1,872 research outputs found
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
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
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
The Probability for matter-Antimatter Segregation Following the Quark-Hadron Transition
Cosmologists such Sakharov, Alfv\'en, Klein, Weizs\"acker, Gamow and Harrison
all disregarded the distribution of baryons and antibaryons immediately prior
to freeze-out in trying to elucidate the circumstances that explained hadron
distribution in the early universe. They simply accepted a uniform
distribution: each baryon paired with an antibaryon. Their acceptance of this
assumption resulted in theoretical difficulties that could not be overcome.
This essay discards this assumption of homogeneity or uniformity. Although this
essay does deal with early-universe matters, it is not meant to indicate any
involvement in energy distribution functions nor in any symmetry-asymmetry
controversies. Cluster formation is strictly geometric. This essay has value as
far as problems early cosmologists faced but also should complete the historic
record
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
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
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
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