5,252 research outputs found
A Relation Between Gravity in --Dimensions and Pontrjagin Topological Invariant
A relation between the MacDowell-Mansouri theory of gravity and the
Pontrjagin toplogical invariant in dimensions is discussed. This
relation may be of especial interest in the quest of finding a mechanism to go
from non-dynamical to dynamical gravity.Comment: 9 pages, Te
Information Loss in Black Holes
The question of whether information is lost in black holes is investigated
using Euclidean path integrals. The formation and evaporation of black holes is
regarded as a scattering problem with all measurements being made at infinity.
This seems to be well formulated only in asymptotically AdS spacetimes. The
path integral over metrics with trivial topology is unitary and information
preserving. On the other hand, the path integral over metrics with non-trivial
topologies leads to correlation functions that decay to zero. Thus at late
times only the unitary information preserving path integrals over trivial
topologies will contribute. Elementary quantum gravity interactions do not lose
information or quantum coherence
Study of Bose-Einstein Correlations in e+e- -> W+W- events at LEP
Bose-Einstein correlation between like-sign charged-particle pairs in e+e- ->
W+W- events recorded with the OPAL detector at LEP at centre-of-mass energies
between 183 GeV and 209 GeV are studied. Recently proposed methods which allow
direct searches for correlations in the data via distributions of test
variables are used to investigate the presence of correlations between hadrons
originating from different W bosons in W+W- -> qqqq events. Within the
statistics of the data sample no evidence for inter-WW Bose-Einstein
correlations is obtained. The data are also compared with predictions of a
recent implementation of Bose-Einstein correlation effects in the Monte Carlo
model PYTHIA.Comment: 29 pages, 10 figures, Submitted to Eur. Phys. J.
Existence of Majorana fermions for M-branes wrapped in space and time
We show that it is possible to define Majorana (s)pinor fields on M-branes
which have been identified under the action of the antipodal map on the adS
factor of the throat geometry, or which have been wrapped on two-cycles of
arbitrary genus. This is an important consistency check, since it means that
one may still take the generators of supertranslations in superspace to
transform as Majorana fermions under the adjoint action of , even
though the antipodally identified M2-brane is {\it not} space-orientable. We
point out that similar conclusions hold for any p-branes which have the generic
(adS)(Sphere) throat geometry.Comment: 10 pages REVTe
An Introduction To The Web-Based Formalism
This paper summarizes our rather lengthy paper, "Algebra of the Infrared:
String Field Theoretic Structures in Massive Field Theory In
Two Dimensions," and is meant to be an informal, yet detailed, introduction and
summary of that larger work.Comment: 50 pages, 40 figure
Thick Domain Walls in AdS Black Hole Spacetimes
Equations of motion for a real self-gravitating scalar field in the
background of a black hole with negative cosmological constant were solved
numerically. We obtain a sequence of static axisymmetric solutions representing
thick domain wall cosmological black hole systems, depending on the mass of
black hole, cosmological parameter and the parameter binding black hole mass
with the width of the domain wall. For the case of extremal cosmological black
hole the expulsion of scalar field from the black hole strongly depends on it.Comment: 20 pages, 19 figures, accepted for publication in Phys. Rev.
Chiral Rings, Vacua and Gaugino Condensation of Supersymmetric Gauge Theories
We find the complete chiral ring relations of the supersymmetric U(N) gauge
theories with matter in adjoint representation. We demonstrate exact
correspondence between the solutions of the chiral ring and the supersymmetric
vacua of the gauge theory. The chiral ring determines the expectation values of
chiral operators and the low energy gauge group. All the vacua have nonzero
gaugino condensation. We study the chiral ring relations obeyed by the gaugino
condensate. These relations are generalizations of the formula
of the pure gauge theory.Comment: 38 page
Anomalies, Gauss laws, and Page charges in M-theory
We review the E(8) model of the M-theory 3-form and its applications to
anomaly cancellation, Gauss laws, quantization of Page charge, and the 5-brane
partition function. We discuss the potentially problematic behavior of the
model under parity.Comment: 14 pp., Talk presented at Strings 2004, Paris, July
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