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/9309019 | Dirac spinor in a nonstationary Godel-type cosmological Universe | In the present article we solve, via separation of variables, the massless
Dirac equation in a nonstationary rotating, causal G\"odel-type cosmological
universe, having a constant rotational speed in all the points of the space. We
compute the frequency spectrum. We show that the spectrum of massless Dirac
particles is... | 1993-09-16 | 2015-06-25 | [
"gr-qc"
] | Victor M. Villalba |
gr-qc/9309018 | Exact Dirac Quantization of All 2-D Dilaton Gravity Theories | The most general dilaton gravity theory in 2 spacetime dimensions is
considered. A Hamiltonian analysis is performed and the reduced phase space,
which is two dimensional, is explicitly constructed in a suitable
parametrization of the fields. The theory is then quantized via the Dirac
method in a functional Schrodinger... | 1993-09-15 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | D. Louis- Martinez, J. Gegenberg, G. Kunstatter |
gr-qc/9309016 | The Collision of Two Black Holes | We study the head-on collision of two equal mass, nonrotating black holes. We
consider a range of cases from holes surrounded by a common horizon to holes
initially separated by about $20M$, where $M$ is the mass of each hole. We
determine the waveforms and energies radiated for both the $\ell = 2$ and
$\ell=4$ waves r... | 1993-09-14 | 2016-08-31 | [
"gr-qc"
] | Peter Anninos, David Hobill, Edward Seidel, Larry Smarr and Wai-Mo
Suen |
gr-qc/9309013 | Exponential-Potential Scalar Field Universes I: The Bianchi I Models | We obtain a general exact solution of the Einstein field equations for the
anisotropic Bianchi type I universes filled with an exponential-potential
scalar field and study their dynamics. It is shown, in agreement with previous
studies, that for a wide range of initial conditions the late-time behaviour of
the models i... | 1993-09-14 | 2010-11-01 | [
"gr-qc"
] | J.M. Aguirregabiria, A. Feinstein and J. Ibanez |
gr-qc/9309014 | Exponential-Potential Scalar Field Universes II: The Inhomogeneous
Models | We obtain exact solutions for the Einstein equations with an
exponential-potential scalar field (\(V=\Lambda e^{k\phi}\)) which represent
simple inhomogeneous generalizations of Bianchi I cosmologies. Studying these
equations numerically we find that in most of the cases there is a certain
period of inflationary behavi... | 1993-09-14 | 2010-11-01 | [
"gr-qc"
] | J.M. Aguirregabiria, A. Feinstein and J. Ibanez |
gr-qc/9309015 | Formation of Solitonic Stars Through Gravitational Cooling | We studied the formation of compact bosonic objects through a dissipationless
cooling mechanism. Implications of the existence of this mechanism are
discussed, including the abundance of bosonic stars in the universe, and the
possibility of ruling out the axion as a dark matter candidate. | 1993-09-14 | 2008-11-26 | [
"gr-qc"
] | Edward Seidel and Wai-Mo Suen |
gr-qc/9309017 | Quantum Dynamics of Lorentzian Spacetime Foam | A simple spacetime wormhole, which evolves classically from zero throat
radius to a maximum value and recontracts, can be regarded as one possible mode
of fluctuation in the microscopic ``spacetime foam'' first suggested by
Wheeler. The dynamics of a particularly simple version of such a wormhole can
be reduced to that... | 1993-09-14 | 2009-10-22 | [
"gr-qc"
] | Ian Redmount and Wai-Mo Suen |
gr-qc/9309011 | Black Holes in Einstein-Lovelock Gravity | Static, spherically symmetric solutions of the field equations for a
particular dimensional continuation of general relativity with negative
cosmological constant are found. In even dimensions the solution has many
similarities with the \Sch\ metric. In odd dimensions, the equations of motion
are explicitly anti de-Sit... | 1993-09-13 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | Maximo Banados |
gr-qc/9309009 | Blackbody Distribution for Wormholes | By assuming that only (i) bilocal vertex operators which are diagonal with
respect to the basis for local field operators, and (ii) the convergent
elements with nonzero positive energy of the density matrix representing the
quantum state of multiply-connected wormholes, contribute the path integral
that describes the e... | 1993-09-13 | 2016-08-14 | [
"gr-qc"
] | P.F. Gonz\'alez-D\'iaz |
gr-qc/9309012 | Unitarity and Causality in Generalized Quantum Mechanics for Non-Chronal
Spacetimes | Spacetime must be foliable by spacelike surfaces for the quantum mechanics of
matter fields to be formulated in terms of a unitarily evolving state vector
defined on spacelike surfaces. When a spacetime cannot be foliated by spacelike
surfaces, as in the case of spacetimes with closed timelike curves, a more
general fo... | 1993-09-13 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | James B. Hartle |
gr-qc/9309008 | Quantum State and Spontaneous Symmetry Breaking in Gravity | A spontaneous symmetry breaking mechanism is used in quantum gravity to
obtain a convergent positive definite density-matrix as the most general
quantum state of Euclidean wormholes | 1993-09-13 | 2011-04-20 | [
"gr-qc"
] | Pedro F. Gonzalez-Diaz |
gr-qc/9309010 | The Dispersion of Newton's Constant: A Transfer Matrix Formulation of
Quantum Gravity | A transfer matrix formalism applicable to certain reparametrization invariant
theories, including quantum gravity, is proposed. In this formulation it is
found that every stationary state in quantum gravity satisfies a Wheeler-DeWitt
equation, but each with a different value of the Planck mass; the value
$m_{Planck}^4$... | 1993-09-13 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | J. Greensite |
gr-qc/9309007 | The Mixmaster Spacetime, Geroch's Transformation and Constants of Motion | We show that for $U(1)$-symmetric spacetimes on $S^3 \times R$ a constant of
motion associated with the well known Geroch transformation, a functional
$K[h_{ij},\pi^{ij}]$, quadratic in gravitational momenta, is strictly positive
in an open subset of the set of all $U(1)$-symmetric initial data, and
therefore not weakl... | 1993-09-09 | 2009-10-22 | [
"gr-qc"
] | Boro Grubisic and Vincent Moncrief |
gr-qc/9309006 | Physical States in d=3,N=2 Supergravity | To clarify some issues raised by D'Eath's recent proposal for the physical
states of $N=1$ supergravity in four dimensions, we study pure (topological)
$N=2$ supergravity in three dimensions, which is formally very similar, but
much easier to solve. The wave functionals solving the quantum constraints can
be understood... | 1993-09-09 | 2009-10-22 | [
"gr-qc"
] | B.de Wit (Utrecht University), H.J. Matschull and H. Nicolai (Hamburg
University) |
gr-qc/9309004 | A Cosmological Constant Limits the Size of Black Holes | In a space-time with cosmological constant $\Lambda>0$ and matter satisfying
the dominant energy condition, the area of a black or white hole cannot exceed
$4\pi/\Lambda$. This applies to event horizons where defined, i.e. in an
asymptotically deSitter space-time, and to outer trapping horizons (cf.
apparent horizons) ... | 1993-09-02 | 2009-10-22 | [
"gr-qc"
] | Sean A. Hayward, Tetsuya Shiromizu & Ken-ichi Nakao |
gr-qc/9309003 | MATTERS OF GRAVITY, a newsletter for the gravity community, number 2 | Table of contents:
Editorial 1
Correspondents 3
Some recent work in general relativistic Astrophysics 4
Two dimensional black holes 6
Resonant-mass gravitational wave detectors: an update 8
Universality and scaling in gravitational collapse 9
Gravitational Wave memories upgraded 11
Conference report: qu... | 1993-09-02 | 2007-05-23 | [
"gr-qc"
] | Jorge Pullin (Editor) |
gr-qc/9309001 | Dynamical Origin of the Entropy of a Black Hole | Modes of physical fields which are located inside a horizon and which cannot
be observed by a distant observer are identified with dynamical degrees of
freedom of a black hole. A new invariant statistical mechanical definition of a
black-hole's entropy is proposed. It is shown that the main contribution to the
entropy ... | 1993-09-02 | 2021-01-05 | [
"gr-qc"
] | Valery Frolov and Igor Novikov |
gr-qc/9309002 | Notes on the (2+1)-Dimensional Wheeler-DeWitt Equation | In contrast to other approaches to (2+1)-dimensional quantum gravity, the
Wheeler-DeWitt equation appears to be too complicated to solve explicitly, even
for simple spacetime topologies. Nevertheless, it is possible to obtain a good
deal of information about solutions and their interpretation. In particular,
strong evi... | 1993-09-02 | 2010-04-28 | [
"gr-qc"
] | Steven Carlip |
gr-qc/9309005 | Wigner function and quantum kinetic theory in curved space-time and
external fields | A new definition of the Wigner function for quantum fields coupled to curved
space--time and an external Yang--Mills field is studied on the example of a
scalar and a Dirac fields. The definition uses the formalism of the tangent
bundles and is explicitly covariant and gauge invariant. Derivation of
collisionless quant... | 1993-09-02 | 2010-11-01 | [
"gr-qc"
] | Oleg A. Fonarev |
gr-qc/9308032 | The Quantum Stress Tensor in the Three Dimensional Black Hole | The quantum stress tensor $<T_{\mu\nu}>$ is calculated in the 2+1 dimensional
black hole found by Banados, Teitelboim, and Zanelli. The Greens function, from
which $<T_{\mu\nu}> $ is derived, is obtained by the method of images. For the
non-rotating black hole, it is shown that $<T_{\mu\nu}>$ is finite on the event
hor... | 1993-08-27 | 2016-08-31 | [
"gr-qc",
"hep-th"
] | Alan R. Steif |
gr-qc/9308031 | Local Structure of Numerically Generated Worm Hole Spacetime | We investigate the evolution of the apparent horizons in a numerically
gererated worm hole spacetime. The behavior of the apparent horizons is
affected by the dynamics of the matter field. By using the local mass of the
system, we interpret the evolution of the worm hole structure. Figures are
available by mail to auth... | 1993-08-27 | 2007-05-23 | [
"gr-qc",
"astro-ph"
] | Yasusada Nambu and Masaru Siino |
gr-qc/9308030 | Fate of Inhomogeneity in Schwarzschild-deSitter Space-time | We investigate the global structure of the space time with a spherically
symmetric inhomogeneity using a metric junction, and classify all possible
types. We found that a motion with a negative gravitational mass is possible
although the energy condition of the matter is not violated. Using the result,
formation of bla... | 1993-08-27 | 2010-11-19 | [
"gr-qc",
"astro-ph"
] | Yasusada Nambu |
gr-qc/9308028 | Selfgravitating Yang-Mills solitons and their Chern-Simons numbers | We present a classification of the possible regular, spherically symmetric
solutions of the Einstein-Yang-Mills system which is based on a bundle
theoretical analysis for arbitrary gauge groups. It is shown that such solitons
must be of magnetic type, at least if the magnetic Yang-Mills charge vanishes.
Explicit expres... | 1993-08-26 | 2010-11-01 | [
"gr-qc"
] | O. Brodbeck and N. Straumann |
gr-qc/9308029 | Quantum Fluctuations of Black Hole Geometry | By using the minisuperspace model for the interior metric ofstatic black
holes, we solve the Wheeler-DeWitt equation to study quantum mechanics of the
horizon geometry. Our basic idea is to introduce the gravitational mass and the
expansions of null rays as quantum operators. Then, the exact wave function is
found as a... | 1993-08-26 | 2017-02-01 | [
"gr-qc",
"hep-th"
] | K.Nakamura, S.Konno, Y.Shiro, A.Tomimatsu |
gr-qc/9308026 | Nicolai Maps for Quantum Cosmology | We construct Nicolai maps for $N=2$ supersymmetric extensions of
minisuperspace models. It is shown that Nicolai maps exist for only a very
restricted set of states. In the models considered these are the two states
corresponding to the empty and the filled fermion sectors. The form of the
Nicolai maps in these sectors... | 1993-08-24 | 2009-10-22 | [
"gr-qc"
] | R. Graham and H. Luckock |
gr-qc/9308027 | New Types of Thermodynamics from $(1+1)$-Dimensional Black Holes | For normal thermodynamic systems superadditivity $\S$, homogeneity $\H$ and
concavity $\C$ of the entropy hold, whereas for $(3+1)$-dimensional black holes
the latter two properties are violated. We show that $(1+1)$-dimensional black
holes exhibit qualitatively new types of thermodynamic behaviour, discussed
here for ... | 1993-08-24 | 2010-04-06 | [
"gr-qc"
] | P.T. Landsberg and R.B. Mann |
gr-qc/9308025 | Quantum cosmology and the emergence of a classical world | This paper gives an elementary introduction to some of the conceptual
problems of quantum cosmology. Contents: 1. Why quantum cosmology? 2. Time in
quantum gravity 3.Decoherence and the recovery of the Schrodinger equation 4.
The direction of time | 1993-08-23 | 2009-09-25 | [
"gr-qc"
] | C. Kiefer |
gr-qc/9308024 | Quantum Gravity and Non-unitarity in Black Hole Evaporation | We discuss the relevance of quantum gravitational corrections to the
functional Schr\"odinger equation for the information loss paradox in black
hole evaporation. These corrections are found from the Wheeler-DeWitt equation
through a semiclassical expansion scheme. The dominant contribution in the
final evaporation sta... | 1993-08-23 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | Claus Kiefer, Rainer Mueller, and Tejinder P. Singh |
gr-qc/9308023 | Energy Radiation of Charged Particles in Conformally Flat Spacetimes | Original abstract: Consider the worldline of a charged particle in a static
spacetime. Contraction of the time-translation Killing field with the retarded
electromagnetic energy-momentum tensor gives a conserved electromagnetic energy
vector which can be used to define the radiated electromagnetic energy. This
note poi... | 1993-08-22 | 2008-02-03 | [
"gr-qc"
] | Stephen Parrott |
gr-qc/9308022 | Multiplicative Noise: Applications in Cosmology and Field Theory | Physical situations involving multiplicative noise arise generically in
cosmology and field theory. In this paper, the focus is first on exact
nonlinear Langevin equations, appropriate in a cosmologica setting, for a
system with one degree of freedom. The Langevin equations are derived using an
appropriate time-depende... | 1993-08-21 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Salman Habib |
gr-qc/9308020 | Quantum mechanical composition laws in reparameterization invariant
systems | This paper gives a brief description of the derivation of a composition law
for the propagator of a relativistic particle, in a sum over histories
quantization. The extension of this derivation to the problem of finding a
composition law for quantum cosmology is also discussed. (For the proceedings
of Journees Relativi... | 1993-08-20 | 2011-04-15 | [
"gr-qc",
"hep-th"
] | J.J.Halliwell and M.E.Ortiz |
gr-qc/9308021 | Integrals of Motion in the Two Killing Vector Reduction of General
Relativity | We apply the inverse scattering method to the midi-superspace models that are
characterized by a two-parameter Abelian group of motions with two spacelike
Killing vectors. We present a formulation that simplifies the construction of
the soliton solutions of Belinski\v i and Zakharov. Furthermore, it enables us
to obtai... | 1993-08-20 | 2010-11-01 | [
"gr-qc"
] | Nenad Manojlovi\'c and Bill Spence |
gr-qc/9308019 | Particle Creation in a universe filled by radiation and dust-like matter | In this article the particle creation process of scalar and spin 1/2
particles in a spatially open cosmological model associated with a universe
filled by radiation and dustlike matter. The Klein-Gordon and Dirac equations
are solved via separation of variables. After comparing the{\it \ in }and% {\it
\ out} vacua, we ... | 1993-08-19 | 2017-02-01 | [
"gr-qc"
] | Victor M. Villalba |
gr-qc/9308017 | On the mechanism of trapped surface formation | By a combination of analytical and numerical methods, the density profile of
a momentarily at rest spherical star is varied, and the corresponding response
in the area of the spherical shells is monitored. It is shown that the inner
apparent horizon (if it exists) must lie within or at most on the star's
surface, while... | 1993-08-19 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | David Valls-Gabaud and Thomas Zannias |
gr-qc/9308018 | Solution space of 2+1 gravity on ${\bf R} \times T^2$ in Witten's
connection formulation | We investigate the space ${\cal M}$ of classical solutions to Witten's
formulation of 2+1 gravity on the manifold ${\bf R} \times T^2$. ${\cal M}$ is
connected, unlike the spaces of classical solutions in the cases where $T^2$ is
replaced by a higher genus surface. Although ${\cal M}$ is neither Hausdorff
nor a manifol... | 1993-08-19 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | Jorma Louko and Donald M. Marolf |
gr-qc/9308016 | How to determine approximate Mixmaster parameters from numerical
evolution of Einstein's equations | To assess the validity of the Belinskii, Khalatnikov, and Lifshitz (BKL)
approximation to Mixmaster dynamics, it would be useful to evaluate the BKL
discrete parameters as a byproduct of the numerical solution of Einstein's
equations. An algorithm to do this and results for a typical trajectory are
presented. | 1993-08-17 | 2009-10-22 | [
"gr-qc"
] | Beverly K. Berger |
gr-qc/9308015 | The use of exp(iS[x]) in the sum over histories | The use of $\sum \exp(iS[x])$ as the generic form for a sum over histories in
configuration space is discussed critically and placed in its proper context.
The standard derivation of the sum over paths by discretizing the paths is
reviewed, and it is shown that the form $\sum \exp(iS[x])$ is justified only
for Schrodin... | 1993-08-17 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Arlen Anderson |
gr-qc/9308014 | No New Symmetries of the Vacuum Einstein Equations | In this note we examine some recently proposed solutions of the linearized
vacuum Einstein equations. We show that such solutions are {\it not} symmetries
of the Einstein equations, because of a crucial integrability condition. | 1993-08-16 | 2009-10-22 | [
"gr-qc"
] | Riccardo Capovilla |
gr-qc/9308013 | Did the Pseudo-Sphere Universe have a Beginning? | A calculation of the no-boundary wave-function of the universe is put forward
for a spacetime with negative curvature. A semi-classical Robertson-Walker
approximation is attempted and two solutions to the field equations, one
Lorentzian and the other a tunneling one are found. The regularity of those
solutions are anal... | 1993-08-12 | 2007-05-23 | [
"gr-qc"
] | G. Oliveira-Neto |
gr-qc/9308012 | Why is Spacetime Lorentzian? | We expand on the idea that spacetime signature should be treated as a
dynamical degree of freedom in quantum field theory. It has been argued that
the probability distribution for signature, induced by massless free fields, is
peaked at the Lorentzian value uniquely in D=4 dimensions. This argument is
reviewed, and cer... | 1993-08-12 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | A. Carlini and J. Greensite |
gr-qc/9308010 | Exact Superstring Motivated Cosmological Models | We present a number of new, exact scalar field cosmologies where the
potential consists of two or more exponential terms. Such potentials are
motivated by supergravity or superstring models formulated in higher
dimensional spacetimes that have been compactified to (3+1)-dimensions. We have
found solutions in both curve... | 1993-08-11 | 2010-04-06 | [
"gr-qc",
"astro-ph"
] | Richard Easther |
gr-qc/9308011 | Squeezed States and Uncertainty Relation at Finite Temperature | We use the quantum Brownian model to derive the uncertainty relation for a
quantum open system in an arbitrarily-squeezed initial state interacting with
an environment at finite temperature. We examine the relative importance of the
quantum and thermal fluctuations in the evolution of the system towards
equilibrium wit... | 1993-08-11 | 2019-06-05 | [
"gr-qc",
"hep-th"
] | B. L. Hu and Yuhong Zhang (Univ. of Maryland) |
gr-qc/9308009 | The Quantum Propagator for a Nonrelativistic Particle in the Vicinity of
a Time Machine | We study the propagator of a non-relativistic, non-interacting particle in
any non-relativistic ``time-machine'' spacetime of the type shown in Fig.~1: an
external, flat spacetime in which two spatial regions, $V_-$ at time $t_-$ and
$V_+$ at time $t_+$, are connected by two temporal wormholes, one leading from
the pas... | 1993-08-10 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-th"
] | Dalia S. Goldwirth, Malcolm J. Perry, Tsvi Piran and Kip S. Thorne |
gr-qc/9308008 | Properties of 3-manifolds for relativists | In canonical quantum gravity certain topological properties of 3-manifolds
are of interest. This article gives an account of those properties which have
so far received sufficient attention, especially those concerning the
diffeomorphism groups of 3-manifolds. We give a summary of these properties and
list some old and... | 1993-08-09 | 2015-06-25 | [
"gr-qc"
] | Domenico Giulini |
gr-qc/9308006 | Quantum Logic and the Histories Approach to Quantum Theory | An extended analysis is made of the Gell-Mann and Hartle axioms for a
generalised `histories' approach to quantum theory. Emphasis is placed on
finding equivalents of the lattice structure that is employed in standard
quantum logic. Particular attention is given to `quasi-temporal' theories in
which the notion of time-... | 1993-08-09 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | C.J.Isham (Imperial College) |
gr-qc/9308007 | Quantum Measurement, Gravitation, and Locality | This essay argues that when measurement processes involve energies of the
order of the Planck scale, the fundamental assumption of locality may no longer
be a good approximation. Idealized position measurements of two distinguishable
spin-$0$ particles are considered. The measurements alter the space-time metric
in a f... | 1993-08-09 | 2008-11-26 | [
"gr-qc",
"hep-th"
] | D. V. Ahluwalia |
gr-qc/9308005 | Aspects of the Decoherent Histories Approach to Quantum Mechanics | I give an informal overview of the decoherent histories approach to quantum
mechanics, due to Griffiths, to Omn\`es, and to Gell-Mann and Hartle is given.
Results on the connections between decoherence, records, correlation and
entropy are described. The emphasis of the presentation is on understanding the
broader mean... | 1993-08-06 | 2007-05-23 | [
"gr-qc"
] | J. J. Halliwell |
gr-qc/9308003 | Recollapse of the closed Tolman spacetimes | The closed-universe recollapse conjecture is studied for the spherically
symmetric spacetimes. It is proven that there exists an upper bound to the
lengths of timelike curves in any Tolman spacetime that possesses $S^3$ Cauchy
surfaces and whose energy density is positive. Furthermore, an explicit bound
is constructed ... | 1993-08-05 | 2009-10-22 | [
"gr-qc"
] | Gregory A. Burnett |
gr-qc/9308004 | The Stability of the Minisuperspace | The stability of the minisuperspace model of the early universe is studied by
solving the Wheeler-DeWitt equation numerically. We consider a system of
Einstein gravity with a scalar field. When we solve the Wheeler-DeWitt
equation, we pick up some inhomogeneous wave modes from the infinite number of
modes adequately: d... | 1993-08-05 | 2009-10-22 | [
"gr-qc"
] | Atushi Ishikawa and Toshiki Isse |
gr-qc/9308002 | The physical hamiltonian in nonperturbative quantum gravity | A quantum hamiltonian which evolves the gravitational field according to time
as measured by constant surfaces of a scalar field is defined through a
regularization procedure based on the loop representation, and is shown to be
finite and diffeomorphism invariant. The problem of constructing this
hamiltonian is reduced... | 1993-08-05 | 2011-09-30 | [
"gr-qc"
] | Carlo Rovelli and Lee Smolin |
gr-qc/9308001 | Bianchi Cosmologies: New Variables and a Hidden Supersymmetry | We find a supersymmetrization of the Bianchi IX cosmology in terms of
Ashtekar's new variables. This provides a framework for connecting the recent
results of Graham and those of Ryan and Moncrief for quantum states of this
model. These states are also related with the states obtained particularizing
supergravity for a... | 1993-08-04 | 2009-10-22 | [
"gr-qc"
] | Octavio Obregon, Jorge Pullin and Michael P. Ryan |
gr-qc/9307038 | Black Hole Entropy is Noether Charge | We consider a general, classical theory of gravity in $n$ dimensions, arising
from a diffeomorphism invariant Lagrangian. In any such theory, to each vector
field, $\xi^a$, on spacetime one can associate a local symmetry and, hence, a
Noether current $(n-1)$-form, ${\bf j}$, and (for solutions to the field
equations) a... | 1993-07-29 | 2008-11-26 | [
"gr-qc"
] | Robert M. Wald |
gr-qc/9307037 | Effective Potential of a Black Hole in Thermal Equilibrium with Quantum
Fields | Expectation values of one-loop renormalized thermal equilibrium stress-energy
tensors of free conformal scalars, spin-${1 \over 2}$ fermions and U(1) gauge
fields on a Schwarzschild black hole background are used as sources in the
semi-classical Einstein equation. The back-reaction and new equilibrium metric
are solved... | 1993-07-28 | 2012-08-27 | [
"gr-qc"
] | David Hochberg, Thomas W. Kephart and James W. York, Jr |
gr-qc/9307036 | Can the Gravitational Wave Background from Inflation be Detected
Locally? | The Cosmic Background Explorer (COBE) detection of microwave background
anisotropies may contain a component due to gravitational waves generated by
inflation. It is shown that the gravitational waves from inflation might be
seen using `beam-in-space' detectors, but not the Laser Interferometer Gravity
Wave Observatory... | 1993-07-26 | 2014-11-17 | [
"gr-qc",
"astro-ph"
] | Andrew R Liddle |
gr-qc/9307035 | Entropy Bounds and Black Hole Remnants | We rederive the universal bound on entropy with the help of black holes while
allowing for Unruh--Wald buoyancy. We consider a box full of entropy lowered
towards and then dropped into a Reissner--Nordstr\"om black hole in equilibrium
with thermal radiation. We avoid the approximation that the buoyant pressure
varies s... | 1993-07-25 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Jacob D. Bekenstein (University of California at Santa Barbara and
Hebrew University) |
gr-qc/9307033 | Dimensionally Continued Black Holes | Static, spherically symmetric solutions of the field equations for a
particular dimensional continuation of general relativity with negative
cosmological constant are studied. The action is, in odd dimensions, the
Chern-Simons form for the anti-de Sitter group and, in even dimensions, the
Euler density constructed with... | 1993-07-23 | 2009-10-22 | [
"gr-qc"
] | Maximo Banados, Claudio Teitelboim and Jorge Zanelli |
gr-qc/9307034 | Extended Gravity Theories and the Einstein-Hilbert Action | I discuss the relation between arbitrarily high-order theories of gravity and
scalar-tensor gravity at the level of the field equations and the action. I
show that $(2n+4)$-order gravity is dynamically equivalent to Brans-Dicke
gravity with an interaction potential for the Brans-Dicke field and $n$ further
scalar field... | 1993-07-23 | 2010-04-06 | [
"gr-qc"
] | David Wands |
gr-qc/9307032 | Numerical Investigation of Cosmological Singularities | Although cosmological solutions to Einstein's equations are known to be
generically singular, little is known about the nature of singularities in
typical spacetimes. It is shown here how the operator splitting used in a
particular symplectic numerical integration scheme fits naturally into the
Einstein equations for a... | 1993-07-22 | 2009-10-22 | [
"gr-qc"
] | B.K. Berger, V. Moncrief |
gr-qc/9307030 | A Noncommutative Extension of Gravity | The commutative algebra of functions on a manifold is extended to a
noncommutative algebra by considering its tensor product with the algebra of
nxn complex matrices. Noncommutative geometry is used to formulate an extension
of the Einstein-Hilbert action. The result is shown to be equivalent to the
usual Kaluza-Klein ... | 1993-07-22 | 2011-04-20 | [
"gr-qc"
] | J.Madore and J. Mourad |
gr-qc/9307031 | Loop Variables in Topological Gravity | We examine the relationship between covariant and canonical
(Ashtekar/Rovelli/Smolin) loop variables in the context of BF type topological
field theories in 2+1 and 3+1 dimensions, with respective gauge groups SO(2,1)
and SO(3,1). The latter model can be considered as the simplest topological
gravity theory in 3+1 dime... | 1993-07-22 | 2010-04-06 | [
"gr-qc"
] | Y. Bi and J. Gegenberg |
gr-qc/9307028 | Classical Models of Subatomic Particles | We look at the program of modelling a subatomic particle---one having mass,
charge, and angular momentum---as an interior solution joined to a classical
general-relativistic Kerr-Newman exterior spacetime. We find that the
assumption of stationarity upon which the validity of the Kerr-Newman exterior
solution depends i... | 1993-07-21 | 2009-10-22 | [
"gr-qc"
] | R.B. Mann and M.S. Morris |
gr-qc/9307029 | Solution to 2+1 Gravity in DreiBein formalism | The reduction of the dreibein formalism of 2+1 General Relativity to the
holonomies is explicitly performed. We also show explicitly how to relate these
holonomies to a geometry classically, and how to generate these holonomies from
any initial data for 2+1 gravity obeying the constraints. | 1993-07-21 | 2010-11-01 | [
"gr-qc"
] | W. G. Unruh and Peter Newbury |
gr-qc/9307027 | Semiclassical Equations for Weakly Inhomogeneous Cosmologies | The in-in effective action formalism is used to derive the semiclassical
correction to Einstein's equations due to a massless scalar quantum field
conformally coupled to small gravitational perturbations in spatially flat
cosmological models. The vacuum expectation value of the stress tensor of the
quantum field is dir... | 1993-07-21 | 2009-07-10 | [
"gr-qc"
] | Antonio Campos and Enric Verdaguer |
gr-qc/9307026 | Canonical variables and quasilocal energy in general relativity | Recently Brown and York have devised a new method for defining quasilocal
energy in general relativity. Their method yields expressions for the
quasilocal energy and momentum surface densities associated with the
two-boundary of a spacelike slice of a spatially bounded spacetime. These
expressions are essentially Arnow... | 1993-07-21 | 2010-04-06 | [
"gr-qc"
] | Stephen Lau |
gr-qc/9307024 | Quantum Squeezing and Cosmological Entropy Production | The entropy growth in a cosmological process of pair production is completely
determined by the associated squeezing parameter, and is insensitive to the
number of particles in the initial state. The total produced entropy may
represent a significant fraction of the entropy stored today in the cosmic
black-body radiati... | 1993-07-20 | 2010-04-06 | [
"gr-qc",
"astro-ph",
"hep-th"
] | M.Gasperini and M.Giovannini |
gr-qc/9307025 | The Geometry and Topology of 3-Manifolds and Gravity | It is well known that one can parameterize 2-D Riemannian structures by
conformal transformations and diffeomorphisms of fiducial constant curvature
geometries; and that this construction has a natural setting in general
relativity theory in 2-D. I will show that a similar parameterization exists
for 3-D Riemannian str... | 1993-07-20 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | J. Gegenberg and G. Kunstatter |
gr-qc/9307023 | How to Estimate Energy Lost to Gravitational Waves (revised) | The energy--momentum radiated in gravitational waves by an isolated source is
given by a formula of Bondi. This formula is highly non--local: the
energy--momentum is not given as the integral of a well--defined local density.
It has therefore been unclear whether the Bondi formula can be used to get
information from gr... | 1993-07-19 | 2009-10-22 | [
"gr-qc"
] | Adam D. Helfer |
gr-qc/9307022 | Energy, Temperature, and Entropy of Black Holes Dressed with Quantum
Fields | A deeper understanding of the thermal properties of black holes than we
presently have depends to a large degree on obtaining a firmer grasp of the
properties of the entropy. For such an understanding we must at least know the
basic relations among entropy, energy, and temperature of a black hole in
thermal equilibrium... | 1993-07-19 | 2012-08-27 | [
"gr-qc"
] | James. W. York, Jr |
gr-qc/9307021 | On Singularity Free Cosmological Models | In 1990 Senovilla$^1$ obtained an interestisng cosmological solution of
Einstein's equations that was free of the big-bang singularity. It represented
an inhomogeneous and anisotropic cylindrical model filled with disordered
radiation, ${\bf \rho = 3p}$. The model was valid for ${\bf t \rightarrow -
\infty }$ to ${\bf ... | 1993-07-15 | 2007-05-23 | [
"gr-qc"
] | N. Dadhich, R. Tikekar and L.K. Patel |
gr-qc/9307016 | The origin of spacetime topology and generalizations of quantum field
theory | The research effort reported in this paper is directed, in a broad sense,
towards understanding the small-scale structure of spacetime. The fundamental
question that guides our discussion is ``what is the physical content of
spacetime topology?" In classical physics, if spacetime, $(X, \tau )$, has
sufficiently regular... | 1993-07-14 | 2010-04-06 | [
"gr-qc"
] | Ulvi Yurtsever |
gr-qc/9307020 | Collapse of a Circular Loop of Cosmic String | We study the collapse of a circular loop of cosmic string. The gravitational
field of the string is treated using the weak field approximation. The
gravitational radiation from the loop is evaluated numerically. The memtric of
the loop near the point of collapse is found analytically. | 1993-07-14 | 2009-10-22 | [
"gr-qc"
] | David Garfinkle and G. Comer Duncan |
gr-qc/9307018 | Superspace Dynamics and Perturbations Around "Emptiness" | Superspace parametrized by gauge potentials instead of metric
three-geometries is discussed in the context of the Ashtekar variables. Among
other things, an "internal clock" for the full theory can be identified.
Gauge-fixing conditions which lead to the natural geometrical separation of
physical from gauge modes are d... | 1993-07-14 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | Chopin Soo and Lay Nam Chang |
gr-qc/9307017 | Algebraic approach to quantum field theory on non-globally-hyperbolic
spacetimes | The mathematical formalism for linear quantum field theory on curved
spacetime depends in an essential way on the assumption of global
hyperbolicity. Physically, what lie at the foundation of any formalism for
quantization in curved spacetime are the canonical commutation relations,
imposed on the field operators evalu... | 1993-07-14 | 2010-04-06 | [
"gr-qc"
] | Ulvi Yurtsever |
gr-qc/9307019 | Generalized Sums over Histories for Quantum Gravity II. Simplicial
Conifolds | This paper examines the issues involved with concretely implementing a sum
over conifolds in the formulation of Euclidean sums over histories for gravity.
The first step in precisely formulating any sum over topological spaces is that
one must have an algorithmically implementable method of generating a list of
all spa... | 1993-07-14 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Kristin Schleich and Donald M. Witt |
gr-qc/9307015 | Generalized Sums over Histories for Quantum Gravity I. Smooth Conifolds | This paper proposes to generalize the histories included in Euclidean
functional integrals from manifolds to a more general set of compact
topological spaces. This new set of spaces, called conifolds, includes
nonmanifold stationary points that arise naturally in a semiclasssical
evaluation of such integrals; additiona... | 1993-07-13 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | Kristin Schleich and Donald M. Witt |
gr-qc/9307013 | Quantum-Mechanical Histories and the Uncertainty Principle. II.
Fluctuations About Classical Predictability | This paper is concerned with two questions in the decoherent histories
approach to quantum mechanics: the emergence of approximate classical
predictability, and the fluctuations about it necessitated by the uncertainty
principle. We consider histories characterized by position samplings at $n$
moments of time. We use t... | 1993-07-12 | 2009-10-22 | [
"gr-qc",
"cond-mat",
"hep-th"
] | J.J.Halliwell |
gr-qc/9307014 | Testing Cosmic Censorship with Black Hole Collisions | There exists an upper limit on the mass of black holes when the cosmological
constant $\Lambda$ is positive. We study the collision of two black holes whose
total mass exceeds this limit. Our investigation is based on a recently
discovered exact solution describing the collision of $Q=M$ black holes with
$\Lambda > 0$.... | 1993-07-12 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Dieter Brill, Gary Horowitz, David Kastor, and Jennie Traschen |
gr-qc/9307012 | Singularity Free Spacetimes -- I :Metric and Fluid Models | We show that the metric for the singularity free family of fluid models [3]
can be obtained by a simple and natural inhomogenisation and anisotropisation
procedure from Friedman--Robertson--Walker metric with negative curvature. The
metric is unique for cylindrically symmetric spacetime with metric potentials
being sep... | 1993-07-12 | 2007-05-23 | [
"gr-qc"
] | Naresh Dadhich, L. K. Patel and R. Tikekar |
gr-qc/9307011 | On Singularity Free Spacetimes--II : mid Geodesic Completeness | We study the geodesics of the singularity free metric considered in the
preceding Paper I and show that they are complete. This once again demonstrates
the absence of singularity. The geodesic completeness is established in general
without reference to any particular matter distribution. The metric is globally
hyperbol... | 1993-07-12 | 2007-05-23 | [
"gr-qc"
] | Naresh Dadhich and L. K. Patel |
gr-qc/9307009 | Late-Time Behavior of Stellar Collapse and Explosions: I. Linearized
Perturbations | Problem with the figures should be corrected. Apparently a broken uuencoder
was the cause. | 1993-07-10 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Carsten Gundlach, Richard Price and Jorge Pullin |
gr-qc/9307010 | Late-Time Behavior of Stellar Collapse and Explosions: II. Nonlinear
Evolution | Problem with the figures should be corrected. Apparently a broken uuencoder
was the cause. | 1993-07-10 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Carsten Gundlach, Richard Price adn Jorge Pullin |
gr-qc/9307007 | 2D dilaton-gravity from 5D Einstein equations | A semiclassical two-dimensional dilaton-gravity model is obtained by
dimensional reduction of the spherically symmetric five-dimensional Einstein
equations and used to investigate black hole evaporation. It is shown that this
model prevents the formation of naked singularity and allows spacetime
wormholes to contribute... | 1993-07-09 | 2016-08-14 | [
"gr-qc"
] | P.F. Gonz\'alez-D\'iaz |
gr-qc/9307008 | Gravitational Effects on Domain Walls with Curvature Correction | We derive the effective action for a domain wall with small thickness in
curved spacetime and show that, apart from the Nambu term, it includes a
contribution proportional to the induced curvature. We then use this action to
study the dynamics of a spherical thick bubble of false vacuum (de Sitter)
surrounded by an inf... | 1993-07-09 | 2009-10-22 | [
"gr-qc"
] | C.Barrabes, B.Boisseau and M.Sakellariadou |
gr-qc/9307006 | The Phase Space of 2+1 Dimensional Gravity in the Ashtekar Formulation | The Ashtekar formulation of 2+1 gravity differs from the geometrodynamical
and Witten descriptions when the 2-metric is degenerate. We study the phase
space of 2+1 gravity in the Ashtekar formulation to understand these degenerate
solutions to the field equations. In the process we find two new systems of
first class c... | 1993-07-08 | 2017-03-24 | [
"gr-qc"
] | J. Fernando Barbero and Madhavan Varadarajan |
gr-qc/9307004 | A Phase Space for Gravitational Radiation | We give a new definition, based on considerations of well-posedness for a
certain asymptotic initial value problem, of the phase space for the radiative
degrees of freedom of the gravitational field in exact General Relativity. This
space fibres over the space of final states, with the fibres being the purely
radiative... | 1993-07-07 | 2010-11-01 | [
"gr-qc"
] | Adam D. Helfer |
gr-qc/9307005 | Twistors and the BMS Group | We compute the motions of null infinity to which the components of the
angular momentum of the gravitational field, as defined by Penrose, are
conjugate. We find that the boosts are supplemented by anomalous translations.
If $c_{ab}$ is the skew bivector determining the component of the angular
momentum in question, th... | 1993-07-07 | 2010-04-06 | [
"gr-qc"
] | Adam D. Helfer |
gr-qc/9307003 | Models of Particle Detection in Regions of Spacetime | We investigate two models of measuring devices designed to detect a
non-relativistic free particle in a given region of spacetime. These models
predict different probabilities for a free quantum particle to enter a
spacetime region $R$ so that this notion is device dependent. The first model
is of a von Neumann couplin... | 1993-07-06 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Donald Marolf |
gr-qc/9307002 | Conformal Invariance of Black Hole Temperature | It is shown that the surface gravity and temperature of a stationary black
hole are invariant under conformal transformations of the metric that are the
identity at infinity. More precisely, we find a conformal invariant definition
of the surface gravity of a conformal Killing horizon that agrees with the
usual definit... | 1993-07-06 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | Ted Jacobson and Gungwon Kang |
gr-qc/9307001 | Recovery of information from black hole radiation by considering
stimulated emission | We deal with the black hole information loss paradox by showing that the
stimulated emission component of the black hole radiation contains information
about the initial state of the system. The nonlocal behaviour that allows the
recovery of information about the matter that falls behind the horizon appears
in a natura... | 1993-07-01 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | R. Mueller and Carlos O. Lousto |
gr-qc/9306035 | From the Big Bang Theory to the Theory of a Stationary Universe | We consider chaotic inflation in the theories with the effective potentials
phi^n and e^{\alpha\phi}. In such theories inflationary domains containing
sufficiently large and homogeneous scalar field \phi permanently produce new
inflationary domains of a similar type. We show that under certain conditions
this process o... | 1993-06-29 | 2009-09-29 | [
"gr-qc",
"astro-ph",
"hep-lat"
] | Andrei Linde, Dmitri Linde and Arthur Mezhlumian |
gr-qc/9306034 | On the Constraint Algebra of Degenerate Relativity | As shown by Ashtekar in the mid 80's, general relativity can be extended to
incorporate degenerate metrics. This extension is not unique, however, as one
can change the form of the hamiltonian constraints and obtain an {\it
alternative} degenerate extension of general relativity that disagrees with
Ashtekar's original ... | 1993-06-28 | 2009-10-22 | [
"gr-qc"
] | Joseph D. Romano |
gr-qc/9306033 | Gravitational Waves from an Axi-symmetric Source in the Nonsymmetric
Gravitational Theory | We examine gravitational waves in an isolated axi--symmetric reflexion
symmetric NGT system. The structure of the vacuum field equations is analyzed
and the exact solutions for the field variables in the metric tensor are found
in the form of expansions in powers of a radial coordinate. We find that in the
NGT axially ... | 1993-06-25 | 2015-06-25 | [
"gr-qc"
] | N. J. Cornish, J. W. Moffat and D. C. Tatarski |
gr-qc/9306032 | Black Hole with Non-Commutative Hair | The specific nonlinear vector $\sigma$-model coupled to Einstein gravity is
investigated. The model arises in the studies of the gravitating matter in
non-commutative geometry. The static spherically symmetric spacetimes are
identified by direct solving of the field equations. The asymptotically flat
black hole with th... | 1993-06-25 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | C. Klimcik, P. Kolnik, and A. Pompos |
gr-qc/9306031 | Elliptic and circular wormholes | Two new exact analytical solutions of the euclidean Einstein equations for a
minimal massless scalar field and negative cosmological constant have been
obtained. These solutions are given in terms of Jacobian elliptic or circular
functions, rather than hyperbolic functions, connect large asymptotic regions
of maximally... | 1993-06-25 | 2016-08-14 | [
"gr-qc"
] | P.F. Gonz\'alez-D\'iaz |
gr-qc/9306029 | On time and the quantum-to-classical transition in Jordan-Brans-Dicke
quantum gravity | Any quantum theory of gravity which treats the gravitational constant as a
dynamical variable has to address the issue of superpositions of states
corresponding to different eigenvalues. We show how the unobservability of such
superpositions can be explained through the interaction with other
gravitational degrees of f... | 1993-06-24 | 2010-04-06 | [
"gr-qc",
"astro-ph",
"hep-th"
] | Claus Kiefer and Erik A. Martinez |
gr-qc/9306030 | Gravitational Observables and Local Symmetries | Using a recent classification of local symmetries of the vacuum Einstein
equations, it is shown that there can be no observables for the vacuum
gravitational field (in a closed universe) built as spatial integrals of local
functions of Cauchy data and their derivatives. | 1993-06-24 | 2010-01-06 | [
"gr-qc",
"hep-th"
] | C. G. Torre |
gr-qc/9306028 | Geometric Phase in Vacuum Instability:APPLICATIONS in Quantum Cosmology | Three different methods viz. i) a perturbative analysis of the Schr\"odinger
equation ii) abstract differential geometric method and iii) a semiclassical
reduction of the Wheeler-Dewitt equation, relating Pancharatnam phase to vacuum
instability are discussed. An improved semiclassical reduction is also shown to
yield ... | 1993-06-24 | 2010-11-01 | [
"gr-qc"
] | D.P. Datta |
gr-qc/9306027 | Blow-Up of Test Fields Near Cauchy Horizons | The behaviour of test fields near a compact Cauchy horizon is investigated.
It is shown that solutions of nonlinear wave equations on Taub spacetime with
generic initial data cannot be continued smoothly to both extensions of the
spacetime through the Cauchy horizon. This is proved using an energy method.
Similar resul... | 1993-06-23 | 2009-10-22 | [
"gr-qc"
] | J. Rauch and A. D. Rendall |
gr-qc/9306026 | Gauge fields on Riemann-Cartan space-times | Gauge fields are described on an Riemann-Cartan space-time by means of
tensor-valued differential forms and exterior calculus. It is shown that
minimal coupling procedure leads to a gauge invariant theory where gauge fields
interact with torsion, and that consistency conditions for the gauge fields
impose restrictions ... | 1993-06-22 | 2009-10-22 | [
"gr-qc"
] | Alberto Saa |
gr-qc/9306025 | Open Questions in Classical Gravity | We discuss some outstanding open questions regarding the validity and
uniqueness of the standard second order Newton-Einstein classical gravitational
theory. On the observational side we discuss the degree to which the realm of
validity of Newton's Law of Gravity can actually be extended to distances much
larger than t... | 1993-06-21 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Philip D. Mannheim (University of Connecticut) |
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