp... | 1993-05-25 | 2009-12-30 | [
"gr-qc"
] | Robert M. Wald |
gr-qc/9305023 | Mass Formulas for Stationary Einstein-Yang-Mills Black Holes and a
Simple Proof of Two Staticity Theorems | We derive two new integral mass formulas for stationary black holes in
Einstein-Yang-Mills theory. From these we derive a formula for $ \J \Omega -Q V
$, from which it follows immediately that any stationary, nonrotating,
uncharged black hole is static and has vanishing electric field on the static
slices. In the Einst... | 1993-05-25 | 2010-01-06 | [
"gr-qc"
] | Daniel Sudarsky and Robert M. Wald |
gr-qc/9305022 | The First Law of Black Hole Mechanics | A simple proof of a strengthened form of the first law of black hole
mechanics is presented. The proof is based directly upon the Hamiltonian
formulation of general relativity, and it shows that the the first law
variational formula holds for arbitrary nonsingular, asymptotically flat
perturbations of a stationary, axi... | 1993-05-25 | 2007-05-23 | [
"gr-qc"
] | Robert M. Wald |
gr-qc/9305021 | Gravitational waves in general relativity: XIV. Bondi expansions and the
``polyhomogeneity'' of \Scri | The structure of polyhomogeneous space-times (i.e., space-times with metrics
which admit an expansion in terms of $r^{-j}\log^i r$) constructed by a
Bondi--Sachs type method is analysed. The occurrence of some log terms in an
asymptotic expansion of the metric is related to the non--vanishing of the Weyl
tensor at Scri... | 1993-05-25 | 2015-06-25 | [
"gr-qc"
] | Piotr T. Chrusciel, Malcolm A.H. MacCallum and David B. Singleton |
gr-qc/9305018 | Anomalous Fermion Production in Gravitational Collapse | The Dirac equation is solved in the Einstein-Yang-Mills background found by
Bartnik and McKinnon. We find a normalizable zero-energy fermion mode in the
$s$-wave sector. As shown recently, their solution corresponds to a
gravitational sphaleron which mediates transitions between topologically
distinct vacua. Since the ... | 1993-05-24 | 2009-10-07 | [
"gr-qc",
"hep-th"
] | G.W. Gibbons and Alan R. Steif |
gr-qc/9305020 | Six ways to quantize (2+1)-dimensional gravity | We do not yet know how to quantize gravity in 3+1 dimensions, but in lower
dimensions we face the opposite problem: many of the approaches originally
developed for (3+1)-dimensional gravity can be successfully implemented in 2+1
dimensions, but the resulting quantum theories are not all equivalent. In this
talk, I disc... | 1993-05-24 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | S. Carlip |
gr-qc/9305017 | Topological Censorship | All three-manifolds are known to occur as Cauchy surfaces of asymptotically
flat vacuum spacetimes and of spacetimes with positive-energy sources. We prove
here the conjecture that general relativity does not allow an observer to probe
the topology of spacetime: any topological structure collapses too quickly to
allow ... | 1993-05-23 | 2009-10-22 | [
"gr-qc"
] | John L. Friedman, Kristin Schleich, and Donald M. Witt |
gr-qc/9305019 | New Restrictions on Spatial Topology of the Universe from Microwave
Background Temperature Fluctuations | If the Universe has the topology of a 3-torus ($T^3$), then it follows from
recent data on large-scale temperature fluctuations $\Delta T/T$ of the cosmic
microwave background that either the minimal size of the torus is at least of
the order of the present cosmological horizon, or the large-scale $\Delta T/T$
pattern ... | 1993-05-23 | 2007-05-23 | [
"gr-qc",
"astro-ph"
] | A.A. Starobinsky |
gr-qc/9305014 | Can Gravitational Waves Prevent Inflation? | To investigate the cosmic no hair conjecture, we analyze numerically
1-dimensional plane symmetrical inhomogeneities due to gravitational waves in
vacuum spacetimes with a positive cosmological constant. Assuming periodic
gravitational pulse waves initially, we study the time evolution of those waves
and the nature of ... | 1993-05-18 | 2010-11-01 | [
"gr-qc"
] | Hisa-aki SHINKAI and Kei-ichi MAEDA |
gr-qc/9305016 | Initial conditions and unitarity in unimodular quantum cosmology | We consider quantization of the positive curvature Friedmann cosmology in the
unimodular modification of Einstein's theory, in which the spacetime
four-volume appears as an explicit time variable. The Hamiltonian admits
self-adjoint extensions that give unitary evolution in the Hilbert space
associated with the Schr\"o... | 1993-05-18 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | Alan Daughton, Jorma Louko, and Rafael D. Sorkin |
gr-qc/9305015 | An illustration of 2+1 gravity loop transform troubles | A nonperturbative approach to quantum gravity that has generated much
discussion is the attempt to construct a ``loop representation." Despite it's
success in linear quantum theories and a part of 2+1 quantum gravity, it has
recently been noticed that difficulties arise with loop representations in a
different ``sector... | 1993-05-18 | 2007-05-23 | [
"gr-qc"
] | Donald Marolf |
gr-qc/9305013 | Massless Minimally Coupled Fields in De Sitter Space: O(4)-Symmetric
States Versus De Sitter Invariant Vacuum | The issue of de Sitter invariance for a massless minimally coupled scalar
field is revisited. Formally, it is possible to construct a de Sitter invariant
state for this case provided that the zero mode of the field is quantized
properly. Here we take the point of view that this state is physically
acceptable, in the se... | 1993-05-16 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Klaus Kirsten and Jaume Garriga |
gr-qc/9305012 | Quantum Mechanics, Common Sense and the Black Hole Information Paradox | The purpose of this paper is to analyse, in the light of information theory
and with the arsenal of (elementary) quantum mechanics (EPR correlations,
copying machines, teleportation, mixing produced in sub-systems owing to a
trace operation, etc.) the scenarios available on the market to resolve the
so-called black-hol... | 1993-05-14 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Ulf H. Danielsson and Marcelo Schiffer |
gr-qc/9305011 | Actions for Gravity, with Generalizations: A Review | Related to the classical Ashtekar Hamiltonian, there have been discoveries
regarding new classical actions for gravity in (2+1)- and (3+1)-dimensions, and
also generalizations of Einstein's theory of gravity. In this review, I will
try to clarify the relations between the new and old actions for gravity, and
also give ... | 1993-05-13 | 2010-04-06 | [
"gr-qc"
] | Peter Peldan |
gr-qc/9305010 | Singularity Free Inhomogeneous Models with Heat Flow | We present a class of singularity free exact cosmological solutions of
Einstein's equations describing a perfect fluid with heat flow. It is obtained
as generalization of the Senovilla class [1] corresponding to incoherent
radiation field. The spacetime is cylindrically symmetric and globally regular. | 1993-05-12 | 2010-04-06 | [
"gr-qc"
] | L. K. Patel and Naresh Dadhich |
gr-qc/9305009 | On the Distributional Nature of the Energy Momentum Tensor of a Black
Hole or What Curves the Schwarzschild Geometry ? | Using distributional techniques we calculate the energy--momentum tensor of
the Schwarzschild geometry. It turns out to be a well--defined
tensor--distribution concentrated on the $r=0$ region which is usually excluded
from space--time. This provides a physical interpretation for the curvature of
this geometry. | 1993-05-10 | 2009-10-22 | [
"gr-qc"
] | Herbert Balasin, Herbert Nachbagauer |
gr-qc/9305008 | Canonical Quantization of Gravitating Point Particles in 2+1 Dimensions | A formalism previously introduced by the author using tesselated Cauchy
surfaces is applied to define a quantized version of gravitating point
particles in 2+1 dimensions. We observe that this is the first model whose
quantum version automatically discretizes time. But also spacelike distances
are discretized in a very... | 1993-05-10 | 2010-04-06 | [
"gr-qc"
] | Gerard 't Hooft |
gr-qc/9305006 | The Quantum Sphaleron | A gravitational instanton is found that can tunnel into a new more stable
vacuum phase where diffeomorphism invariance is broken and pitchfork
bifurcations develop. This tunnelling process involves a double sphaleron-like
transition which is associated with an extra level of quantization which is
above that is containe... | 1993-05-07 | 2009-10-22 | [
"gr-qc"
] | P.F. Gonzalez-Diaz |
gr-qc/9305007 | Average Entropy of a Subsystem | If a quantum system of Hilbert space dimension $mn$ is in a random pure
state, the average entropy of a subsystem of dimension $m\leq n$ is conjectured
to be $S_{m,n}=\sum_{k=n+1}^{mn}\frac{1}{k}-\frac{m-1}{2n}$ and is shown to be
$\simeq \ln m - \frac{m}{2n}$ for $1\ll m\leq n$. Thus there is less than
one-half unit o... | 1993-05-07 | 2014-11-17 | [
"gr-qc",
"hep-th"
] | Don N. Page |
gr-qc/9305005 | Cosmological Constant and Gravitational Repulsion Effect: 1. Homogeneous
models with radiation | Within the framework of the minimum quadratic Poincare gauge theory of
gravity in the Riemann-Cartan spacetime we study the influence of gravitational
vacuum energy density (a cosmological constant) on the dynamics of various
gravitating systems. It is shown that the inclusion of the cosmological term
can lead to gravi... | 1993-05-06 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Nguyen Hong Chuong and Nguyen Van Hoang |
gr-qc/9305004 | Form Connections | Riemannian geometry in four dimensions naturally leads to an SL(3) connection
that annihilates a basis for self-dual two-forms. Einstein's equations may be
written in terms of an SO(3) connection, with SO(3) chosen as an appropriate
subgroup of SL(3). We show how a set of "neighbours" of Einstein's equations
arises bec... | 1993-05-05 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | Ingemar Bengtsson |
gr-qc/9305002 | Gravitational form factors of the neutrino | The gravitational properties of the neutrino is studied in the weak field
approximation. By imposing the hermiticity condition, CPT and CP invariance on
the \em tensor matrix element, we shown that the allowed gravitational form
factors for Dirac and Majorana neutrinos are very different. In a CPT and CP
invariant theo... | 1993-05-03 | 2009-10-22 | [
"gr-qc"
] | K. L. Ng |
gr-qc/9305003 | Holomorphic quantum mechanics with a quadratic Hamiltonian constraint | A finite dimensional system with a quadratic Hamiltonian constraint is Dirac
quantized in holomorphic, antiholomorphic and mixed representations. A unique
inner product is found by imposing Hermitian conjugacy relations on an operator
algebra. The different representations yield drastically different Hilbert
spaces. In... | 1993-05-03 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | Jorma Louko |
gr-qc/9305001 | About a Super-Ashtekar-Renteln Ansatz | The Ashtekar-Renteln Ansatz gives the self-dual solutions to the Einstein
equation. A direct generalization of the Ashtekar-Renteln An\-satz to N=1
supergravity is given both in the canonical and in the covariant formulation
and a geometrical property of the solutions is pointed out. (Changes: the
covariant formulation... | 1993-05-03 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | G\'eza F\"ul\"op |
gr-qc/9304047 | Invariant Connections with Torsion on Group Manifolds and Their
Application in Kaluza-Klein Theories | Invariant connections with torsion on simple group manifolds $S$ are studied
and an explicit formula describing them is presented. This result is used for
the dimensional reduction in a theory of multidimensional gravity with
curvature squared terms on $M^{4} \times S$. We calculate the potential of
scalar fields, emer... | 1993-05-02 | 2009-10-22 | [
"gr-qc"
] | Yu. A. Kubyshin, V. O. Malyshenko, and D. Marin Ricoy |
gr-qc/9304046 | Unique Quantum Paths by Continuous Diagonalization of the Density
Operator | In this short note we show that for a Markovian open quantum system it is
always possible to construct a unique set of perfectly consistent Schmidt
paths, supporting quasi-classicality. Our Schmidt process, elaborated several
years ago, is the $\Delta t\to 0$ limit of the Schmidt chain constructed very
recently by Paz ... | 1993-05-01 | 2007-05-23 | [
"gr-qc"
] | Lajos Diosi |
gr-qc/9304044 | Completeness of Wilson loop functionals on the moduli space of $SL(2,C)$
and $SU(1,1)$-connections | The structure of the moduli spaces $\M := \A/\G$ of (all, not just flat)
$SL(2,C)$ and $SU(1,1)$ connections on a n-manifold is analysed. For any
topology on the corresponding spaces $\A$ of all connections which satisfies
the weak requirement of compatibility with the affine structure of $\A$, the
moduli space $\M$ is... | 1993-04-30 | 2010-04-06 | [
"gr-qc"
] | Abhay Ashtekar and Jerzy Lewandowski |
gr-qc/9304045 | Functional Change of Variables in the Wheeler--De Witt Equation | I present a new way to solve the Wheeler--de Witt equation using the
invariance of the classical lagrangian under reparametrization. This property
allows one to introduce an arbitrary function for each degree of freedom of the
wave function $\Psi$: this arbitrariness can be used to fix the asymptotic
behaviour of $\Psi... | 1993-04-30 | 2007-05-23 | [
"gr-qc"
] | Marco Cavagli\`a |
gr-qc/9304043 | An algebraic approach to the quantization of cosntrained systems: finite
dimensional examples | From the point of view of canonical quantum gravity, it has become imperative
to find a framework for quantization which provides a {\em general}
prescription to find the physical inner product, and is flexible enough to
accommodate non-canonical variables. In this dissertation I consider an
algebraic formulation of th... | 1993-04-30 | 2016-08-31 | [
"gr-qc"
] | Ranjeet S. Tate, (Ph.D. Dissertation, Syracuse University) |
gr-qc/9304042 | On the Definition of Averagely Trapped Surfaces | Previously suggested definitions of averagely trapped surfaces are not
well-defined properties of 2-surfaces, and can include surfaces in flat
space-time. A natural definition of averagely trapped surfaces is that the
product of the null expansions be positive on average. A surface is averagely
trapped in the latter se... | 1993-04-29 | 2010-04-06 | [
"gr-qc"
] | Sean A. Hayward |
gr-qc/9304041 | Non-Perturbative Canonical Quantization of Minisuperspace Models:
Bianchi Types I and II | We carry out the quantization of the full type I and II Bianchi models
following the non-perturbative canonical quantization program. These
homogeneous minisuperspaces are completely soluble, i.e., it is possible to
obtain the general solution to their classical equations of motion in an
explicit form. We determine the... | 1993-04-29 | 2010-11-01 | [
"gr-qc"
] | Nenad Manojlovic and Guillermo A. Mena Marugan |
gr-qc/9304040 | Saddle points of stringy action | It is shown that Einstein-Yang-Mills-dilaton theory has a countable family of
static globally regular solutions which are purely magnetic but uncharged. The
discrete spectrum of masses of these solutions is bounded from above by the
mass of extremal Gibbons-Maeda solution. As follows from linear stability
analysis all ... | 1993-04-28 | 2007-05-23 | [
"gr-qc"
] | Piotr Bizon |
gr-qc/9304039 | Quantum-Mechanical Histories and the Uncertainty Principle:
I.Information-Theoretic Inequalities | This paper is generally concerned with understanding how the uncertainty
principle arises in formulations of quantum mechanics, such as the decoherent
histories approach, whose central goal is the assignment of probabilities to
histories. We first consider histories characterized by position or momentum
projections at ... | 1993-04-27 | 2009-10-22 | [
"gr-qc",
"cond-mat",
"hep-th"
] | J.J.Halliwell |
gr-qc/9304038 | Comment on Consistent Interpretation of Quantum Mechanics Using Quantum
Trajectories | Recently, Griffiths presented a generalization of the consistent history
approach to quantum mechanics. I can easily construct all possible complete
families satisfying Griffiths' "noninterference conditions". Since only trivial
families exist one may conclude that Griffiths' proposal has not got farther
than the ordin... | 1993-04-27 | 2007-05-23 | [
"gr-qc"
] | Lajos Diosi |
gr-qc/9304037 | Calculation of X-Ray Signals from Karolyhazy Hazy Space-Time | Karolyhazy's hazy space-time model, invented for breaking down macroscopic
interferences, employs wave-like gravity disturbances. If so, then electric
charges would radiate permanently. Here we discuss the observational
consequences of the radiation. We find that such radiation is excluded by
common experimental situat... | 1993-04-24 | 2007-05-23 | [
"gr-qc"
] | L. Diosi and B. Lukacs |
gr-qc/9304036 | The Cayley-Hamilton theorem for supermatrices | Starting from the expression for the superdeterminant of (xI-M), where M is
an arbitrary supermatrix, we propose a definition for the corresponding
characteristic polynomial and we prove that each supermatrix satisfies its
characteristic equation. Depending upon the factorization properties of the
basic polynomials who... | 1993-04-22 | 2009-10-22 | [
"gr-qc"
] | Luis Urrutia and N. Morales |
gr-qc/9304034 | Trapped Surfaces in Vacuum Spacetimes | An earlier construction by the authors of sequences of globally regular,
asymptotically flat initial data for the Einstein vacuum equations containing
trapped surfaces for large values of the parameter is extended, from the time
symmetric case considered previously, to the case of maximal slices. The
resulting theorem ... | 1993-04-22 | 2010-04-06 | [
"gr-qc"
] | R. Beig (Institut f\"ur Theoretische Physik Universit\"at Wien), N.
\'O Murchadha (Physics Department, University College Cork, Ireland) |
gr-qc/9304035 | Non-standard phase space variables, quantization, and path integrals, or
little ado about much | Contribution to the Misner Festshrift, no abstract. | 1993-04-22 | 2007-05-23 | [
"gr-qc"
] | Michael P. Ryan and Sergio Hojman |
gr-qc/9304033 | Perturbations of a topological defect as a theory of scalar fields
interacting with an external vector potential | This is a revised version of gr-qc/9304033 | 1993-04-21 | 2009-10-22 | [
"gr-qc"
] | Jemal Guven |
gr-qc/9304032 | Covariant perturbations of domain walls in curved spacetime | A manifestly covariant equation is derived to describe the perturbations in a
domain wall on a given background spacetime. This generalizes recent work on
domain walls in Minkowski space and introduces a framework for examining the
stability of relativistic bubbles in curved spacetimes. | 1993-04-21 | 2009-10-22 | [
"gr-qc"
] | Jemal Guven |
gr-qc/9304029 | On completeness of orbits of Killing vector fields | A Theorem is proved which reduces the problem of completeness of orbits of
Killing vector fields in maximal globally hyperbolic, say vacuum, space--times
to some properties of the orbits near the Cauchy surface. In particular it is
shown that all Killing orbits are complete in maximal developements of
asymptotically fl... | 1993-04-21 | 2010-04-06 | [
"gr-qc"
] | Piotr T. Chrusciel |
gr-qc/9304031 | Environment--Induced Decoherence, Classicality and Consistency of
Quantum Histories | We prove that for an open system, in the Markovian regime, it is always
possible to construct an infinite number of non trivial sets of histories that
exactly satisfy the probability sum rules. In spite of being perfectly
consistent, these sets manifest a very non--classical behavior: they are quite
unstable under the ... | 1993-04-20 | 2010-11-01 | [
"gr-qc"
] | Juan Pablo Paz and Wojciech Hubert Zurek |
gr-qc/9304028 | Static solutions of the spherically symmetric Vlasov-Einstein system | The Vlasov-Einstein system describes the evolution of an ensemble of
particles (such as stars in a galaxy, galaxies in a galaxy cluster etc.)
interacting only by the gravitational field which they create collectively and
which obeys Einstein's field equations. The matter distribution is described by
the Vlasov or Liouv... | 1993-04-20 | 2015-06-25 | [
"gr-qc"
] | Gerhard Rein |
gr-qc/9304030 | On the limits of Brans-Dicke spacetimes: a coordinate-free approach | We investigate the limit of Brans-Dicke spacetimes as the scalar field
coupling constant omega tends to infinity applying a coordinate-free technique.
We obtain the limits of some known exact solutions. It is shown that these
limits may not correspond to similar solutions in the general relativity
theory. | 1993-04-20 | 2010-11-01 | [
"gr-qc"
] | F. M. Paiva and C. Romero |
gr-qc/9304026 | Action functionals for relativistic perfect fluids | Action functionals describing relativistic perfect fluids are presented. Two
of these actions apply to fluids whose equations of state are specified by
giving the fluid energy density as a function of particle number density and
entropy per particle. Other actions apply to fluids whose equations of state
are specified ... | 1993-04-19 | 2010-04-06 | [
"gr-qc"
] | David Brown |
gr-qc/9304024 | Operative Time Definition and Principal Uncertainity | Arguments are given that time must be defined in an operative manner,i.e., by
constructing devices which can serve as clocks.The investigation of such
devices leads to the conclusion that there is a principal uncertainity of time
if one considers periods which are not large compared with the Planck time.
Thus,according... | 1993-04-19 | 2007-05-23 | [
"gr-qc"
] | Martin Schoen |
gr-qc/9304027 | No Time Asymmetry from Quantum Mechanics | With CPT-invariant initial conditions that commute with CPT-invariant final
conditions, the respective probabilities (when defined) of a set of histories
and its CPT reverse are equal, giving a CPT-symmetric universe. This leads me
to question whether the asymmetry of the Gell-Mann--Hartle decoherence
functional for or... | 1993-04-19 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Don N. Page |
gr-qc/9304025 | An Information-Theoretic Measure of Uncertainty due to Quantum and
Thermal Fluctuations | We study an information-theoretic measure of uncertainty for quantum systems.
It is the Shannon information $I$ of the phase space probability distribution
$\la z | \rho | z \ra $, where $|z \ra $ are coherent states, and $\rho$ is the
density matrix. The uncertainty principle is expressed in this measure as $I
\ge 1$.... | 1993-04-18 | 2009-10-22 | [
"gr-qc",
"cond-mat",
"hep-th"
] | Arlen Anderson and Jonathan J. Halliwell |
gr-qc/9304023 | Time Symmetry and Asymmetry in Quantum Mechanics and Quantum Cosmology | We investigate the origin of the arrow of time in quantum mechanics in the
context of quantum cosmology. The ``Copenhagen'' quantum mechanics of measured
subsystems incorporates a fundamental arrow of time. Extending discussions of
Aharonov, Bergmann and Lebovitz, Griffiths, and others we investigate a
generalized quan... | 1993-04-18 | 2009-09-25 | [
"gr-qc",
"hep-th"
] | Murray Gell-Mann and James B. Hartle |
gr-qc/9304021 | Nonlinear evolution of density perturbations using approximate constancy
of gravitational potential | During the evolution of density inhomogeneties in an $\Omega=1$, matter
dominated universe, the typical density contrast changes from $\delta\simeq
10^{-4}$ to $\delta\simeq 10^2$. However, during the same time, the typical
value of the gravitational potential generated by the perturbations changes
only by a factor of ... | 1993-04-16 | 2019-08-17 | [
"gr-qc"
] | J.S.Bagla, T.Padmanabhan |
gr-qc/9304022 | Scaling properties of the gravitational clustering in the nonlinear
regime | The growth of density perturbations in an expanding universe in the
non-linear regime is investigated. The underlying equations of motion are cast
in a suggestive form, and motivate a conjecture that the scaled pair velocity,
$h(a,x)\equiv -[v/(\dot{a}x)]$ depends on the expansion factor $a$ and comoving
coordinate $x$... | 1993-04-16 | 2015-06-25 | [
"gr-qc"
] | R.Nityananda, T.Padmanabhan |
gr-qc/9304020 | Gravitational Radiation, Inspiraling Binaries, and Cosmology | We show how to measure cosmological parameters using observations of
inspiraling binary neutron star or black hole systems in one or more
gravitational wave detectors. To illustrate, we focus on the case of fixed mass
binary systems observed in a single Laser Interferometer Gravitational-wave
Observatory (LIGO)-like de... | 1993-04-15 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | David F. Chernoff, Lee Samuel Finn |
gr-qc/9304019 | On ``hyperboloidal'' Cauchy data for vacuum Einstein equations and
obstructions to smoothness of ``null infinity'' | Various works have suggested that the Bondi--Sachs--Penrose decay conditions
on the gravitational field at null infinity are not generally representative of
asymptotically flat space--times. We have made a detailed analysis of the
constraint equations for ``asymptotically hyperboloidal'' initial data and find
that log ... | 1993-04-15 | 2009-10-22 | [
"gr-qc"
] | Lars Andersson, Piotr T. Chrusciel |
gr-qc/9304017 | Condensation of Matter and Trapped Surfaces in Quasi-Polar Gauge | We continue the investigation of formation of trapped surfaces in strongly
curved , conformally flat geometries. Initial data in quasi-polar gauges rather
then maximal ones are considered. This implies that apparent horizons coincide
with minimal surfaces. Necessary and sufficient conditions for the formation of
trappe... | 1993-04-14 | 2007-05-23 | [
"gr-qc"
] | Piotr Koc |
gr-qc/9304018 | Relic Gravitational Waves and Limits on Inflation | It is shown that only a narrow class of inflationary models can possibly
agree with the available observational data on the anisotropy of the cosmic
microwave background radiation (CMBR). These models may be governed by
``matter'' with the effective equation of state $-1.2 <p/ \epsilon < -0.6$
which includes the De-Sit... | 1993-04-14 | 2009-10-22 | [
"gr-qc"
] | L. P. Grishchuk |
gr-qc/9304015 | Stationary Universe | If the Universe contains at least one inflationary domain with a sufficiently
large and homogeneous scalar field, then this domain permanently produces new
inflationary domains of all possible types. We show that under certain
conditions this process of the self-reproduction of the Universe can be
described by a statio... | 1993-04-13 | 2009-09-29 | [
"gr-qc",
"astro-ph",
"hep-ph"
] | Andrei Linde and Arthur Mezhlumian |
gr-qc/9304016 | Unique family of consistent histories in the Caldeira-Leggett model | Based on the standard statistical interpretation of mixed quantum states, a
unique family of consistent histories has been constructed for the quantum
Brownian motion in the Caldeira-Leggett reservoir. Analytic solutions have been
shown in the Markovian regime: they are uniquely defined coherent wave packets
travelling... | 1993-04-13 | 2008-02-03 | [
"gr-qc"
] | Lajos Diosi |
gr-qc/9304014 | The Fourth Root of Gravity | By attaching basis vectors to the components of matter fields, one may render
free action densities fully covariant. Both the connection and the tetrads are
quadratic forms in these basis vectors. The metric of spacetime, which is
quadratic in the tetrads, is then quartic in the basis vectors. | 1993-04-12 | 2007-05-23 | [
"gr-qc"
] | Kevin Cahill |
gr-qc/9304013 | Gurses' Type (b) Transformations are Neighborhood-Isometries | Following an idea close to one given by C. G. Torre (private communication),
we prove that Riemannian spaces (M,g) and (M,h) that are related by a Gurses
type (b) transformation [M. Gurses, Phys. Rev. Lett. 70, 367 (1993)] or,
equivalently, by a Torre-Anderson generalized diffeomorphism [C. G. Torre and
I. M. Anderson,... | 1993-04-09 | 2009-10-22 | [
"gr-qc"
] | I. Hauser and F. J. Ernst |
gr-qc/9304012 | Canonical Quantum Gravity | This is a review of the aspirations and disappointments of the canonical
quantization of geometry. I compare the two chief ways of looking at canonical
gravity, geometrodynamics and connection dynamics. I capture as much of the
classical theory as I can by pictorial visualization. Algebraic aspects
dominate my descript... | 1993-04-08 | 2007-05-23 | [
"gr-qc"
] | Karel Kuchar |
gr-qc/9304011 | Can quantum wormholes set $Lam$ 0 | We find the quantum analogues of Carlini-Mijic wormholes and consider their
application to the cosmological constant problem. In a simple model with
$\Lambda$ only we differ with the results of Strominger. | 1993-04-08 | 2007-05-23 | [
"gr-qc"
] | D.H. Coule and D. Solomons |
gr-qc/9304010 | General covariance, loops and matter | A four dimensional generally covariant field theory is presented which
describes non-dynamical three geometries coupled to scalar fields. The theory
has an infinite number of physical observables (or constants of the motion)
which are constructed from loops made from scalar field configurations. The
Poisson algebra of ... | 1993-04-08 | 2009-10-22 | [
"gr-qc"
] | Viqar Husain |
gr-qc/9304009 | Maximal Hypersurfaces in Asymptotically Stationary Space-Times | Existence of maximal hypersurfaces and of foliations by maximal hypersurfaces
is proven in two classes of asymptotically flat spacetimes which possess a one
parameter group of isometries whose orbits are timelike ``near infinity''. The
first class consists of strongly causal asymptotically flat spacetimes which
contain... | 1993-04-07 | 2015-06-25 | [
"gr-qc"
] | P.T.Chrusciel, R.Wald |
gr-qc/9304007 | Global Structure of a Black-Hole Cosmos and its Extremes | We analyze the global structure of a family of Einstein-Maxwell solutions
parametrized by mass, charge and cosmological constant. In a qualitative
classification there are: (i) generic black-hole solutions, describing a
Wheeler wormhole in a closed cosmos of spatial topology $S^2\times S^1$; (ii)
generic naked-singular... | 1993-04-06 | 2010-04-06 | [
"gr-qc"
] | Dieter R. Brill and Sean A. Hayward |
gr-qc/9304008 | Semiclassical Gravity Theory and Quantum Fluctuations | We discuss the limits of validity of the semiclassical theory of gravity in
which a classical metric is coupled to the expectation value of the stress
tensor. It is argued that this theory is a good approximation only when the
fluctuations in the stress tensor are small. We calculate a dimensionless
measure of these fl... | 1993-04-06 | 2010-11-01 | [
"gr-qc"
] | Chung-I Kuo and L. H. Ford |
gr-qc/9304006 | Spacetime Quantum Mechanics and the Quantum Mechanics of Spacetime | These are the author's lectures at the 1992 Les Houches Summer School,
"Gravitation and Quantizations". They develop a generalized sum-over-histories
quantum mechanics for quantum cosmology that does not require either a
preferred notion of time or a definition of measurement. The "post-Everett"
quantum mechanics of cl... | 1993-04-05 | 2014-01-15 | [
"gr-qc",
"hep-th"
] | James B. Hartle |
gr-qc/9304005 | A New Discretization of Classical and Quantum General Relativity | We propose a new discrete approximation to the Einstein equations, based on
the Capovilla-Dell-Jacobson form of the action for the Ashtekar variables. This
formulation is analogous to the Regge calculus in that the curvature has
support on sets of measure zero. Both a Lagrangian and Hamiltonian formulation
are proposed... | 1993-04-05 | 2008-02-03 | [
"gr-qc",
"hep-lat",
"hep-th"
] | O. Bostrom, M. Miller, L. Smolin |
gr-qc/9304004 | Proof of the Thin Sandwich Conjecture | We prove that the Thin Sandwich Conjecture in general relativity is valid,
provided that the data $(g_{ab},\dot g_{ab})$ satisfy certain geometric
conditions. These conditions define an open set in the class of possible data,
but are not generically satisfied. The implications for the ``superspace''
picture of the Eins... | 1993-04-04 | 2009-10-22 | [
"gr-qc"
] | Robert Bartnik and Gyula Fodor |
gr-qc/9304003 | Gravity-Wave Watching | It is suggested that gravity waves could, in several cases, be detected by
means of already (or shortly to be) available technology, independently of
current efforts of detection. The present is a follow-up on a recently
suggested detection strategy based on gravity-wave-induced deviations of null
geodesics. The new de... | 1993-04-02 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Redouane Fakir |
gr-qc/9304002 | Bianchi Cosmological Models in the Minimum Quadratic Poincare Gauge
Theory of Gravity | Within the framework of the minimum quadratic Poincare gauge theory of
gravity in the Riemann-Cartan spacetime the dynamics of homogeneous anisotropic
Bianchi types I-IX spinning-fluid cosmological models is investigated. A basic
equation set for these models is obtained and analyzed. In particular, exact
solutions for... | 1993-04-01 | 2007-05-23 | [
"gr-qc",
"astro-ph"
] | Nguyen Hong Chuong, and Nguyen Van Hoang |
gr-qc/9304001 | Cosmological Perturbations of Quantum-Mechanical Origin and Anisotropy
of the Microwave Background | Cosmological perturbations generated quantum-mechanically (as a particular
case, during inflation) possess statistical properties of squeezed quantum
states. The power spectra of the perturbations are modulated and the angular
distribution of the produced temperature fluctuations of the CMBR is quite
specific. An exact... | 1993-04-01 | 2009-10-22 | [
"gr-qc"
] | L. P. Grishchuk |
gr-qc/9303038 | Motion of Inertial Observers Through Negative Energy | Recent research has indicated that negative energy fluxes due to quantum
coherence effects obey uncertainty principle-type inequalities of the form
$|\Delta E|\,{\Delta \tau} \lprox 1\,$. Here $|\Delta E|$ is the magnitude of
the negative energy which is transmitted on a timescale $\Delta \tau$. Our main
focus in this ... | 1993-03-31 | 2009-10-22 | [
"gr-qc"
] | L.H. Ford and Thomas A. Roman |
gr-qc/9303037 | Naked Singularities in Spherically Symmetric Inhomogeneous Tolman-Bondi
Dust Cloud Collapse | We investigate the occurrence and nature of naked singularity for the
inhomogeneous gravitational collapse of Tolman-Bondi dust clouds.It is shown
that the naked singularities form at the center of the collapsing cloud in a
wide class of collapse models which includes the earlier cases considered by
Eardley and Smarr a... | 1993-03-31 | 2009-10-22 | [
"gr-qc"
] | P.S.Joshi and I.H.Dwivedi |
gr-qc/9303035 | Exotic Black Holes? | Exotic smooth manifolds, ${\bf R^2\times_\Theta S^2}$, are constructed and
discussed as possible space-time models supporting the usual Kruskal
presentation of the vacuum Schwarzschild metric locally, but {\em not
globally}. While having the same topology as the standard Kruskal model, none
of these manifolds is diffeo... | 1993-03-30 | 2016-08-31 | [
"gr-qc"
] | Carl H. Brans |
gr-qc/9303036 | Decoherence Functional and Inhomogeneities in the Early Universe | We investigate the quantum to classical transition of small inhomogeneous
fluctuations in the early Universe using the decoherence functional of
Gell-Mann and Hartle. We study two types of coarse graining; one due to coarse
graining the value of the scalar field and the other due to summing over an
environment. We comp... | 1993-03-30 | 2009-10-22 | [
"gr-qc"
] | R. Laflamme and A. Matacz |
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