2,171 research outputs found
The Cardy-Verlinde Formula and Asymptotically Flat Charged Black Holes
We show that the modified Cardy-Verlinde formula without the Casimir effect
term is satisfied by asymptotically flat charged black holes in arbitrary
dimensions. Thermodynamic quantities of the charged black holes are shown to
satisfy the energy-temperature relation of a two-dimensional CFT, which
supports the claim in our previous work (Phys. Rev. D61, 044013,
hep-th/9910244) that thermodynamics of charged black holes in higher dimensions
can be effectively described by two-dimensional theories. We also check the
Cardy formula for the two-dimensional black hole compactified from a dilatonic
charged black hole in higher dimensions.Comment: 6 pages, LaTeX, references adde
Localization of Bulk Form Fields on Dilatonic Domain Walls
We study the localization properties of bulk form potentials on dilatonic
domain walls. We find that bulk form potentials of any ranks can be localized
as form potentials of the same ranks or one lower ranks, for any values of the
dilaton coupling parameter. For large enough values of the dilaton coupling
parameter, bulk form potentials of any ranks can be localized as form
potentials of both the same ranks and one lower ranks.Comment: 9 pages, LaTeX, reference adde
(Generalized) Conformal Quantum Mechanics of 0-Branes and Two-Dimensional Dilaton Gravity
We study the relation between the (generalized) conformal quantum mechanics
of 0-branes and the two-dimensional dilaton gravity. The two-dimensional
actions obtained from the supergravity effective actions for the (dilatonic)
0-branes through the compactification on a sphere are related to known
two-dimensional dilaton gravity models. The SL(2,R) symmetry of the
(generalized) conformal quantum mechanics is realized within such
two-dimensional models. The two-dimensional dilatonic gravity model derived
from the non-dilatonic 0-brane action is related to the Liouville theory and
therefore is conformal, whereas the two-dimensional model derived from the
dilatonic 0-brane action does not have the conformal symmetry.Comment: 21 pages, LaTeX, version to appear in Nucl. Phys. B, an error in Eq.
(49) correcte
BPS Saturated and Non-Extreme States in Abelian Kaluza-Klein Theory and Effective N=4 Supersymmetric String Vacua
We summarize results for all four-dimensional Bogomol'nyi-Sommerfield-Prasat
(BPS) saturated and non-extreme solutions of the ()-dimensional Abelian
Kaluza-Klein theory. Within effective N=4 supersymmetric string vacua,
parameterized in terms of fields of the heterotic string on a six-torus, we
then present a class of BPS saturated states and the corresponding non-extreme
solutions, specified by and orbits of general dyonic
charge configurations with zero axion. The BPS saturated states with
non-negative norms for electric and magnetic charge vectors, along
with the corresponding set of non-extreme solutions, are regular with non-zero
masses. BPS saturated states with the negative charge norms are singular,
unaccompanied by non-extreme solutions and become massless at particular points
of the moduli space. The role that such massless states may play in the
enhancement of non-Abelian gauge symmetry as well as local supersymmetry is
addressed.Comment: 18 pages, uses RevTex, contribution to the Proceedings of String'95
conferenc
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