9,904 research outputs found
Fermion Emission from Five-Dimensional Black Holes
We calculate semiclassically the emission rate of spin 1/2 particles from
charged, nonrotating black holes in D=5,N=8 supergravity. The relevant Dirac
equation is solved by the same approximation as in the bosonic case. The
resulting expression for the emission rate has a form which is predicted from
D-brane effective field theory.Comment: 28 pages, Latex; 1 reference adde
Gravity, particle physics and their unification
We explain the need for a theory of quantum gravity and some general ideas
about string theory, including the idea of the derivation of the Hawking
Bekenstein entropy formula for extremal black holes. We then give a general
description of the correspondence between the large N limit of certain gauge
theories and string theory on spacetimes with boundaries.Comment: latex, 8 figures. Talk at Lepton-Photon 99. Talk for
non-string-theorist
D-brane Description of New Open String Solutions in AdS(5)
In this paper we find D-brane descriptions of some of new open string
solutions that were found in 0804.3438[hep-th]. These D5-brane and D3-brane
configurations give gravitational dual descriptions of Wilson loops in some
particular representations.Comment: 13 pages, references adde
A Note on the String Dual of N=1 SQCD-like Theories
In this note we describe how N=1 SQCD-like theories with a large number of
flavors can be given a dual description in terms of a string background
containing a large number of additional D5-branes. The dual geometries account
for the backreaction of the additional branes: they depend on the ratio between
the number of flavors and colors of the gauge theory.
This note is based on hep-th/0602027. We present here also a new set of
solutions, which are not included in the original paper.Comment: 10 pages, 2 figures. Contribution to the proceedings of the RTN
project "Constituents, Fundamental Forces and Symmetries of the Universe"
conference in Naples, October 9 - 13, 200
The slowly rotating near extremal D1-D5 system as a `hot tube'
The geometry of the D1-D5 system with a small angular momentum j has a long
throat ending in a conical defect. We solve the scalar wave equation for low
energy quanta in this geometry. The quantum is found to reflect off the end of
the throat, and stay trapped in the throat for a long time. The length of the
throat for j=1/2 equals n_1n_5 R, the length of the effective string in the
CFT; we also find that at this distance the incident wave becomes nonlinear.
Filling the throat with several quanta gives a `hot tube' which has emission
properties similar to those of the near extremal black hole.Comment: 31 pages, Latex, typo corrected, reference adde
- âŠ