On Tachyon kinks from the DBI action

Abstract

We consider solitonic solutions of the DBI tachyon effective action for a non-BPS brane in the presence of an electric field. We find that for a constant electric field $\tilde{E}\le 1$, regular solitons compactified on a circle admit a singular and decompactified limit corresponding to Sen's proposal provided the tachyon potential satisfies some restrictions. On the other hand for the critical electric field $\tilde{E}=1$, regular and finite energy solitons are constructed without any restriction on the potential.

proceedings of the second string phenomenology conference, Durham, 30th July to 4th August 2003