id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
|---|---|---|---|---|---|---|
gr-qc/9410007 | Decoherence on Quantum Tunneling in the Multi-Dimensional Wave Function
Approach | We consider fundamental problems on the understanding of the tunneling
phenomena in the context of the multi-dimensional wave function. In this paper,
we reconsider the quantum state after tunneling and extend our previous
formalism to the case when the quantum state before tunneling is in a squeezed
state. Through con... | 1994-10-07 | 2010-11-01 | [
"gr-qc"
] | Takahiro Tanaka |
gr-qc/9410009 | Short-distance Cut-off from the Quantum Dynamics of Fields in a Black
Hole Spacetime | We stress the strongly observer-dependent nature of the fine-grained black
hole entropy as computed by usual methods. From the point of view of a fiducial
observer, the 1-loop renormalized energy-momentum tensor diverges at the
horizon. Considering, more consistently, the computation of the black hole
entropy in the ba... | 1994-10-07 | 2009-09-25 | [
"gr-qc",
"astro-ph",
"hep-th"
] | C.O. Lousto |
gr-qc/9410006 | Conservation Laws in the Quantum Mechanics of Closed Systems | We investigate conservation laws in the quantum mechanics of closed systems.
We review an argument showing that exact decoherence implies the exact
conservation of quantities that commute with the Hamiltonian including the
total energy and total electric charge. However, we also show that decoherence
severely limits th... | 1994-10-06 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | James B. Hartle, Raymond Laflamme, Donald Marolf |
gr-qc/9410004 | On the topology of stationary black holes | We prove that the domain of outer communication of a stationary, globally
hyperbolic spacetime satisfying the null energy condition must be simply
connected. Under suitable additional hypotheses, this implies, in particular,
that each connected component of a cross-section of the event horizon of a
stationary black hol... | 1994-10-05 | 2010-04-06 | [
"gr-qc"
] | P.T. Chrusciel, R.M. Wald |
gr-qc/9410005 | Bosonic physical states in N=1 supergravity? | It is argued that states in $N=1$ supergravity that solve all of the
constraint equations cannot be bosonic in the sense of being independent of the
fermionic degrees of freedom. (Based on a talk given by Miguel Ortiz at the 7th
Marcel Grossmann Meeting.) | 1994-10-05 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | S. M. Carroll, D. Z. Freedman, M. E. Ortiz and D. N. Page |
gr-qc/9410002 | Can Galactic Observations Be Explained by a Relativistic Gravity Theory? | We consider the possibility of an alternative gravity theory explaining the
dynamics of galactic systems without dark matter. From very general assumptions
about the structure of a relativistic gravity theory we derive a general
expression for the metric to order $(v/c)^2$. This allows us to compare the
predictions of ... | 1994-10-04 | 2009-10-22 | [
"gr-qc"
] | Vadim V. Zhytnikov and James M. Nester |
gr-qc/9410003 | Initial Data for General Relativity with Toroidal Conformal Symmetry | A new class of time-symmetric solutions to the initial value constraints of
vacuum General Relativity is introduced. These data are globally regular,
asymptotically flat (with possibly several asymptotic ends) and in general have
no isometries, but a $U(1)\times U(1)$ group of conformal isometries. After
decomposing th... | 1994-10-04 | 2009-12-30 | [
"gr-qc"
] | Robert Beig and Sascha Husa |
gr-qc/9410001 | Fermi-Walker coordinates in 2+1 dimensional gravity | It is shown that in 2+1 dimensions the Fermi-Walker gauge allows the general
solution of the problem of determining the metric from the sources in terms of
simple quadratures. This technique is used to solve the problem of the
occurrence of closed time like curves (CTC's) in stationary solutions. In fact
the Fermi-Walk... | 1994-10-03 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | P. Menotti and D. Seminara |
gr-qc/9409062 | The Final Fate of Spherical Inhomogeneous Dust Collapse | We examine the role of the initial density and velocity distribution in the
gravitational collapse of a spherical inhomogeneous dust cloud. Such a collapse
is described by the Tolman-Bondi metric which has two free functions: the
`mass-function' and the `energy function', which are determined by the initial
density and... | 1994-09-30 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-th"
] | T. P. Singh and P. S. Joshi |
gr-qc/9409059 | On a possible solution for the Polonyi problem in string cosmology | We establish the main features of homogeneous and isotropic dilaton, metric
and Yang-Mills configurations in a cosmological framework. We identify a new
energy exchange term between the dilaton and the Yang-Mills field which may
lead to a possible solution to the Polonyi problem in 4-dimensional string
models. | 1994-09-29 | 2007-05-23 | [
"gr-qc"
] | M. C. Bento and O. Bertolami |
gr-qc/9409060 | Modification of the Coulomb potential from a Kaluza-Klein model with a
Gauss-Bonnet term in the action | In four dimensions a Gauss-Bonnet term in the action corre- sponds to a total
derivative, and it does not contribute to the classical equations of motion.
For higher-dimensional geometries this term has the interesting property
(shared with other dimensionally continued Euler densities) that when the
action is varied w... | 1994-09-29 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | H. H. Soleng and O. Gron |
gr-qc/9409061 | What is the reference frame of an accelerated observer? | The general construction of extended refrence frames for noninertial
observers in flat space is studied. It is shown that, if the observer moves
inertially before and after an arbitrary acceleration and rotation, the region
where reference frames can coincide with an inertial system is bounded for
final velocities exce... | 1994-09-29 | 2009-10-22 | [
"gr-qc"
] | K.-P. Marzlin |
gr-qc/9409058 | A Quantum-Driven Time (QDT) Quantization of the Taub Cosmology | We present here an application of a new quantization scheme. We quantize the
Taub cosmology by quantizing only the anisotropy parameter $\beta$ and imposing
the super-Hamiltonian constraint as an expectation-value equation to recover
the relationship between the scale factor $\Omega$ and the time $t$. This
approach app... | 1994-09-28 | 2007-05-23 | [
"gr-qc"
] | Arkady Kheyfets and Warner A. Miller |
gr-qc/9409055 | Effects of weak self-interactions in a relativistic plasma on
cosmological perturbations | The exact solutions for linear cosmological perturbations which have been
obtained for collisionless relativistic matter within thermal field theory are
extended to a self-interacting case. The two-loop contributions of scalar
$\lambda\phi^4$ theory to the thermal graviton self-energy are evaluated, which
give the $O(\... | 1994-09-27 | 2009-12-30 | [
"gr-qc",
"astro-ph",
"hep-ph"
] | H. Nachbagauer, A. K. Rebhan, D. J. Schwarz |
gr-qc/9409054 | Gravitational Waves from a Particle Orbiting Around a Rotating Black
Holes: Post-Newtonian Expansion | Using the Teukolsky and Sasaki-Nakamura equations for the gravitational
perturbation of the Kerr spacetime, we calculate the post-Newtonian expansion
of the energy and angular momentum luminosities of gravitational waves from a
test particle orbiting around a rotating black hole up through ${\rm P^{5/2}N}$
order beyond... | 1994-09-27 | 2009-10-09 | [
"gr-qc",
"astro-ph"
] | Masaru Shibata, Misao Sasaki, Hideyuki Tagoshi and Takahiro Tanaka |
gr-qc/9409056 | Conditions for inflation in an initially inhomogeneous universe | Using a long wavelength iteration scheme to solve Einstein's equations near
the Big-Bang singularity of a universe driven by a massive scalar field, we
find how big initial quasi-isotropic inhomogeneities can be before they can
prevent inflation to set in. | 1994-09-27 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Nathalie Deruelle and Dalia S. Goldwirth |
gr-qc/9409053 | Nonequilibrium Quantum Fields in Cosmology: Comments on Selected Current
Topics | Concepts of quantum open systems and ideas of correlation dynamics in
nonequilibrium statistical mechanics, as well as methods of closed-time-path
effective action and influence functional in quantum field theory can be
usefully applied for the analysis of quantum statistical processes in
gravitation and cosmology. We ... | 1994-09-27 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | B. L. Hu (Department of Physics, University of Maryland, College Park,
MD and Institute for Advanced Study, Princeton, New Jersey, USA) |
gr-qc/9409057 | Gravitational Radiation from Nonaxisymmetric Instability in a Rotating
Star | We present the first calculations of the gravitational radiation produced by
nonaxisymmetric dynamical instability in a rapidly rotating compact star. The
star deforms into a bar shape, shedding $\sim 4\%$ of its mass and $\sim 17\%$
of its angular momentum. The gravitational radiation is calculated in the
quadrupole a... | 1994-09-27 | 2009-01-23 | [
"gr-qc",
"astro-ph"
] | J. L. Houser, J. M. Centrella, and S. C. Smith |
gr-qc/9409052 | The Statistical Mechanics of the (2+1)-Dimensional Black Hole | The presence of a horizon breaks the gauge invariance of (2+1)-dimensional
general relativity, leading to the appearance of new physical states at the
horizon. I show that the entropy of the (2+1)-dimensional black hole can be
obtained as the logarithm of the number of these microscopic states. | 1994-09-26 | 2010-04-28 | [
"gr-qc",
"hep-th"
] | S. Carlip |
gr-qc/9409050 | Higgs Mechanism and the Structure of the Energy-Momentum Tensor in
Einstein Gravity and Conformal Gravity | In the standard treatment of the Einstein gravitational theory the
energy-momentum tensor has always been taken to be composed of perfect fluid
aggregates of kinematic Newtonian point test particles with fundamental
mechanical masses. Moreover, this standard prescription was not revised after
the discovery of the mass-... | 1994-09-23 | 2007-05-23 | [
"gr-qc"
] | Philip D. Mannheim (University of Connecticut) and Demosthenes Kazanas
(NASA/Goddard Space Flight Center) |
gr-qc/9409049 | Observables and a Hilbert Space for Bianchi IX | We consider a quantization of the Bianchi IX cosmological model based on
taking the constraint to be a self-adjoint operator in an auxiliary Hilbert
space. Using a WKB-style self-consistent approximation, the constraint chosen
is shown to have only continuous spectrum at zero. Nevertheless, the auxiliary
space induces ... | 1994-09-23 | 2010-04-06 | [
"gr-qc"
] | Donald Marolf |
gr-qc/9409051 | A Three-Dimensional Hydrodynamics Code for Modeling Sources of
Gravitational Radiation | We have developed a 3-D Eulerian hydrodynamics code to model sources of
gravitational radiation. The code is written in cylindrical coordinates
$(\varpi,z,\varphi)$ and has moving grids in the $\varpi$ and $z$-directions.
We use Newtonian gravity and calculate the gravitational radiation in the
quadrupole approximation... | 1994-09-23 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | Scott C. Smith, Joan M. Centrella, and Sean P. Clancy |
gr-qc/9409048 | Infinite Blueshift of Charged Null Particles | We demonstrate that charged null particles can be infinitely blue\-shifted in
a Kerr-Newman spacetime. The surface of infinite blueshift can be outside of
the ergosphere in a Kerr-Newman spacetime, and outside of the outer event
horizon for a Reissner-Nordstrom spacetime. Implications for extensions of the
standard mod... | 1994-09-22 | 2008-02-03 | [
"gr-qc",
"hep-ph"
] | R.B. Mann and W.N. Sajko |
gr-qc/9409046 | The General Self-dual solution of the Einstein Equations | We obtain the most general explicit (anti)self-dual solution of the Einstein
equations. We find that any (anti)self-dual solution can be characterised by
three free functions of which one is harmonic. Any stationary (anti)self-dual
solution can be characterised by a harmonic function. It turns out that the
form of the ... | 1994-09-21 | 2007-05-23 | [
"gr-qc"
] | Sucheta Koshti and Naresh Dadhich |
gr-qc/9409045 | An Analytic Model with Critical Behavior in Black Hole Formation | A simple analytic model is presented which exhibits a critical behavior in
black hole formation, namely, collapse of a thin shell coupled with outgoing
null fluid. It is seen that the critical behavior is caused by the
gravitational nonlinearity near the event horizon. We calculate the value of
the critical exponent an... | 1994-09-21 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Tatsuhiko Koike and Takashi Mishima |
gr-qc/9409047 | Embedding initial data for black hole collisions | We discuss isometric embedding diagrams for the visualization of initial data
for the problem of the head-on collision of two black holes. The problem of
constructing the embedding diagrams is explicitly presented for the best
studied initial data, the Misner geometry. We present a partial solution of the
embedding dia... | 1994-09-21 | 2010-04-06 | [
"gr-qc"
] | Joseph D. Romano and Richard H. Price |
gr-qc/9409043 | Scale anomalies imply violation of the averaged null energy condition | Considerable interest has recently been expressed regarding the issue of
whether or not quantum field theory on a fixed but curved background spacetime
satisfies the averaged null energy condition (ANEC). A comment by Wald and
Yurtsever [Phys. Rev. D43, 403 (1991)] indicates that in general the answer is
no. In this no... | 1994-09-20 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Matt Visser |
gr-qc/9409041 | Cosmological solutions of the Vlasov-Einstein system with spherical,
plane, and hyperbolic symmetry | The Vlasov-Einstein system describes a self-gravitating, collisionless gas
within the framework of general relativity. We investigate the initial value
problem in a cosmological setting with spherical, plane, or hyperbolic symmetry
and prove that for small initial data solutions exist up to a spacetime
singularity whic... | 1994-09-20 | 2015-06-25 | [
"gr-qc"
] | Gerhard Rein |
gr-qc/9409044 | Is there a connection between no-hair behavior and universality in
gravitational collapse? | We apply linear perturbation theory to the study of the universality and
criticality first observed by Choptuik in gravitational collapse. Since these
are essentially nonlinear phenomena our attempt is only a rough approximation.
In spite of this, universal behavior of the final black hole mass is observed
with an expo... | 1994-09-20 | 2009-10-22 | [
"gr-qc"
] | Jorge Pullin |
gr-qc/9409042 | Decoherence of Homogeneous and Isotropic Metrics in the Presence of
Massive Vector Fields | Retrieval of classical behaviour in quantum cosmology is usually discussed in
the framework of minisuperspace models in the presence of scalar fields
together with the inhomogeneous modes either of the gravitational or of the
scalar fields. In this work we propose alternatively a model where the scalar
field is replace... | 1994-09-20 | 2007-05-23 | [
"gr-qc"
] | O. Bertolami and P.V. Moniz |
gr-qc/9409039 | Spherically Symmetric Solutions in M\o ller's Tetrad Theory of
Gravitation | The general solution of M\o ller's field equations in case of spherical
symmetry is derived. The previously obtained solutions are verified as special
cases of the general solution. | 1994-09-19 | 2008-11-26 | [
"gr-qc"
] | F. I. Mikhail, M. I. Wanas, E. I. Lashin, and Ahmed Hindawi |
gr-qc/9409040 | A remark on kinks and time machines | We describe an elementary proof that a manifold with the topology of the
Politzer time machine does not admit a nonsingular, asymptotically flat Lorentz
metric. | 1994-09-19 | 2009-10-22 | [
"gr-qc"
] | Ulvi Yurtsever |
gr-qc/9409038 | The Gravitational and Electrostatic Fields Far from an Isolated
Einstein-Maxwell Source | The exterior solution for an arbitrary charged, massive source, is studied as
a static deviation from the Reissner-Nordstr\o m metric. This is reduced to two
coupled ordinary differential equations for the gravitational and electrostatic
potential functions. The homogeneous equations are explicitly solved in the
partic... | 1994-09-18 | 2009-10-22 | [
"gr-qc"
] | J. Ocariz, H. Rago |
gr-qc/9409037 | Properties of Consistent Histories | We describe some properties of consistent sets of histories in the
Gell-Mann--Hartle formalism, and give an example to illustrate that one cannot
recover the standard predictions, retrodictions and inferences of
quasiclassical physics using the criterion of consistency alone. | 1994-09-17 | 2018-07-17 | [
"gr-qc",
"hep-th",
"quant-ph"
] | Fay Dowker, Adrian Kent |
gr-qc/9409036 | The Spectral Analysis Inner Product for Quantum Gravity | This submission to the Proceedings of the Seventh Marcel-Grossman Conference
is an advertisement for the use of the ``spectral analysis inner product" for
minisuperspace models in quantum gravity. | 1994-09-16 | 2007-05-23 | [
"gr-qc"
] | Donald Marolf |
gr-qc/9409034 | Inside a Spinning Black String | We show that mass inflation occurs inside spinning black cosmic string, which
is a solution of a low-energy effective string theory in $(3+1)$-dimensions.
This confirms Poisson and Israel's conjecture that the inner mass parameter
diverges even if spacetime is not spherically symmetric. | 1994-09-16 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | J.S.F. Chan and R.B. Mann |
gr-qc/9409035 | Self-Similar Scalar Field Collapse: Naked Singularities and Critical
Behaviour | Homothetic scalar field collapse is considered in this article. By making a
suitable choice of variables the equations are reduced to an autonomous system.
Then using a combination of numerical and analytic techniques it is shown that
there are two classes of solutions. The first consists of solutions with a
non-singul... | 1994-09-16 | 2009-10-22 | [
"gr-qc"
] | Patrick R Brady |
gr-qc/9409033 | Massive Superstrings are Black Holes | We argue that it is inconsistent to ignore the gravitational backreaction for
on-shell superstring states at the Planck mass and beyond, and that these
quantum states become Kerr black holes in the classical limit. Consequences are
discussed. | 1994-09-15 | 2009-10-22 | [
"gr-qc",
"astro-ph",
"hep-ph",
"hep-th"
] | Paul H. Frampton and Thomas W. Kephart |
gr-qc/9409032 | Extrinsic Time in Quantum Cosmology | An extrinsic time is identified in most isotropic and homogeneous
cosmological models by matching them with the ideal clock - a parametrized
system whose only "degree of freedom" is time -. Once this matching is
established, the cosmological models are quantized in the same way as the ideal
clock. The space of solution... | 1994-09-14 | 2009-10-22 | [
"gr-qc"
] | S.C.Beluardi and Rafael Ferraro |
gr-qc/9409028 | On maximum number of decoherent histories | It is shown that $N^2$ is the upper limit for the number of histories in a
decohering family of $N$-state quantum system. Simple criterion is found for a
family of $N^2$ fine grained decohering histories of Gell-Mann and Hartle to be
identical with a family of Griffiths' consistent quantum trajectories. | 1994-09-14 | 2008-02-03 | [
"gr-qc"
] | Lajos Diosi |
gr-qc/9409029 | A Method for Calculating the Structure of (Singular) Spacetimes in the
Large | A formalism and its numerical implementation is presented which allows to
calculate quantities determining the spacetime structure in the large directly.
This is achieved by conformal techniques by which future null infinity
($\Scri{}^+$) and future timelike infinity ($i^+$) are mapped to grid points on
the numerical g... | 1994-09-14 | 2010-11-01 | [
"gr-qc"
] | Peter Huebner |
gr-qc/9409030 | Black holes cannot support conformal scalar hair | It is shown that the only static asymptotically flat non-extrema black hole
solution of the Einstein-conformally invariant scalar field equations having
the scalar field bounded on the horizon, is the Schwarzschild one. Thus black
holes cannot be endowed with conformal scalar hair of finite length. | 1994-09-14 | 2014-11-17 | [
"gr-qc"
] | T. Zannias |
gr-qc/9409031 | Bibliography of Publications related to Classical and Quantum Gravity in
terms of the Ashtekar Variables | This bibliography attempts to give a comprehensive overview of all the
literature related to the Ashtekar variables. The original version was compiled
by Peter H\"ubner in 1989, and it has been subsequently updated by Gabriela
Gonzalez, Bernd Br\"ugmann, and Troy Schilling. Information about additional
literature, new ... | 1994-09-14 | 2007-05-23 | [
"gr-qc"
] | Troy A. Schilling |
gr-qc/9409024 | The Role of the Apparent Horizon in the Evolution of Robinson-Trautman
%%EINSTEIN-Maxwell Spacetimes | The `runaway solutions' of the Lorentz-Dirac equation of a charged particle
interacting with its own field in classical electrodynamics are well-known.
This type of self accelerated phenomena also exists in the solutions of the
Einstein-Maxwell equations in general relativity. In particular, runaway
solutions occur in ... | 1994-09-13 | 2007-05-23 | [
"gr-qc"
] | Anthony W.C.Lun and Ernest W.M.Chow |
gr-qc/9409025 | The Bianchi Ix (MIXMASTER) Cosmological Model is Not Integrable | The perturbation of an exact solution exhibits a movable transcendental
essential singularity, thus proving the nonintegrability. Then, all possible
exact particular solutions which may be written in closed form are isolated
with the perturbative Painlev\'e test; this proves the inexistence of any
vacuum solution other... | 1994-09-13 | 2007-05-23 | [
"gr-qc"
] | A.~Latifi (Universit\'e libre de Bruxelles), M.~Musette (Vrije
Universiteit Brussel) and R.~Conte (CEA, Centre d'\'etudes de Saclay) |
gr-qc/9409022 | Spinors and the reference point of quasilocal energy | This paper investigates the relationship between the quasilocal energy of
Brown and York and certain spinorial expressions for gravitational energy
constructed from the Witten-Nester integral. A key feature of the Brown-York
method for defining quasilocal energy is that it allows for the freedom to
assign the reference... | 1994-09-13 | 2010-04-06 | [
"gr-qc"
] | Stephen R. Lau |
gr-qc/9409026 | Quantum Fluctuations of Planck Mass as Mutation Mechanism in a Theory of
Evolution of the Universe | Contributed talk at the Seventh Marcel Grossman Meeting on Gravity, June
24-30. A theory of evolution of the universe requires both a mutation mechanism
and a selection mechanism. We believe that both can be encountered in the
stochastic approach to quantum cosmology. In Brans-Dicke chaotic inflation, the
quantum fluct... | 1994-09-13 | 2007-05-23 | [
"gr-qc",
"astro-ph"
] | Juan Garcia-Bellido |
gr-qc/9409027 | Gravitational Analog of the Aharonov-Casher Effect | The gravitational interaction between a massive particle and a spinning
particle in the weak-field limit is studied. We show that a system of a
spinning point-like particle and a massive rod exhibit a topological effect
analogous to the electromagnetic Aharonov-Casher effect. We discuss the effect
also for systems with... | 1994-09-13 | 2009-10-22 | [
"gr-qc"
] | Benni Reznik |
gr-qc/9409023 | Evaporating Black Holes And An Entropic Scale-Hierarchy | It is argued that a characteristic length may be associated with the entropic
state of a spherically symmetric black hole in the cosmological context. This
length is much smaller than the Schwarzschild-radius of a black hole and may
act as a regulator of arbitrarily high frequencies apparently entering the
usual deriva... | 1994-09-12 | 2007-05-23 | [
"gr-qc"
] | Hadi Salehi |
gr-qc/9409021 | What Cavities? | Most spherical thin shells, enclosing black body radiation satisfy the
dominant energy condition if they have at least $\simeq 30\%$ of the total
mass-energy. Containers with less mass energy, able to sustain high pressures,
contain mostly unstable radiation. If they have negligible mass energy they are
unable to susta... | 1994-09-12 | 2010-04-06 | [
"gr-qc"
] | Joseph Katz and Yasunari Okuta |
gr-qc/9409020 | Exact Einstein-scalar field solutions for formation of black holes in a
cosmological setting | We consider self-interacting scalar fields coupled to gravity. Two classes of
exact solutions to Einstein's equations are obtained: the first class
corresponds to the minimal coupling, the second one to the conformal coupling.
One of the solutions is shown to describe a formation of a black hole in a
cosmological setti... | 1994-09-11 | 2010-04-06 | [
"gr-qc",
"astro-ph",
"hep-th"
] | Oleg A. Fonarev |
gr-qc/9409018 | How Objective is Black Hole Entropy? | The objectivity of black hole entropy is discussed in the particular case of
a Schwarzchild black hole. Using Jaynes' maximum entropy formalism and
Euclidean path integral evaluation of partition function, it is argued that in
the semiclassical limit when the fluctutation of metric is neglected, the black
hole entropy ... | 1994-09-10 | 2007-05-23 | [
"gr-qc"
] | Y.K.Lau |
gr-qc/9409019 | Anomaly In 2d-Gravity Coupled To Matter Fields | In 1+1 dimensions, the Wheeler-DeWitt equation cannot be imposed owing to an
anomaly in its commutator with the diffeomorphism constraint. A similar
obstruction prevents also a semiclassical definition of a WKB local time. (Talk
given at the 7th Marcel Grossman Meeting on General Relativity, Stanford, July
28, 1994.) | 1994-09-10 | 2008-02-03 | [
"gr-qc"
] | Daniel Cangemi |
gr-qc/9409016 | Comments on the multi-dimensional Wheeler-DeWitt equation | It is argued heuristically -- using an ${\bf S}^3 \times {\bf S}^6$
minisuperspace model -- that there might be a fundamental quantum gravity
effect stabilizing internal spaces with non-vanishing Ricci curvature. | 1994-09-09 | 2009-09-25 | [
"gr-qc"
] | Franz Embacher |
gr-qc/9409017 | Critique of weakly decohering and linearly positive histories | The usual composition rule of independent systems, as applied to decoherent
histories or to linearly positive histories, requires (at least) medium
decoherence and, consequently, a second constraint for the linearly positive
histories of Goldstein and Page. Other plausible classical features, valid for
medium decoheren... | 1994-09-09 | 2007-05-23 | [
"gr-qc"
] | Lajos Diosi |
gr-qc/9409013 | Entropy, Area, and Black Hole Pairs | We clarify the relation between gravitational entropy and the area of
horizons. We first show that the entropy of an extreme Reissner-Nordstr\"om
black hole is $zero$, despite the fact that its horizon has nonzero area. Next,
we consider the pair creation of extremal and nonextremal black holes. It is
shown that the ac... | 1994-09-08 | 2008-11-26 | [
"gr-qc",
"hep-th"
] | S. W. Hawking, Gary T. Horowitz, and Simon F. Ross |
gr-qc/9409014 | Consistency of Semiclassical Gravity | We discuss some subtleties which arise in the semiclassical approximation to
quantum gravity. We show that integrability conditions prevent the existence of
Tomonaga-Schwinger time functions on the space of three-metrics but admit them
on superspace. The concept of semiclassical time is carefully examined. We
point out... | 1994-09-08 | 2010-04-06 | [
"gr-qc"
] | D. Giulini and C. Kiefer |
gr-qc/9409015 | Do We Understand Black Hole Entropy ? | I review various proposals for the nature of black hole entropy and for the
mechanism behind the operation of the generalized second law. I stress the
merits of entanglement entropy {\tenit qua\/} black hole entropy, and point out
that, from an operational viewpoint, entanglement entropy is perfectly finite.
Problems w... | 1994-09-08 | 2009-09-25 | [
"gr-qc",
"astro-ph",
"hep-th"
] | Jacob D. Bekenstein |
gr-qc/9409012 | The No-Boundary Wave Function and the Duration of the Inflationary
Period | For the simplest minisuperspace model based on a homogeneous, isotropic
metric and a minimally coupled scalar field we derive analytic expressions for
the caustic which separates Euklidean and Minkowskian region and its breakdown
value $\p_*$. This value represents the prediction of the no-boundary wave
function for th... | 1994-09-07 | 2008-11-26 | [
"gr-qc"
] | A. Lukas |
gr-qc/9409008 | Dumb Holes and the Effects of High Frequencies on Black Hole Evaporation | The naive calculation of black hole evaporation makes the thermal emission
depend on the arbitrary high frequency behaviour of the theory where the theory
is certainly wrong. Using the sonic analog to black holes-- dumb holes-- I show
numerically that a change in the dispersion relation at high frequencies does
not see... | 1994-09-06 | 2009-10-22 | [
"gr-qc"
] | W. G. Unruh (Univ. of BC) |
gr-qc/9409011 | Lifetimes of spherically symmetric closed universes | It is proven that any spherically symmetric spacetime that possesses a
compact Cauchy surface $\Sigma$ and that satisfies the dominant-energy and
non-negative-pressures conditions must have a finite lifetime in the sense that
all timelike curves in such a spacetime must have a length no greater than $10
\max_\Sigma(2m)... | 1994-09-06 | 2010-11-01 | [
"gr-qc"
] | Gregory A. Burnett |
gr-qc/9409009 | Global Properties of Locally Spatially Homogeneous Cosmological Models
with Matter | The existence and nature of singularities in locally spatially homogeneous
solutions of the Einstein equations coupled to various phenomenological matter
models is investigated. It is shown that, under certain reasonable assumptions
on the matter, there are no singularities in an expanding phase of the
evolution and th... | 1994-09-06 | 2015-06-25 | [
"gr-qc"
] | Alan D. Rendall |
gr-qc/9409007 | Essay on mesoscopic and quantum brain | In the pure essay style (no mathematical formulas), I present a number of
speculative reflections and suggestions on possible applications of mesoscopic
methods and of quantum mechanical concepts to as such a complex system as the
human brain. As an initial guide for this essay I used ``The Emperor's New
Mind" of Roger... | 1994-09-05 | 2008-02-03 | [
"gr-qc"
] | H.C. Rosu |
gr-qc/9409006 | Topology Changes by Quantum Tunneling in Four Dimensions | We investigate topology-changing processes in 4-dimensional quantum gravity
with a negative cosmological constant. By playing the ``gluing-polytope game"
in hyperbolic geometry, we explicitly construct an instanton-like solution
without singularity. Because of cusps, this solution is non-compact but has a
finite volume... | 1994-09-05 | 2019-08-15 | [
"gr-qc",
"hep-th"
] | Ding Shuxue, Yasushige Maeda and Masaru Siino |
gr-qc/9409010 | Indeterministic Quantum Gravity | A theory which claims to describe all the universe is advanced. It unifies
general relativity, quantum field theory, and indeterministic conception. Basic
entities are: classical metric tensor $g$, cosmic reference frame (including
cosmic time $t$), operator $T$ of energy-momentum tensor, Hamiltonian $H_t$,
and state v... | 1994-09-05 | 2007-05-23 | [
"gr-qc"
] | Vladimir S. Mashkevich |
gr-qc/9409004 | MATTERS OF GRAVITY, a newsletter for the gravity community, Number 4 | Table of contents
Editorial.
Gravity News:
Report on the APS topical group in gravitation, Beverly Berger.
Research briefs:
Gravitational microlensing and the search for dark matter, Bohdan Paczynski.
Laboratory gravity: the G mystery, Riley Newman.
LIGO project update, Stan Whitcomb.
Conference Reports... | 1994-09-02 | 2007-05-23 | [
"gr-qc"
] | Jorge Pullin (Editor) |
gr-qc/9409005 | Spacetime Information | In usual quantum theory, the information available about a quantum system is
defined in terms of the density matrix describing it on a spacelike surface.
This definition must be generalized for extensions of quantum theory which do
not have a notion of state on a spacelike surface. It must be generalized for
the genera... | 1994-09-02 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | James B. Hartle |
gr-qc/9409003 | Nonlinearity in Quantum Theory and Closed Timelike Curves | We examine consequences of the density matrix approach to quantum theory in
the context of a model spacetime containing closed timelike curves and find
that in general, an initially pure state will evolve in a nonlinear way to a
mixed quantum state. CPT invariance and the implications of this nonlinearity
for the stati... | 1994-09-02 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | M.J.Cassidy |
gr-qc/9409001 | Dust as a Standard of Space and Time in Canonical Quantum Gravity | The coupling of the metric to an incoherent dust introduces into spacetime a
privileged dynamical reference frame and time foliation. The comoving
coordinates of the dust particles and the proper time along the dust worldlines
become canonical coordinates in the phase space of the system. The Hamiltonian
constraint can... | 1994-09-01 | 2009-07-09 | [
"gr-qc"
] | J.D. Brown and K.V. Kuchar |
gr-qc/9409002 | Qualitative Analysis of Brans-Dicke Universes with a Cosmological
Constant | Solutions to flat space Friedmann-Robertson-Walker cosmologies in Brans-Dicke
theory with a cosmological constant are investigated. The matter is modelled as
a $\gamma$-law perfect fluid. The field equations are reduced from fourth order
to second order through a change of variables, and the resulting
two-dimensional s... | 1994-09-01 | 2009-10-22 | [
"gr-qc"
] | Shawn J. Kolitch |
gr-qc/9408044 | A Schrodinger Equation for Quantum Universes | We discuss how to fix the gauge in the canonical treatment of Lagrangians,
with finite number of degrees of freedom, endowed with time reparametrization
invariance. The motion can then be described by an effective Hamiltonian acting
on the gauge shell canonical space. The system is then suited for quantization.
We appl... | 1994-09-01 | 2009-10-22 | [
"gr-qc"
] | Marco Cavaglia, Vittorio de Alfaro and Alexandre T. Filippov |
gr-qc/9408038 | Characterisation of orthogonal perfect fluid cosmological spacetimes | We consider the general orthogonal metric separable in space and time
variables in comoving coordinates. We then characterise perfect fluid models
admitted by such a metric. It turns out that the homogeneous models can only be
either FLRW or Bianchi I while the inhomogeneous ones can only admit $G_2 $
(two mutually as ... | 1994-08-31 | 2007-05-23 | [
"gr-qc"
] | Naresh Dadhich, L.K. Patel, K.S. Govinder and P.G.L. Leach |
gr-qc/9408043 | Quasi-Normal Mode Expansion for Linearized Waves in Gravitational
Systems | The quasinormal modes (QNM's) of gravitational systems modeled by the
Klein-Gordon equation with effective potentials are studied in analogy to the
QNM's of optical cavities. Conditions are given for the QNM's to form a
complete set, i.e., for the Green's function to be expressible as a sum over
QNM's, answering a conj... | 1994-08-31 | 2016-08-31 | [
"gr-qc"
] | E.S.C. Ching, P.T. Leung, W.M. Suen and K. Young |
gr-qc/9408041 | The Head-On Collision of Two Equal Mass Black Holes Peter Anninos | We study the head-on collision of two equal mass, nonrotating black holes.
Various initial configurations are investigated, including holes which are
initially surrounded by a common apparent horizon to holes that are separated
by about $20M$, where $M$ is the mass of a single black hole. We have extracted
both $\ell =... | 1994-08-31 | 2009-10-22 | [
"gr-qc"
] | David Hobill, Edward Seidel, Larry Smarr and Wai-Mo Suen |
gr-qc/9408042 | The Head-On Collision of Two Equal Mass Black Holes: Numerical Methods | The head-on collision of two nonrotating axisymmetric equal mass black holes
is treated numerically. We take as initial data the single parameter family of
time-symmetric solutions discovered by Misner which consists of two
Einstein-Rosen bridges that can be placed arbitrarily distant from one another.
A number of prob... | 1994-08-31 | 2016-08-31 | [
"gr-qc"
] | Peter Anninos, David Hobill, Edward Seidel, Larry Smarr and Wai-Mo
Suen |
gr-qc/9408037 | Response of finite-time particle detectors in non-inertial frames and
curved spacetime | The response of the Unruh-DeWitt type monopole detectors which were coupled
to the quantum field only for a finite proper time interval is studied for
inertial and accelerated trajectories, in the Minkowski vacuum in (3+1)
dimensions. Such a detector will respond even while on an inertial trajctory
due to the transient... | 1994-08-31 | 2009-10-22 | [
"gr-qc"
] | L.Sriramkumar and T.Padmanabhan |
gr-qc/9408039 | On the remote sensing of Hawking grey pulses | This is a short note on the black hole remote-sensing problem, i.e., finding
out `surface' temperature distributions of various types of small
(micron-sized) black holes from the spectral measurements of their Hawking grey
pulses. Chen's modified Moebius inverse transform is illustrated in this
context | 1994-08-31 | 2009-10-22 | [
"gr-qc",
"astro-ph"
] | H.C. Rosu |
gr-qc/9408040 | General form of thermodynamical entropy for black hole | The entropy of a black hole can be different from a quarter of the area even
at the semiclassical level. | 1994-08-31 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | A. Ghosh and P. Mitra |
gr-qc/9408036 | Calculation of gravitational wave forms from black hole collisions and
disk collapse: Applying perturbation theory to numerical spacetimes | Many simulations of gravitational collapse to black holes become inaccurate
before the total emitted gravitational radiation can be determined. The main
difficulty is that a significant component of the radiation is still in the
near-zone, strong field region at the time the simulation breaks down. We show
how to calcu... | 1994-08-30 | 2009-10-22 | [
"gr-qc"
] | Andrew M. Abrahams, Stuart L. Shapiro, and Saul A. Teukolsky |
gr-qc/9408035 | Exact solutions of Einstein and Einstein-scalar equations in 2 + 1
dimensions | A nonstatic and circularly symmetric exact solution of the Einstein equations
(with a cosmological constant $\Lambda$ and null fluid) in $2+1$ dimensions is
given. This is a nonstatic generalization of the uncharged spinless BTZ metric.
For $\Lambda = 0 $, the spacetime is though not flat, the Kretschmann invariant
van... | 1994-08-29 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | K. S. Virbhadra |
gr-qc/9408034 | A Comment on Junction and Energy Conditions in Thin Shells | This comment contains a suggestion for a slight modification of Israel's
covariant formulation of junction conditions between two spacetimes, placing
both sides on equal footing with normals having uniquely defined orientations.
The signs of mass energy densities in thin shells at the junction depend not
only on the or... | 1994-08-26 | 2010-04-06 | [
"gr-qc"
] | D. S. Goldwirth and J. Katz |
gr-qc/9408033 | Chern-Simons functional and the no-boundary proposal in Bianchi IX
quantum cosmology | The Chern-Simons functional $S_{\rm CS}$ is an exact solution to the
Ashtekar-Hamilton-Jacobi equation of general relativity with a nonzero
cosmological constant. In this paper we consider $S_{\rm CS}$ in Bianchi type
IX cosmology with $S^3$ spatial surfaces. We show that among the classical
solutions generated by~$S_{... | 1994-08-26 | 2010-11-01 | [
"gr-qc",
"hep-th"
] | Jorma Louko |
gr-qc/9408030 | Maupertuis principle, Wheeler's superspace and an invariant criterion
for local instability in general relativity | It is tempting to raise the issue of (metric) chaos in general relativity
since the Einstein equations are a set of highly nonlinear equations which may
exhibit dynamically very complicated solutions for the space-time metric.
However, in general relativity it is not easy to construct indicators of chaos
which are gaug... | 1994-08-25 | 2009-09-25 | [
"gr-qc"
] | Marek Biesiada and Svend E. Rugh |
gr-qc/9408032 | Gravitation and Cosmology in Generalized (1+1)-dimensional dilaton
gravity | The actions of the ``$R=T$'' and string-inspired theories of gravity in (1+1)
dimensions are generalized into one single action which is characterized by two
functions. We discuss differing interpretations of the matter stress-energy
tensor, and show how two such different interpretations can yield two different
sets o... | 1994-08-25 | 2010-04-06 | [
"gr-qc"
] | J.S.F. Chan and R.B. Mann |
gr-qc/9408031 | Kaluza -- Klein Quantum Cosmology with Primordial Negative Cosmological
Constant | In many interesting models, including superstring theories, a negative vacuum
energy is predicted. Although this effect is usually regarded as undesirable
from a cosmological point of view, we show that this can be the basis for a new
approach to the cosmology of the early Universe. In the framework of quantum
cosmolog... | 1994-08-25 | 2007-05-23 | [
"gr-qc"
] | E. I. Guendelman and A. B. Kaganovich |
gr-qc/9408029 | Quantum Behavior in Asymmetric, Weyl-Like Cartan Geometries | This discussion examines recent developments in the theory of a Weyl-like,
Cartan geometry with natural Schr\"odinger field behavior proposed previously.
In that model, very nearly exactly a coupled Einstein-Maxwell- Schr\"odinger,
classical field theory emerges from a gauge invariant, purely geometric action
based sol... | 1994-08-24 | 2008-02-03 | [
"gr-qc"
] | J.E. Rankin |
gr-qc/9408028 | New Algebraic Methods for Calculating the Heat Kernel and Effective
Action in Quantum Gravity and Gauge Theories | An overview about recent progress in the calculation of the heat kernel and
the one-loop effective action in quantum gravity and gauge theories is given.
We analyse the general structure of the standard Schwinger-De Witt asymptotic
expansion and discuss the applicability of that to the case of strongly curved
manifolds... | 1994-08-24 | 2007-05-23 | [
"gr-qc",
"hep-th"
] | I. G. Avramidi |
gr-qc/9408027 | What is and What should be Time? | The notions of time in the theories of Newton and Einstein are reviewed so
that certain of their assumptions are clarified. These assumptions will be seen
as the causes of the incompatibility between the two different ways of
understanding time, and seen to be philosophical hypotheses, rather than purely
scientific one... | 1994-08-20 | 2008-02-03 | [
"gr-qc"
] | Hitoshi Kitada and Lancelot R. Fletcher |
gr-qc/9408024 | Quantum cosmology and the value of $\Lambda$ | We analyse a simple model with just a $\Lambda$ term present. Differing
results are obtained depending on the boundary conditions applied. HH boundary
conditions give the factor exp(1/Lambda) but in agreement with Rubakov et al.
is badly behaved for negative lambda. Tunneling boundary conditions suggests a
large initia... | 1994-08-19 | 2009-10-22 | [
"gr-qc"
] | D.H. Coule |
gr-qc/9408026 | Canonical measure and the flatness of a FRW universe | We consider the claim of Hawking and Page that the canonical measure applied
to a FRW universe with a massive scalar field can solve the flatness problem
regardless of inflation. By considering a general potential we are able to
understand how the ambiguity for $\Omega$ found by Page in the $R^2$ theory is
present when... | 1994-08-19 | 2010-04-06 | [
"gr-qc"
] | D.H. Coule |
gr-qc/9408025 | Inflationary cosmology with a non-analytic Lagrangian | We consider an alternative higher order gravity theory which is non-analytic
in the Ricci curvature. It has power-law inflationary behaviour. This is
further evidence that inflation is a general property of higher derivative
gravity theories. | 1994-08-19 | 2015-06-25 | [
"gr-qc"
] | E. Bruning, D. Coule and C. Xu |
gr-qc/9408021 | Quantum State of Wormholes and Topological Arrow of Time | This paper studies the time-symmetry problem in quantum gravity. The issue
depends critically on the choice of the quantum state and has been considered
in this paper by restricting to the case of quantum wormholes. It is seen that
pure states represented by a wave functional are time symmetric. However, a
maximal anal... | 1994-08-18 | 2014-11-17 | [
"gr-qc"
] | Pedro F. Gonzalez-Diaz |
gr-qc/9408023 | The Theory of Everything vs the Theory of Anything | To what extent can our limited set of observations be used to pin down the
specifics of a ``Theory of Everything''? In the limit where the links are
arbitrarily tenuous, a ``Theory of Everything'' might become a ``Theory of
Anything''. A clear understanding of what we can and can not expect to learn
about the universe ... | 1994-08-18 | 2018-05-02 | [
"gr-qc",
"astro-ph",
"hep-th"
] | Andreas Albrecht |
gr-qc/9408022 | Wormholes and Cosmic Strings | A gravitational scenario is proposed where the euclidean action is invariant
under the isotropic and homogeneous version of the euclidean {\it U(1)} group
of local transformations of the scale factor and scalar matter field,
interpreting the the trace of the second fundamental form as the gauge field.
The model allows ... | 1994-08-18 | 2007-05-23 | [
"gr-qc"
] | Pedro F. Gonzalez-Diaz |
gr-qc/9408020 | On the stability of black hole event horizons | In this work we study a {\it gedanken} experiment constructed in order to
test the cosmic censorship hypothesis and the second law of black hole
thermo-dynamics. Matter with a negative gravitating energy is imagined added to
a near extremal $U(1)$-charged static black hole in Einstein-Maxwell theory.
The dynamics of a ... | 1994-08-17 | 2009-10-22 | [
"gr-qc"
] | Bjorn Jensen |
gr-qc/9408019 | Spontaneous excitation of an accelerated atom: The contributions of
vacuum fluctuations and radiation reaction | We consider an atom in interaction with a massless scalar quantum field. We
discuss the structure of the rate of variation of the atomic energy for an
arbitrary stationary motion of the atom through the quantum vacuum. Our main
intention is to identify and to analyze quantitatively the distinct
contributions of vacuum ... | 1994-08-16 | 2009-10-22 | [
"gr-qc",
"hep-th"
] | Juergen Audretsch and Rainer Mueller |
gr-qc/9408018 | Spherically Symmetric Event Horizons and Trapped Surfaces Developing
{}from Innociuous Data | In this paper we show the existence of a large class of spherically symmetric
data $d$ (on a spacelike hypersurface $S$), from which a perfect fluid
spacetime (surrounded by vacuum) develops. This spacetime contains an event
horizon (with trapped surfaces behind it). The data $d$ are regular and {\it
innociuous}, i.e. ... | 1994-08-15 | 2010-05-12 | [
"gr-qc"
] | Ulrich Alfes and Henning M\"uller zum Hagen |
gr-qc/9408017 | Relevance of Induced Gauge Interactions in Decoherence | Decoherence in quantum cosmology is shown to occur naturally in the presence
of induced geometric gauge interactions associated with particle production.A
new 'gauge '-variant form of the semiclassical Einstein equations is also
presented which makes the non-gravitating character of the vacuum polarisation
energy expli... | 1994-08-15 | 2011-08-04 | [
"gr-qc"
] | Dhurjati Prasad Datta |
gr-qc/9408016 | Fluctuations of the Unruh Temperature | Using the influence functional formalism, the problem of an accelerating
detector in the presence of a scalar field in its ground state is considered in
Minkowski space. As is known since the work of Unruh, to a quantum mechanical
detector following a definite, classical acceleration, the field appears to be
thermally ... | 1994-08-11 | 2011-08-04 | [
"gr-qc",
"hep-th"
] | J.-G. Demers |
gr-qc/9408015 | Observables for Two-Dimensional Black Holes | We consider the most general dilaton gravity theory in 1+1 dimensions. By
suitably parametrizing the metric and scalar field we find a simple expression
that relates the energy of a generic solution to the magnitude of the
corresponding Killing vector. In theories that admit black hole solutions, this
relationship lead... | 1994-08-11 | 2016-08-24 | [
"gr-qc"
] | J. Gegenberg, G. Kunstatter and D. Louis-Martinez |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.