TL;DR
This paper investigates how non-BPS branes interact with scalars and gravitons, revealing a repulsive naked singularity that absorbs radiation and leads to non-decoupling of gravity, with implications for scattering and absorption properties.
Contribution
It demonstrates that non-BPS branes have a repulson singularity with an infinite potential well, affecting scattering unitarity and showing gravity does not decouple.
Findings
Naked singularity acts as a repulson absorbing radiation.
Absorption cross section is infrared divergent.
Gravity remains coupled to non-BPS branes.
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.
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