369 research outputs found
Thermodynamics of Black Hole in (N+3)-dimensions from Euclidean N-brane Theory
In this article we consider an N-brane description of an (N+3)-dimensional
black hole horizon. First of all, we start by reviewing a previous work where a
string theory is used as describing the dynamics of the event horizon of a four
dimensional black hole. Then we consider a particle model defined on one
dimensional Euclidean line in a three dimensional black hole as a target
spacetime metric. By solving the field equations we find a ``world line
instanton'' which connects the past event horizon with the future one. This
solution gives us the exact value of the Hawking temperature and to leading
order the Bekenstein-Hawking formula of black hole entropy. We also show that
this formalism is extensible to an arbitrary spacetime dimension. Finally we
make a comment of one-loop quantum correction to the black hole entropy
Localization of Gravitino on a Brane
We show how the spin 3/2 gravitino field can be localized on a brane in a
general framework of supergravity theory. Provided that a scalar field coupled
to the Rarita-Schwinger field develops an vacuum expectation value (VEV) whose
phase depends on the 'radial' coordinate in extra internal space, the gravitino
is localized on a brane with the exponentially decreasing warp factor by
selecting an appropriate value of the VEV.Comment: 7 pages, LaTex 2e, no figure
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