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/9411061 | Large Deformations of Relativistic Membranes: A Generalization of the
Raychaudhuri Equations | A coupled system of non-linear partial differential equations is presented
which describes non-perturbatively the evolution of deformations of a
relativistic membrane of arbitrary dimension, $D$, in an arbitrary background
spacetime. These equations can be considered from a formal point of view as
higher dimensional an... | 1994-11-23 | 2009-10-22 | [
"gr-qc"
] | Riccardo Capovilla and Jemal Guven |
gr-qc/9411060 | Geometry of Deformations of Relativistic Membranes | A kinematical description of infinitesimal deformations of the worldsheet
spanned in spacetime by a relativistic membrane is presented. This provides a
framework for obtaining both the classical equations of motion and the
equations describing infinitesimal deformations about solutions of these
equations when the actio... | 1994-11-23 | 2009-10-22 | [
"gr-qc"
] | Riccardo Capovilla and Jemal Guven |
gr-qc/9411058 | Instability Proof for Einstein-Yang-Mills Solitons and Black Holes with
Arbitrary Gauge Groups | We prove that static, spherically symmetric, asymptotically flat soliton and
black hole solutions of the Einstein-Yang-Mills equations are unstable for
arbitrary gauge groups, at least for the ``generic" case. This conclusion is
derived without explicit knowledge of the possible equilibrium solutions. | 1994-11-22 | 2010-11-01 | [
"gr-qc"
] | Othmar Brodbeck and Norbert Straumann |
gr-qc/9411057 | Note on Massive Spin 2 in Curved Space | We give a Hamiltonian formulation of massive spin 2 theory in arbitrary
Einstein space-times. We pay particular attention to Higuchi's forbidden mass
range in deSitter space. | 1994-11-22 | 2010-11-01 | [
"gr-qc"
] | Ingemar Bengtsson (Univ. of Stockholm) |
gr-qc/9411059 | Lsdiff M and the Einstein Equations | We give a formulation of the vacuum Einstein equations in terms of a set of
volume-preserving vector fields on a four-manifold ${\cal M}$. These vectors
satisfy a set of equations which are a generalisation of the Yang-Mills
equations for a constant connection on flat spacetime. | 1994-11-22 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | James D.E. Grant |
gr-qc/9411053 | Remarks on the frequency spectra of some fundamental quantum effects | Short remarks on the problem of assigning frequency spectra to Casimir,
sonoluminescence, Hawking, Unruh, and quantum optical squeezing effects are
presented | 1994-11-21 | 2008-02-03 | [
"gr-qc",
"quant-ph"
] | H.C. Rosu |
gr-qc/9411055 | Recent Mathematical Developments in Quantum General Relativity | After a brief chronological sketch of developments in non-perturbative
canonical quantum gravity, some of the recent mathematical results are
reviewed. These include: i) an explicit construction of the quantum counterpart
of Wheeler's superspace; ii) a rigorous procedure leading to the general
solution of the diffeomor... | 1994-11-21 | 2008-02-03 | [
"gr-qc",
"hep-th"
] | Abhay Ashtekar |
gr-qc/9411056 | The averaged null energy condition and difference inequalities in
quantum field theory | Recently, Larry Ford and Tom Roman have discovered that in a flat cylindrical
space, although the stress-energy tensor itself fails to satisfy the averaged
null energy condition (ANEC) along the (non-achronal) null geodesics, when the
``Casimir-vacuum" contribution is subtracted from the stress-energy the
resulting ten... | 1994-11-21 | 2009-10-22 | [
"gr-qc"
] | Ulvi Yurtsever |
gr-qc/9411054 | A Mass Bound for Spherically Symmetric Black Hole Spacetimes | Requiring that the matter fields are subject to the dominant energy
condition, we establish the lower bound $(4\pi)^{-1} \kappa {\cal A}$ for the
total mass $M$ of a static, spherically symmetric black hole spacetime. (${\cal
A}$ and $\kappa$ denote the area and the surface gravity of the horizon,
respectively.) Togeth... | 1994-11-21 | 2010-04-06 | [
"gr-qc"
] | M. Heusler |
gr-qc/9411052 | Superluminal Velocity of Photons in a Gravitational Background | The influence of radiative corrections on the photon propagation in a
gravitational background is investigated without the low-frequency
approximation $\omega \ll m$. The conclusion is made in this way that the
velocity of light can exceed unity. | 1994-11-20 | 2009-10-22 | [
"gr-qc"
] | I.B. Khriplovich |
gr-qc/9411051 | Hybridizing the skyrmion with an anti-de-Sitter bag | I discuss a phenomenological model of the nucleon in which a small anti-de
Sitter bag is placed into the Skyrmion configuration. Such a bag has a timelike
boundary and allows naturally the Cheshire Cat Principle. Very important in
this model is the membrane of the bag, the 3-dimensional time-space manifold
S^{1}\times ... | 1994-11-20 | 2009-10-22 | [
"gr-qc",
"hep-ph"
] | H.C. Rosu |
gr-qc/9411050 | Structure of the Spherical Black Hole Interior | The internal structure of a charged spherical black hole is still a topic of
debate. In a nonrotating but aspherical gravitational collapse to form a
spherical charged black hole, the backscattered gravitational wave tails enter
the black hole and are blueshifted at the Cauchy horizon. This has a
catastrophic effect if... | 1994-11-18 | 2019-08-15 | [
"gr-qc"
] | A. Bonanno, S. Droz, W.Israel and S.M. Morsink |
gr-qc/9411049 | Gravitational field of an infinitely long supermassive cosmic string | We obtain an exact solution of the coupled Einstein-scalar-gauge field
equations for a local infinitely long supermassive cosmic string. The solution
correponds to that of Hiscock-Gott . The string appears to be due to the
freezing of the scalar field at the null value giving rise to a constant linear
energy density. | 1994-11-18 | 2007-05-23 | [
"gr-qc"
] | M.M. Som (UFRJ - Brasil) and Marcelo de Oliveira Souza (UFRJ and UENF
- Brasil) |
gr-qc/9411048 | Quasilocal Energy-Momentum for Geometric Gravity Theories | From a covariant Hamiltonian formulation, using symplectic ideas, we obtain
covariant quasilocal energy-momentum boundary expressions for general gravity
theories. The expressions depend upon which variables are fixed on the
boundary, a reference configuration and a displacement vector field. We
consider applications t... | 1994-11-18 | 2009-10-22 | [
"gr-qc"
] | Chiang-Mei Chen, James M. Nester and Roh Suan Tung |
gr-qc/9411047 | Hamiltonian approach to relativistic star models | An ADM-like Hamiltonian approach is proposed for static spherically symmetric
relativistic star configurations. For a given equation of state the entire
information about the model can be encoded in a certain 2-dimensional
minisuperspace geometry. We derive exact solutions which arise from symmetries
corresponding to l... | 1994-11-18 | 2010-04-06 | [
"gr-qc"
] | Kjell Rosquist |
gr-qc/9411046 | Projective Techniques and Functional Integration | A general framework for integration over certain infinite dimensional spaces
is first developed using projective limits of a projective family of compact
Hausdorff spaces. The procedure is then applied to gauge theories to carry out
integration over the non-linear, infinite dimensional spaces of connections
modulo gaug... | 1994-11-17 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | Abhay Ashtekar and Jerzy Lewandowski |
gr-qc/9411042 | The Interstellar Medium as a Gravity Wave Detector | An observer, situated several thousand light-years away from a radio pulsar,
finds himself embedded in the diffraction pattern resulting from the
propagation of the radio waves through the irregular interstellar medium. The
observer's movement relative to the pattern causes an apparent scintillation of
the pulsar. A bi... | 1994-11-16 | 2010-11-01 | [
"gr-qc",
"astro-ph"
] | Redouane Fakir |
gr-qc/9411044 | How and why the wave function collapses after a measurement | We explain the collapse of the wavefunction with the notion that, in a
measurement, the system observed nucleates a first order phase transition in
the measuring device. The possible final states differ by the values of
macroscopic observables, and their relative phase is therefore unobservable.
The process is irrevers... | 1994-11-16 | 2007-05-23 | [
"gr-qc",
"quant-ph"
] | Massimo Fioroni and Giorgio Immirzi |
gr-qc/9411045 | Chaos and Semiclassical Limit in Quantum Cosmology | In this paper we present a Friedmann-Robertson-Walker cosmological model
conformally coupled to a massive scalar field where the WKB approximation fails
to reproduce the exact solution to the Wheeler-DeWitt equation for large
Universes. The breakdown of the WKB approximation follows the same pattern than
in semiclassic... | 1994-11-16 | 2009-10-22 | [
"gr-qc"
] | Esteban Calzetta and Juan Jose Gonzalez |
gr-qc/9411038 | Regularization of the Hamiltonian constraint and the closure of the
constraint algebra | In the paper we discuss the process of regularization of the Hamiltonian
constraint in the Ashtekar approach to quantizing gravity. We show in detail
the calculation of the action of the regulated Hamiltonian constraint on Wilson
loops. An important issue considered in the paper is the closure of the
constraint algebra... | 1994-11-15 | 2009-10-22 | [
"gr-qc"
] | Roumen Borissov |
gr-qc/9411039 | The Semi-Classical Back Reaction to Black Hole Evaporation | The semi-classical back reaction to black hole evaporation (wherein the
renormalized energy momentum tensor is taken as source of Einstein's equations)
is analyzed in detail. It is proven that the mass of a Schwarzshild black hole
decreases according to Hawking's law $dM/dt = - C/ M^2$ where $C$ is a constant
of order ... | 1994-11-15 | 2010-11-01 | [
"gr-qc"
] | S. Massar |
gr-qc/9411041 | Inflation from Extra Dimensions | A gravity-driven inflation is shown to arise from a simple higher dimensional
universe. In vacuum, the shear of $n>1$ contracting dimensions is able to
inflate the remaining three spatial dimensions. Said another way, the expansion
of the 3-volume is accelerated by the contraction of the $n$-volume. Upon
dimensional re... | 1994-11-15 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Janna Levin |
gr-qc/9411043 | Filtering post-Newtonian gravitational waves from coalescing binaries | Gravitational waves from inspiralling binaries are expected to be detected
using a data analysis technique known as {\it matched filtering.} This
technique is applicable whenever the form of the signal is known accurately.
Though we know the form of the signal precisely, we will not know {\it a
priori} its parameters. ... | 1994-11-15 | 2010-01-06 | [
"gr-qc"
] | B. S. Sathyaprakash |
gr-qc/9411040 | Long wavelength iteration of Einstein's equations near a spacetime
singularity | We clarify the links between a recently developped long wavelength iteration
scheme of Einstein's equations, the Belinski Khalatnikov Lifchitz (BKL) general
solution near a singularity and the antinewtonian scheme of Tomita's. We
determine the regimes when the long wavelength or antinewtonian scheme is
directly applica... | 1994-11-15 | 2009-10-22 | [
"gr-qc"
] | N. Deruelle and D. Langlois |
gr-qc/9411035 | Pedestrian notes on quantum mechanics | I present an elementary essay on some issues related to nonrelativistic
quantum mechanics, which is written in the spirit of extreme simplicity, making
it an easy-to-read paper. Moreover, one can find a useful collection of ideas
and opinions expressed by many well-known authors in this vast research field | 1994-11-14 | 2008-02-03 | [
"gr-qc",
"quant-ph"
] | H.C. Rosu |
gr-qc/9411036 | QED on Curved Background and on Manifolds with Boundaries: Unitarity
versus Covariance | Some recent results show that the covariant path integral and the integral
over physical degrees of freedom give contradicting results on curved
background and on manifolds with boundaries. This looks like a conflict between
unitarity and covariance. We argue that this effect is due to the use of
non-covariant measure ... | 1994-11-14 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Dmitri V. Vassilevich |
gr-qc/9411037 | The Energy Spectrum of the Membrane effective Model for Quantum Black
Holes | We study first order fluctuations of a relativistic membrane in the curved
background of a black hole. The zeroth-order solution corresponds to a
spherical membrane tightly covering the event horizon. We obtain a massive
Klein-Gordon equation for the fluctuations of the membrane's radial coordinate
on the 2+1 dimension... | 1994-11-14 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-th"
] | Carlos O. Lousto |
gr-qc/9411034 | Remarks about Static Back-Reaction on Black Hole Spacetimes | Recently, it has been claimed that the back reaction of vacuum polarization
on a black hole spacetime naturally regularizes infinities in the black hole
entropy. We examine the back reaction calculation and find no such
short-distance cut-off,in contradiction with these recent claims. Moreover, the
intuitive expectatio... | 1994-11-13 | 2007-05-23 | [
"gr-qc"
] | Neil J. Cornish and Janna J. Levin |
gr-qc/9411032 | Stellar Equilibrium in 2+1 Dimensions | The hydrostatic equilibrium of a $2+1$ dimensional perfect fluid star in
asymptotically anti-de Sitter space is discussed. The interior geometry matches
the exterior $2+1$ black-hole solution. An upper mass limit is found, analogous
to Buchdahl's theorem in 3+1, and the possibility of collapse is discussed. The
case of... | 1994-11-12 | 2010-04-06 | [
"gr-qc"
] | Norman Cruz and Jorge Zanelli |
gr-qc/9411031 | Comparative Quantizations of (2+1)-Dimensional Gravity | We compare three approaches to the quantization of (2+1)-dimensional gravity
with a negative cosmological constant: reduced phase space quantization with
the York time slicing, quantization of the algebra of holonomies, and
quantization of the space of classical solutions. The relationships among these
quantum theories... | 1994-11-12 | 2010-04-28 | [
"gr-qc",
"hep-th"
] | S. Carlip and J.E. Nelson |
gr-qc/9411033 | Existence and uniqueness theorems for massless fields on a class of
spacetimes with closed timelike curves | We study the massless scalar field on asymptotically flat spacetimes with
closed timelike curves (CTC's), in which all future-directed CTC's traverse one
end of a handle (wormhole) and emerge from the other end at an earlier time.
For a class of static geometries of this type, and for smooth initial data with
all deriv... | 1994-11-12 | 2009-10-22 | [
"gr-qc"
] | John L. Friedman and Michael S. Morris |
gr-qc/9411029 | Gravitational Radiation from Coalescing Binary Neutron Stars | We calculate the gravitational radiation produced by the merger and
coalescence of inspiraling binary neutron stars using 3-dimensional numerical
simulations. The stars are modeled as polytropes and start out in the
point-mass limit at wide separation. The hydrodynamic integration is performed
using smooth particle hyd... | 1994-11-11 | 2011-09-09 | [
"gr-qc",
"astro-ph"
] | Xing Zhuge, Joan M. Centrella, and Stephen L. W. McMillan (Drexel
University) |
gr-qc/9411028 | The trace left by signature-change-induced compactification | Recently, it has been shown that an infinite succession of classical
signature changes (''signature oscillations'') can compactify and stabilize
internal dimensions, and simultaneously leads, after a coarse graining type of
average procedure, to an effective (''physical'') space-time geometry
displaying the usual Loren... | 1994-11-11 | 2010-04-06 | [
"gr-qc"
] | Franz Embacher |
gr-qc/9411030 | Scale-invariant phase space and the conformal group | The gauge bundle of the 4-dim conformal group over an 8-dim base space,
called biconformal space, is shown have a consistent interpretation as a
scale-invariant phase space. Specifically, we show that a classical Hamiltonian
system generates a differential geometry which is necessarily biconformal, and
that the classic... | 1994-11-11 | 2007-05-23 | [
"gr-qc"
] | James T. Wheeler |
gr-qc/9411027 | Consistency of the Nonsymmetric Gravitational Theory | A nonsymmetric gravitational theory (NGT) is presented which is free of ghost
poles, tachyons and higher-order poles and there are no problems with
asymptotic boundary conditions. An extended Birkhoff theorem is shown to hold
for the spherically symmetric solution of the field equations. A static
spherically symmetric ... | 1994-11-10 | 2008-02-03 | [
"gr-qc"
] | J. W. Moffat |
gr-qc/9411026 | Collapse to Black Holes in Brans-Dicke Theory: II. Comparison with
General Relativity | We discuss a number of long-standing theoretical questions about collapse to
black holes in the Brans-Dicke theory of gravitation. Using a new numerical
code, we show that Oppenheimer-Snyder collapse in this theory produces black
holes that are identical to those of general relativity in final equilibrium,
but are quit... | 1994-11-10 | 2010-11-01 | [
"gr-qc"
] | Mark A. Scheel, Stuart L. Shapiro, and Saul A. Teukolsky |
gr-qc/9411025 | Collapse to Black Holes in Brans-Dicke Theory: I. Horizon Boundary
Conditions for Dynamical Spacetimes | We present a new numerical code that evolves a spherically symmetric
configuration of collisionless matter in the Brans-Dicke theory of gravitation.
In this theory the spacetime is dynamical even in spherical symmetry, where it
can contain gravitational radiation. Our code is capable of accurately tracking
collapse to ... | 1994-11-10 | 2009-10-22 | [
"gr-qc"
] | Mark A. Scheel, Stuart L. Shapiro, and Saul A. Teukolsky |
gr-qc/9411021 | Thermodynamics of the Stephani Universes | We examine the consistency of the thermodynamics of the most general class of
conformally flat solution with an irrotational perfect fluid source (the
Stephani Universes). For the case when the isometry group has dimension
$r\ge2$, the Gibbs-Duhem relation is always integrable, but if $r<2$ it is only
integrable for th... | 1994-11-08 | 2015-06-25 | [
"gr-qc"
] | Hernando Quevedo and Roberto Sussman |
gr-qc/9411017 | Hamiltonian thermodynamics of the Schwarzschild black hole | Kucha\v{r} has recently given a detailed analysis of the classical and
quantum geometrodynamics of the Kruskal extension of the Schwarzschild black
hole. In this paper we adapt Kucha\v{r}'s analysis to the exterior region of a
Schwarzschild black hole with a timelike boundary. The reduced Lorentzian
Hamiltonian is show... | 1994-11-08 | 2010-11-19 | [
"gr-qc",
"hep-th"
] | Jorma Louko and Bernard F. Whiting |
gr-qc/9411020 | Local and global structure of a thick domain wall space-time | The local and global properties of the Goetz thick plane domain wall
space-time are studied. It is found that when the surface energy of the wall is
greater than a critical value $\sigma_{c}$, the space-time will be closed by
intermediate singularities at a finite proper distance. A model is presented in
which these si... | 1994-11-08 | 2009-09-25 | [
"gr-qc"
] | Anzhong Wang and Patricio S. Letelier |
gr-qc/9411023 | Maximally Symmetric Spin-Two Bitensors on $S^3$ and $H^3$ | The transverse traceless spin-two tensor harmonics on $S^3$ and $H^3$ may be
denoted by $T^{(kl)}{}_{ab}$. The index $k$ labels the (degenerate) eigenvalues
of the Laplacian $\square$ and $l$ the other indices. We compute the bitensor
$\sum_l T^{(kl)}{}_{ab}(x) T^{(kl)}{}_{a'b'}(x')^*$ where $x,x'$ are distinct
points ... | 1994-11-08 | 2009-10-22 | [
"gr-qc"
] | Bruce Allen |
gr-qc/9411019 | Gravitational and Particle Radiation from Cosmic Strings | Gravitational and massless particle radiation of straight cosmic strings with
finite thickness is studied analytically. It is found that the non-linear
interaction of the radiation fields emitted by a cosmic string with the ones of
the string always makes the spacetime singular at the symmetry axis. The
singularity is ... | 1994-11-08 | 2009-07-07 | [
"gr-qc"
] | Anzhong Wang and Nilton O. Santos |
gr-qc/9411022 | On the Thermodynamics of Simple Non-Isentropic Perfect Fluids in General
Relativity | We examine the consistency of the thermodynamics of irrotational and
non-isentropic perfect fluids complying with matter conservation by looking at
the integrability conditions of the Gibbs-Duhem relation. We show that the
latter is always integrable for fluids of the following types: (a) static, (b)
isentropic (admits... | 1994-11-08 | 2010-04-06 | [
"gr-qc"
] | Hernando Quevedo and Roberto Sussman |
gr-qc/9411024 | Gravitational Collapse of Vacuum Gravitational Field Configurations | This paper proves a theorem about the existence of an apparent horizon in
general relativity, which applies equally well to vacuum configurations and
matter configurations. The theorem uses the reciprocal of the surface-to-volume
ratio of a region on a space slice to measure the radius of the region, and
uses the minim... | 1994-11-08 | 2009-10-22 | [
"gr-qc"
] | Douglas M. Eardley (ITP) |
gr-qc/9411016 | Solving the Constraints of General Relativity | I show in this letter that it is possible to solve some of the constraints of
the $SO(3)$-ADM formalism for general relativity by using an approach similar
to the one introduced by Capovilla, Dell and Jacobson to solve the vector and
scalar constraints in the Ashtekar variables framework. I discuss the
advantages of us... | 1994-11-07 | 2017-03-24 | [
"gr-qc"
] | J. Fernando Barbero |
gr-qc/9411014 | Some Remarks on Gravitational Analogs of Magnetic Charge | Existing mathematical results are applied to the problem of classifying
closed $p$-forms which are locally constructed from Lorentzian metrics on an
$n$-dimensional orientable manifold $M$ ($0<p<n$). We show that the only
closed, non-exact forms are generated by representatives of cohomology classes
of $M$ and $(n-1)$-... | 1994-11-07 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | C. G. Torre |
gr-qc/9411015 | Cosmological solution for the problem of rotation velocities in galaxies | A solution for the problem of understanding observed rotation curves in
galaxies without the introduction of dark matter halos is presented. This
solution has been obtained upon considering the distribution of masses in the
expanding universe, then, having a cosmological character. A formal limiting
radius for galaxies... | 1994-11-07 | 2009-09-25 | [
"gr-qc"
] | J.L. Rosales |
gr-qc/9411018 | The Geroch group in the Ashtekar formulation | We study the Geroch group in the framework of the Ashtekar formulation. In
the case of the one-Killing-vector reduction, it turns out that the third
column of the Ashtekar connection is essentially the gradient of the Ernst
potential, which implies that the both quantities are based on the ``same''
complexification. In... | 1994-11-07 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Shun'ya Mizoguchi |
gr-qc/9411013 | Gravity as a Higgs Field. III. Nongravitional Deviations of
Gravitational Fields | In Parts I and II of the work (gr-qc/9405013, 9407032), we have shown that
gravity is {\it sui generis} a Higgs field corresponding to spontaneous
symmetry breaking when the fermion matter admits only the Lorentz subgroup of
world symmetries of the geometric arena. From the mathematical viewpoint, the
Higgs nature of g... | 1994-11-06 | 2007-05-23 | [
"gr-qc"
] | G.Sardanashvily |
gr-qc/9411011 | Crushing singularities in spacetimes with spherical, plane and
hyperbolic symmetry | It is shown that the initial singularities in spatially compact spacetimes
with spherical, plane or hyperbolic symmetry admitting a compact constant mean
curvature hypersurface are crushing singularities when the matter content of
spacetime is described by the Vlasov equation (collisionless matter) or the
wave equation... | 1994-11-04 | 2010-04-06 | [
"gr-qc",
"dg-ga",
"math.DG"
] | Alan D. Rendall |
gr-qc/9411012 | Billiard Representation for Multidimensional Quantum Cosmology near the
Singularity | The degenerate Lagrangian system describing a lot of cosmological models is
considered. When certain restrictions on the parameters of the model are
imposed, the dynamics of the model near the "singularity" is reduced to a
billiard on the Lobachevsky space. The Wheeler-DeWitt equation in the
asymptotical regime is solv... | 1994-11-04 | 2009-10-22 | [
"gr-qc"
] | V. D. Ivashchuk and V. N. Melnikov |
gr-qc/9411008 | A Parallelizable Implicit Evolution Scheme for Regge Calculus | The role of Regge calculus as a tool for numerical relativity is discussed,
and a parallelizable implicit evolution scheme described. Because of the
structure of the Regge equations, it is possible to advance the vertices of a
triangulated spacelike hypersurface in isolation, solving at each vertex a
purely local syste... | 1994-11-03 | 2010-11-01 | [
"gr-qc"
] | John W. Barrett, Mark Galassi, Warner A. Miller, Rafael D. Sorkin,
Philip A. Tuckey and Ruth M. Williams |
gr-qc/9411010 | The Constraints in Spherically Symmetric General Relativity II ---
Identifying the Configuration Space: A Moment of Time Symmetry | We continue our investigation of the configuration space of general
relativity begun in I (gr-qc/9411009). Here we examine the Hamiltonian
constraint when the spatial geometry is momentarily static (MS). We show that
MS configurations satisfy both the positive quasi-local mass (QLM) theorem and
its converse. We derive ... | 1994-11-03 | 2009-10-22 | [
"gr-qc"
] | Jemal Guven and Niall \'O Murchadha |
gr-qc/9411009 | The Constraints in Spherically Symmetric General Relativity I ---
Optical Scalars, Foliations, Bounds on the Configuration Space Variables and
the Positivity of the Quasi-Local Mass | We examine the constraints of spherically symmetric general relativity with
one asymptotically flat region, exploiting both the traditional metric
variables and variables constructed from the optical scalars. With respect to
the latter variables, there exist two linear combinations of the Hamiltonian
and momentum const... | 1994-11-03 | 2009-10-22 | [
"gr-qc"
] | Jemal Guven and Niall \'O Murchadha |
gr-qc/9411005 | Discreteness of area and volume in quantum gravity | We study the operator that corresponds to the measurement of volume, in
non-perturbative quantum gravity, and we compute its spectrum. The operator is
constructed in the loop representation, via a regularization procedure; it is
finite, background independent, and diffeomorphism-invariant, and therefore
well defined on... | 1994-11-02 | 2009-10-22 | [
"gr-qc"
] | Carlo Rovelli and Lee Smolin |
gr-qc/9411006 | Nonsymmetric Gravitational Theory | A new version of nonsymmetric gravitational theory is presented. The field
equations are expanded about the Minkowski metric, giving in lowest order the
linear Einstein field equations and massive Proca field equations for the
antisymmetric field $g_{[\mu\nu]}$. An expansion about an arbitrary Einstein
background metri... | 1994-11-02 | 2009-10-22 | [
"gr-qc"
] | J. W. Moffat |
gr-qc/9411007 | Spin Network States in Gauge Theory | Given a real-analytic manifold M, a compact connected Lie group G and a
principal G-bundle P -> M, there is a canonical `generalized measure' on the
space A/G of smooth connections on P modulo gauge transformations. This allows
one to define a Hilbert space L^2(A/G). Here we construct a set of vectors
spanning L^2(A/G)... | 1994-11-02 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | John C. Baez |
gr-qc/9411003 | Lessons of Quantum 2D Dilaton Gravity | Based on the analysis of two dimensional dilaton gravity we argue that the
semiclassical equations of black hole formation and evaporation should not be
interpreted in terms of expectation values of operators in the exact quantum
theory, but rather as WKB trajectories. Thus at the semiclassical level it does
not seem p... | 1994-11-01 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | S.P. de Alwis, D.A. MacIntire |
gr-qc/9411002 | Classical stability and quantum instability of black-hole Cauchy
horizons | For a certain region of the parameter space $\{M,e,\Lambda\}$, the Cauchy
horizon of a (charged) black hole residing in de Sitter space is classically
stable to gravitational perturbations. This implies that, when left to its own
devices, classical theory is unable to retain full predictive power: the
evolution of phys... | 1994-11-01 | 2009-10-22 | [
"gr-qc"
] | Dragoljub Markovic and Eric Poisson |
gr-qc/9411001 | Action and Hamiltonian for eternal black holes | We present the Hamiltonian, quasilocal energy, and angular momentum for a
spacetime region spatially bounded by two timelike surfaces. The results are
applied to the particular case of a spacetime representing an eternal black
hole. It is shown that in the case when the boundaries are located in two
different wedges of... | 1994-11-01 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Valeri Frolov and Erik A. Martinez |
gr-qc/9411004 | Probabilities Don't Matter | It is suggested that probabilities need not apply at all to matter in the
physical world, which may be entirely described by the amplitudes given by the
quantum mechanical state. Instead, probabilities may apply only to conscious
perceptions in the mental world. Such perceptions may not form unique sequences
that one c... | 1994-11-01 | 2008-02-03 | [
"gr-qc",
"hep-th",
"quant-ph"
] | Don N. Page (CIAR Cosmology Program, University of Alberta) |
gr-qc/9410047 | Gravitons and Lightcone Fluctuations | Gravitons in a squeezed vacuum state, the natural result of quantum creation
in the early universe or by black holes, will introduce metric fluctuations.
These metric fluctuations will introduce fluctuations of the lightcone. It is
shown that when the various two-point functions of a quantized field are
averaged over t... | 1994-10-31 | 2008-11-26 | [
"gr-qc",
"hep-th"
] | L.H. Ford |
gr-qc/9410046 | Pre-Galaxy Formation: A Non-Linear Analysis of the Evolution of
Cosmological Perturbations | A higher-order analysis of the evolution of cosmological perturbations in a
Friedman universe is given by using the PMF method. The essence of the PMF
approach is to choose a gauge where all fluctuations of the density, the
pressure, and the four-velocity vanish. In that gauge, even in higher orders,
the perturbation f... | 1994-10-31 | 2009-10-22 | [
"gr-qc"
] | Martin Schoen |
gr-qc/9410045 | Gauge Gravitation Theory. What is the Geometry of the World? | When joined the unified gauge picture of fundamental interactions, the
gravitation theory leads to geometry of a space-time which is far from
simplicity of pseudo-Riemannian geometry of Einstein's General Relativity. This
is geometry of the affine-metric composite dislocated manifolds. The goal is
modification of the f... | 1994-10-30 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | G.Sardanashvily |
gr-qc/9410044 | Late Time Tail of Wave Propagation on Curved Spacetime | The late time behavior of waves propagating on a general curved spacetime is
studied. The late time tail is not necessarily an inverse power of time. Our
work extends, places in context, and provides understanding for the known
results for the Schwarzschild spacetime. Analytic and numerical results are in
excellent agr... | 1994-10-30 | 2009-10-22 | [
"gr-qc"
] | E.S.C. Ching, P.T. Leung, W.M. Suen and K. Young |
gr-qc/9410043 | Averaged Energy Conditions and Quantum Inequalities | Connections are uncovered between the averaged weak (AWEC) and averaged null
(ANEC) energy conditions, and quantum inequality restrictions on negative
energy for free massless scalar fields. In a two-dimensional compactified
Minkowski universe, we derive a covariant quantum inequality-type bound on the
difference of th... | 1994-10-29 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | L.H. Ford and Thomas A. Roman |
gr-qc/9410040 | Strong cosmic censorship in vacuum space--times with compact, locally
homogeneous Cauchy surfaces | We consider the question of strong cosmic censorship in spatially compact,
spatially locally homogeneous vacuum models. We show in particular that strong
cosmic censorship holds in Bianchi IX vacuum space--times with spherical
spatial topology. | 1994-10-28 | 2009-10-22 | [
"gr-qc"
] | Piotr T. Chru\'sciel, Alan D. Rendall |
gr-qc/9410042 | Asymptotic Symmetry Groups of Long-Ranged Gauge Configurations | We make some general remarks on long-ranged configurations in gauge or
diffeomorphism invariant theories where the fields are allowed to assume some
non vanishing values at spatial infinity. In this case the Gauss constraint
only eliminates those gauge degrees of freedom which lie in the connected
component of asymptot... | 1994-10-28 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | Domenico Giulini |
gr-qc/9410041 | Scattering Processes at the Planck Scale | The ultrarelativistic limit of the Kerr - Newman geometry is studied in
detail. We find the gravitational shock wave background associated with this
limit. We study the scattering of scalar fields in the gravitational shock wave
geometries and compare this with the scattering by ultrarelativistic extended
sources and w... | 1994-10-28 | 2007-05-23 | [
"gr-qc",
"astro-ph",
"hep-th"
] | C.O.Lousto and N.S\'anchez |
gr-qc/9410039 | Dynamical Systems Treatment of Scalar Field Cosmologies | The conformal equivalence of some cosmological models in Brans-Dicke theory
to general relativistic cosmologies with a scalar field is discussed. In the
case of radiation-dominated universes, it is shown that the presence of the
scalar field has a negligible impact upon the evolution of the models in the
Einstein frame... | 1994-10-28 | 2009-09-25 | [
"gr-qc"
] | S. Kolitch and B. Hall |
gr-qc/9410037 | Continuously Diagonalized Density Operatorof Open Systems | We showed several years ago that the density operator of Markovian open
systems can be diagonalized continuously in time. The resulting pure state jump
processes correspond to quantum trajectories proposed in recent quantum optics
calculations or, at fundamental level, to exact consistent histories. | 1994-10-26 | 2007-05-23 | [
"gr-qc"
] | Lajos Diosi |
gr-qc/9410035 | Magnetic Black Hole Pair-Production: One-Loop Tunneling Rate in the Weak
Field Limit | Pair-production of magnetic Reissner-Nordstr\"{o}m black holes (of charges
$\pm q$) is studied in the next-to-leading WKB approximation. We consider
generic quantum fluctuations in the corresponding instanton geometry, a
detailed study of which suggests that, for sufficiently weak field $B$, the
problem can be reduced ... | 1994-10-26 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | Piljin Yi |
gr-qc/9410036 | Quantum Particle As Seen In Light Scattering | A possible mathematical model has been proposed for motion of illuminated
quantum particles seen by eyes or similar devices mapping the scattered light. | 1994-10-26 | 2007-05-23 | [
"gr-qc"
] | Lajos Diosi |
gr-qc/9410038 | Vacuum Weyl Cosmologies in D Dimensions | Vacuum cosmological models are considered in the context of a
multidimensional theory of gravity with integrable Weyl geometry. A family of
exact solutions with a chain of internal spaces is obtained. Models with one
internal space are considered in more detail; nonsingular models are selected. | 1994-10-25 | 2016-08-31 | [
"gr-qc"
] | K.A.Bronnikov and V.N.Melnikov |
gr-qc/9410032 | Exotic black hole solution in teleparallel theory of (2+1)-dimensional
gravity | A black hole solution in a teleparallel theory of (2+1)-dimensional gravity,
given in a previous paper, is examined. This solution is also a solution of the
three-dimensional vacuum Einstein equation with a vanishing cosmological
constant. Remarkable is the fact that this solution gives a black hole in a \lq
\lq flat-l... | 1994-10-24 | 2009-10-22 | [
"gr-qc"
] | Toshiharu Kawai |
gr-qc/9410033 | An Exact Calculation of the Energy Density of Cosmological Gravitational
Waves | In this paper we calculate the Bogoliubov coefficients and the energy density
of the stochastic gravitational wave background for a universe that undergoes
inflation followed by radiation domination and matter domination, using a
formalism that gives the Bogoliubov coefficients as continous functions of
time. By making... | 1994-10-24 | 2019-08-17 | [
"gr-qc"
] | L. E. Mendes, A. B. Henriques and R. G. Moorhouse |
gr-qc/9410034 | Free Energy and Entropy for Semi-classical Black Holes in the Canonical
Ensemble | We consider the thermodynamics of a black hole coupled to thermal radiation
in a spatially finite (spherical) region. Thermodynamic state functions are
derived in the canonical ensemble, defined by elements of radius $r_o$ and
boundary temperature $T(r_o)$. Using recent solutions of the semi-classical
back reaction pro... | 1994-10-24 | 2010-11-01 | [
"gr-qc"
] | David Hochberg |
gr-qc/9410031 | Inconsistent Physics in the Presence of Time Machines | We present a scenario in $1 + 1$ and $3 + 1$ dimensional space time which is
paradoxical in the presence of a time machine. We show that the paradox cannot
be resolved and the scenario has {\em no} consistent classical solution. Since
the system is macroscopic, quantisation is unlikely to resolve the paradox.
Moreover,... | 1994-10-22 | 2009-09-25 | [
"gr-qc",
"hep-th"
] | S. Kalyana Rama and Siddhartha Sen |
gr-qc/9410030 | Stability Properties of the Starobinsky Cosmological Model | We discuss the instabilities appearing in the cosmological model with a quasi
de Sitter phase following from a fourth-order gravity theory. Both the
classical equation as well as the quantization in form of a Wheeler - De Witt
equation are conformally related to the analogous model with Einstein's theory
of gravity wit... | 1994-10-21 | 2007-05-23 | [
"gr-qc"
] | U. Kasper, S. Kluske, M. Rainer, S. Reuter, H.-J. Schmidt |
gr-qc/9410029 | Symmetries, superselection rules, and decoherence | We discuss the applicability of the programme of decoherence -- emergence of
approximate classical behaviour through interaction with the environment -- to
cases where it was suggested that the presence of symmetries would lead to
exact superselection rules. For this discussion it is useful to make a
distinction betwee... | 1994-10-21 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | D. Giulini, C. Kiefer, and H. D. Zeh |
gr-qc/9410028 | Thermodynamic Stability of a Multi-Bubble Cosmological Model | Multibubble solutions for a cosmological model which lead to thermal
inflationary states due to a semi-classical tunneling of gravity are
calculated. | 1994-10-20 | 2007-05-23 | [
"gr-qc"
] | G.Horwitz and O.Fonarev |
gr-qc/9410027 | Decoherence of Friedmann-Robertson-Walker Geometries in the Presence of
Massive Vector Fields with U(1) or SO(3) Global Symmetries | Retrieval of classical behaviour in quantum cosmology is usually discussed in
the framework of {\em midi}superspace models in the presence of scalar fields
and the inhomogeneous modes corresponding either to gravitational or scalar
fields. In this work, we propose an alternative model to study the decoherence
of homoge... | 1994-10-19 | 2010-11-01 | [
"gr-qc"
] | O. Bertolami and P.V. Moniz |
gr-qc/9410026 | Quantum Effects Associated with an Electrically Neutral Massless
Particle in a Bertotti-Robinson Universe | In the present article we obtain, by separation of variables, an exact
solution to the Dirac equation with anomalous momentum for an electrically
neutral massless particle in a Bertotti-Robinson universe. We discuss the
phenomenom of particle creation in this model. | 1994-10-19 | 2009-10-22 | [
"gr-qc"
] | V.M. Villalba |
gr-qc/9410025 | Cosmological Perturbations of Quantum Mechanical Origin and Anisotropy
of the Microwave Background Radiation | A theory of quantum-mechanical generation of cosmological perturbations is
considered. The conclusion of this study is that if the large-angular-scale
anisotropy in the cosmic microwave background radiation is caused by the
long-wavelength cosmological perturbations of quantum mechanical origin, they
are, most likely, ... | 1994-10-18 | 2009-09-25 | [
"gr-qc",
"astro-ph"
] | L. P. Grishchuk |
gr-qc/9410023 | Topology of Event Horizons and Topological Censorship | We prove that, under certain conditions, the topology of the event horizon of
a four dimensional asymptotically flat black hole spacetime must be a 2-sphere.
No stationarity assumption is made. However, in order for the theorem to apply,
the horizon topology must be unchanging for long enough to admit a certain kind
of... | 1994-10-18 | 2010-04-06 | [
"gr-qc",
"hep-th"
] | Ted Jacobson and Shankar Venkataramani |
gr-qc/9410019 | The Dipole Coupling of Atoms and Light in Gravitational Fields | The dipole coupling term between a system of N particles with total charge
zero and the electromagnetic field is derived in the presence of a weak
gravitational field. It is shown that the form of the coupling remains the same
as in flat space-time if it is written with respect to the proper time of the
observer and to... | 1994-10-17 | 2009-10-22 | [
"gr-qc"
] | Karl-Peter Marzlin |
gr-qc/9410021 | Black Holes in Three Dimensional Topological Gravity | We investigate the black hole solution to (2+1)-dimensional gravity coupled
to topological matter, with a vanishing cosmological constant. We calculate the
total energy, angular momentum and entropy of the black hole in this model and
compare with results obtained in Einstein gravity. We find that the theory with
topol... | 1994-10-17 | 2010-04-28 | [
"gr-qc"
] | S. Carlip, J. Gegenberg, R.B.Mann |
gr-qc/9410020 | Particle Creation If a Cosmic String Snaps | We calculate the Bogolubov coefficients for a metric which describes the
snapping of a cosmic string. If we insist on a matching condition for all times
{\it and} a particle interpretation, we find no particle creation. | 1994-10-17 | 2015-06-25 | [
"gr-qc"
] | A. H. Bilge, M. Hortacsu, N. Ozdemir |
gr-qc/9410022 | Do Cosmic Strings Give Rise to Vacuum Fluctuations ? | The role of the identification of the vacuum and non-vacuum space-times in
the computation of vacuum fluctuations in the presence of a cosmic string is
discussed and an alternative interpretation of the renormalization is proposed.
This procedure does not give rise to vacuum fluctuations. | 1994-10-17 | 2007-05-23 | [
"gr-qc"
] | A. H. Bilge, M. Hortacsu, N. Ozdemir |
gr-qc/9410024 | A New Formula for the Mass of a Stationary Axisymmetric Configuration | It has been shown by one of the authors$^1$ that in isotropic spherical
coordinates there is a relation between the mass of a static spherical
gravitating body and the pressure distribution inside it. In this paper the
result is generalized for the case of stationary axisymmetric configurations. | 1994-10-17 | 2015-06-25 | [
"gr-qc"
] | R. M. Avakian and G. Oganessyan |
gr-qc/9410016 | Non-Abelian Black Holes and Catastrophe Theory II: Charged Type | We reanalyze the gravitating monopole and its black hole solutions in the
Einstein-Yang-Mills-Higgs system and we discuss their stabilities from the
point of view of catastrophe theory. Although these non-trivial solutions
exhibit fine and complicated structures, we find that stability is
systematically understood via ... | 1994-10-13 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-th"
] | T. Tachizawa, K. Maeda, and T. Torii |
gr-qc/9410018 | Knots and Quantum Gravity: Progress and Prospects | Recent work on the loop representation of quantum gravity has revealed
previously unsuspected connections between knot theory and quantum gravity, or
more generally, 3-dimensional topology and 4-dimensional generally covariant
physics. We review how some of these relationships arise from a `ladder of
field theories' in... | 1994-10-13 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | John Baez |
gr-qc/9410017 | The inequivalence of thermodynamic ensembles | The inequivalence of thermodynamical ensembles related by a Legendre
transformation is manifest in self-gravitating systems and in black hole
thermodynamics. Using the Poincare's method of the linear series, we describe
the mathematical reasons which lead to this inequivalence which in turn induces
a hierarchy of ensem... | 1994-10-13 | 2009-09-25 | [
"gr-qc"
] | Parentani Renaud |
gr-qc/9410015 | Thermodynamics of a black hole in a cavity | We present a unified thermodynamical description of the configurations
consisting on self-gravitating radiation with or without a black hole. We
compute the thermal fluctuations and evaluate where will they induce a
transition from metastable configurations towards stable ones. We show that the
probability of finding s... | 1994-10-12 | 2010-04-06 | [
"gr-qc"
] | Renaud Parentani, Joseph Katz and Isao Okamoto |
gr-qc/9410014 | Real Ashtekar Variables for Lorentzian Signature Space-times | I suggest in this letter a new strategy to attack the problem of the reality
conditions in the Ashtekar approach to classical and quantum general
relativity. By writing a modified Hamiltonian constraint in the usual $SO(3)$
Yang-Mills phase space I show that it is possible to describe space-times with
Lorentzian signat... | 1994-10-11 | 2017-03-24 | [
"gr-qc"
] | J. Fernando Barbero |
gr-qc/9410013 | Reality Conditions and Ashtekar Variables: a Different Perspective | We give in this paper a modified self-dual action that leads to the
$SO(3)$-ADM formalism without having to face the difficult second class
constraints present in other approaches (for example if one starts from the
Hilbert-Palatini action). We use the new action principle to gain some new
insights into the problem of ... | 1994-10-11 | 2017-03-24 | [
"gr-qc"
] | J. Fernando Barbero |
gr-qc/9410011 | A tensorial Lax pair equation and integrable systems in relativity and
classical mechanics | It is shown that the Lax pair equation dL/dt = [L,A] can be given a neat
tensorial interpretation for finite-dimensional quadratic Hamiltonians. The Lax
matrices L and A are shown to arise from third rank tensors on the
configuration space. The second Lax matrix A is related to a connection which
characterizes the Hami... | 1994-10-11 | 2007-05-23 | [
"gr-qc"
] | Kjell Rosquist |
gr-qc/9410012 | Signature change induces compactification | It is shown -- using a FRW model with ${\bf S}^3 \times {\bf S}^6$ as spatial
sections and a positive cosmological constant -- that classical signature
change implies a new compactification mechanism. The internal scale factor is
of the order $\Lambda^{-1/2}$, and the solutions are stable against small
perturbatons. In... | 1994-10-11 | 2010-11-01 | [
"gr-qc"
] | Franz Embacher |
gr-qc/9410010 | A reformulation of the Ponzano-Regge quantum gravity model in terms of
surfaces | We reformulate the Ponzano-Regge quantum gravity model in terms of surfaces
on a 3-dimensional simplex lattice. This formulation (1) has a clear relation
to the loop representation of the canonical quantum general relativity in
3-dimensions, (2) may have a 4-dimensional analogue, in contrast to the 6-j
symbolic formali... | 1994-10-10 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | Junichi Iwasaki (University of Pittsburgh) |
gr-qc/9410008 | Quantum Complex Scalar Field in the Two-Dimensional Spacetime with
Closed Timelike Curves and a Time-Machine Problem | It is considered the quantum complex scalar field which obeys the
authomorphic condition in the two-dimensional spacetime with closed timelike
curves and the chronology horizon. The renormalized stress-energy tensor is
obtained. It is shown that the value of the stress-energy tensor is regular at
the chronology horizon... | 1994-10-07 | 2010-04-06 | [
"gr-qc"
] | Sergey Sushkov |
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