Shortcuts in cosmological branes

Details Shortcuts in cosmological branes Shortcuts in cosmological branes

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nuphs.127....1a&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 127, p. 1-7.

Physics

Nuclear Physics

Scientific paper

We consider a dynamical membrane world in a space-time with scalar bulk matter described by domain walls, as well as a dynamical membrane world in empty Anti de Sitter space-time. Using the solutions to Einstein equations and boundary conditions we investigate the possibility of having shortcuts for gravitons leaving the membrane and returning subsequently. In comparison with photons following a geodesic inside the brane we verify that shortcuts exist. For some Universes they are small, but sometimes are quite effective. In the case of matter branes, we argue that at times just before nucleosynthesis the effect is sufficiently large to provide corrections to the inflationary scenario, especially as concerning the horizon problem.
This work has been supported by Fundca~o de Amparo à Pesquisa do Estado de Sa~o Paulo (FAPESP) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil.

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