706 research outputs found
BPS domain walls from backreacted orientifolds
Compactifications with D-brane and orientifold sources lead to standard
gauged supergravity theories if the sources are smeared over the internal
directions. It is therefore of interest to find how the solutions described by
the gauged supergravity are altered by properly localising the sources. In this
paper we analyse this for BPS domain wall solutions in the seven-dimensional
gauged supergravity obtained from an O6 toroidal orientifold compactification
in massive IIA supergravity. This is one of the simplest no-scale
supergravities that can be constructed and analysed in full detail. We find and
discuss the BPS domain walls both when the O6 planes are smeared and localised.
When the O6 planes are localised the domain wall solutions live in a warped
compactification. In order to get explicit expressions we also consider the
non-compact versions of the solutions for which the O6 planes have been traded
for D6 branes. Through T-duality we obtain partially localised solutions for
compactifications to four dimensions using O3 planes with 3-form fluxes.Comment: 23 pages, 1 figur
Dilatonic Randall-Sundrum Theory and renormalisation group
We extend Randall-Sundrum dynamics to non-conformal metrics corresponding to
non-constant dilaton. We study the appareance of space-time naked singularities
and the renormalization group evolution of four-dimensional Newton constant.Comment: 11 pages, 3 figures, reference added, typos correcte
Brane World with Bulk Horizons
A brane world in the presence of a bulk black hole is constructed. The brane
tension is fine tuned in terms of the black hole mass and cosmological
constant. Gravitational perturbations localized on the brane world are
discussed.Comment: 7 pages, 2 figures. Typos corrected and new references adde
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