Cosmological Instabilities from Vector Perturbations in Braneworlds

Details Cosmological Instabilities from Vector Perturbations in Braneworlds Cosmological Instabilities from Vector Perturbations in Braneworlds

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet..186d&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

Vector perturbations induced on the brane by gravitational waves propagating in the bulk are studied in a cosmological framework. Cosmic expansion arises from the brane motion in a non-compact Z2 symmetric five-dimensional anti-de Sitter space-time. By solving the vector perturbation equations in the bulk, for generic initial conditions, we find that they give rise to growing modes on the brane in the Friedmann-Lemaître era. Among these modes, we exhibit a class of normalizable perturbations, which are exponentially growing with respect to conformal time on the brane. The presence of these modes is strongly constrained by the homogeneity and isotropy of the observable Universe.

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