212 research outputs found
On "the'' electric field of a uniformly accelerating charge
The problem of the electric field of a uniformly accelerating charge is a
longstanding one that has led to several issues. We resolve these issues using
techniques from linguistics, cognitive psychology, and the mathematics of
partial differential equations
Black hole entropy as a consequence of excision
Black hole entropy is shown to be a consequence of restricting our
description of physics to the exterior of black holes. This precludes the need
for a statistical mechanical description of this entropy in terms of
microstates
Matters of Gravity, The Newsletter of the Topical Group in Gravitation of the American Physical Society, Volume 28, Fall 2006
Research Briefs:
Singularity Avoidance in Canonical Quantum Gravity, by Viqar Husain
What's New in LIGO, by David Shoemaker
Conference reports:
Scanning New Horizons: GR Beyond 4 dimensions, by Donald Marolf
Quantum Gravity in the Americas III, by Jorge Pullin
New Frontiers in Numerical Relativity, by Luciano Rezzolla
Teaching General Relativity to Undergraduates, by Greg Comer
Ninth Capra Meeting on Radiation Reaction, by Lior BurkoComment: 20 pages. David Garfinkle (Editor
Inhomogeneous spacetimes as a dark energy model
Tolman-Bondi inhomogeneous spacetimes are used as a cosmological model for
type Ia supernova data. It is found that with certain parameter choices the
model fits the data as well as the standard CDM cosmology does.Comment: 9 pages, 6 figures, Added Reference
Matters of Gravity, The Newsletter of the Division of Gravitational Physics of the American Physical Society, Volume 50, December 2017
DGRAV News:
We hear that ....
APS April Meeting
Town Hall Meeting
Conference Reports:
Hawking Conference
Benasque workshop 2017
QIQG 3
Obituary:
Remembering Cecile De Witt-Morett
How extreme are extreme black holes?
We examine the properties of nearly extremal black holes produced by
gravitational collapse. It is shown that an observer who crosses the black hole
horizon at late times rapidly encounters a singularity.Comment: 10 pages, 3 figure
Matters of Gravity, The Newsletter of the Topical Group on Gravitation of the American Physical Society, Volume 35, Winter 2010
GGR News:
- GGR Program at the APS meeting in Washington D.C., by David Garfinkle
- we hear that..., by David Garfinkle
Research Briefs:
- Supernovae modelling, by Ian Hawke
Conference Reports:
- ADM-50, by Richard WoodardComment: 11 pages, late
Matters of Gravity, The Newsletter of the Division of Gravitational Physics of the American Physical Society, Volume 47, June 2016
DGRAV News:
DGRAV
we hear that....
Research Briefs:
GW150914
Obituaries:
Remembering Felix Pirani
Remembering David Finkelstein
Steve, the physicist
Remembering Sergio Dain
Editorial:
Gravitational physics in the modern universit
The fine structure of Gowdy spacetimes
The approach to the singularity in Gowdy spacetimes consists of velocity term
dominated behavior, except at a set of isolated points. At and near these
points, spiky features grow. This paper reviews what is known about these
spikes.Comment: contribution to A Spacetime Safari: Essays in honor of Vincent
Moncrie
The motion of galaxy clusters in inhomogeneous cosmologies
Lemaitre-Tolman-Bondi inhomogeneous spacetimes can be used as a cosmological
model to account for the type Ia supernova data. However, such models also give
rise to large velocities of galaxy clusters with respect to the cosmic
microwave background. Those velocities can be measured using the kinematic
Sunyaev-Zeldovich effect. This paper presents a calculation of galaxy cluster
velocities as a function of redshift for such a model.Comment: 7 pages, 2 figure
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