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Comments on Supergravity Description of S-branes

arXiv:hep-th/0305055 · doi:10.1088/1126-6708/2003/05/069

Abstract

This is a note on the coupled supergravity-tachyon matter system, which has been earlier proposed as a candidate for the effective space-time description of S-branes. In particular, we study an ansatz with the maximal ISO(p+1)xSO(8-p,1) symmetry, for general brane dimensionality p and homogeneous brane distribution in transverse space ρ_\perp. A simple application of singularity theorems shows that (for p \le 7) the most general solution with these symmetries is always singular. (This invalidates a recent claim in the literature.) We include a few general comments about the possibility of describing the decay of unstable D-branes in purely gravitational terms.

19 pages, refs added

Comments on Supergravity Description of S-branes · wovepaper