99 research outputs found
Inflating Brane inside hyper-spherically symmetric defects
Static and inflating brane world models are considered in -dimensions
with a non zero bulk cosmological constant and with a hyper-spherically
symmetric topological defect residing in the extra dimensions. Several
vacuum solutions can be constructed explicitely when the bulk and inflating
constants are non zero. We study how these solutions are deformed by the
presence of a global monopole for generic values of and a local monopole
for . New types of solutions, regular and periodic in the radial variable
relative to the extra dimensions, are constructed.Comment: 23 pages, 9 figures, results extended, references adde
Non Uniform Black Strings and Critical Dimensions in
We study the equations of black strings in spacetimes of arbitrary dimensions
with a negative cosmological constant and construct numerically non uniform
black strings solutions. Our results suggest the existence of a localised black
hole in asymptotically locally spacetime. We also present evidences for a
dependence of the critical dimension on the horizon radius.The critical
dimension represents the dimension where the order of the phase transition
between uniform and non uniform black string changes. Finally, we argue that
both, the regular asymptotically locally solution and black string
solutions with a very small horizon radius, present a negative tension. This
turns out to be an unexpected feature of the solutions.Comment: 13 pages, 5 figure
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