Graviton Absorption by Non-BPS Branes
arXiv:hep-th/0101077 · doi:10.1016/S0370-2693(01)00205-2
Abstract
We consider the behaviour of neutral non-BPS branes probed by scalars and gravitons. We show that the naked singularity of the non-BPS branes is a {\it repulson} absorbing no incoming radiation. The naked singularity is surrounded by an infinite potential well breaking the unitarity of the scattering S-matrix. We compute the absorption cross section which is infrared divergent. In particular this confirms that gravity does not decouple for the non-BPS branes.
13 pages, Latex