527 research outputs found
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
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
Dynamics of partially localized brane systems
We study dynamical partially localized brane solutions in higher dimensions.
We give new descriptions of the relevant solutions of dynamical branes which
are localized along both the overall and relative transverse directions. The
starting point is a system of p_r-branes ending on a p_s-brane with a
time-dependent warp factor. This system can be related to Dp_r-Dp_s brane
system in string theory, where one brane is localized at the delocalized other
brane. We then show that these give Friedmann-Lemaitre-Robertson-Walker
cosmological solutions. Our approach leads to a new and manifest description of
the brane configurations near the delocalized branes, and new solutions in the
wave or KK-monopole background in terms of certain partial differential
equations in D dimensions including ten and eleven dimensions.Comment: 61 pages; v3: minor correction
Quantum Description for the Decay of NSNS Brane-Antibrane Systems
The stringy description for the instabilities in the charged
pairs is now well understood in terms of the open string
tachyon condensation. The quantum interpretation presumably via the stringy
description for the instabilities in the -charged and
pairs in IIA/IIB theories, however, has not been established
yet. This would be partly because of the absence (for the case)
or our relatively poor understanding (for the case) of their
worldvolume (gauge theory) dynamics. In the present work, using the well-known
quantum description for instabilities in the -charged
systems and in the M-theory brane-antibrane systems and invoking appropriate
string dualities, the stringy nature of the instabilities in the -charged
and systems has been uncovered. For the
annihilations to string vacua, the quantum, stringy interpretations are simple
extensions of Sen's conjecture for those in -charged brane-antibrane
systems.Comment: 22 pages, 4 eps figures, Latex, comments and references adde
Bulk Fields in Delocalized Dilatonic p-Branes
We study localization properties of various bulk fields on a dilatonic
p-brane which is delocalized along its transverse directions except one. We
find that all the bosonic and fermionic bulk fields can be localized on the
delocalized dilatonic p-brane in a strict sense, namely the Kaluza-Klein zero
modes of the bulk fields are normalizable and are localized around the brane,
for any values of the dilaton coupling parameter.Comment: 9 pages, LaTe
A Note on Solitons in Brane Worlds
We obtain the zero mode effective action for gravitating objects in the bulk
of dilatonic domain walls. Without additional fields included in the bulk
action, the zero mode effective action reproduces the action in one lower
dimensions obtained through the ordinary Kaluza-Klein (KK) compactification,
only when the transverse (to the domain wall) component of the bulk metric does
not have non-trivial term depending on the domain wall worldvolume coordinates.
With additional fields included in the bulk action, non-trivial dependence of
the transverse metric component on the domain wall worldvolume coordinates
appears to be essential in reproducing the lower-dimensional action obtained
via the ordinary KK compactification. We find, in particular, that the
effective action for the charged (p+1)-brane in the domain wall bulk reproduces
the action for the p-brane in one lower dimensions.Comment: 13 pages, LaTe
Towards the entropy of gravity time-dependent models via the Cardy-Verlinde formula
For models with several time-dependent components generalized entropies can
be defined. This is shown for the Bianchi type IX model. We first derive the
Cardy-Verlinde formula under the assumption that the first law of
thermodynamics is valid. This leads to an explicit expression of the total
entropy associated with this type of universes. Assuming the validity of the
Cardy entropy formula, we obtain expressions for the corresponding Bekenstein,
Bekenstein-Hawking and Hubble entropies. We discuss the validity of the
Cardy-Verlinde formula and possible extensions of the outlined procedure to
other time-dependent models.Comment: 13 page
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