Emission from parallel p-brane Black Holes

TL;DR

This paper studies the emission and absorption processes of massless scalars by near-extremal parallel D-brane black holes, revealing limitations in the universality of the cross-section for certain brane configurations.

Contribution

It analyzes the scalar emission/absorption cross-section in D-brane black holes, highlighting cases where the expected universal behavior does not hold.

Findings

Cross-section matches universal low-energy black hole predictions only for 1-branes and 3-branes.

For other brane configurations, the cross-section generally fails to reproduce the universal behavior.

The results depend on assumptions about the interactions between scalars and open string states.

Abstract

The entropy of a near-extremal black hole made of parallel D-branes has been shown to agree, upto a numerical factor, with that of the gas of massless open string states on the brane worldvolume when the string coupling is chosen suitably. We investigate the process of emission or absorption of massless S-wave neutral scalars by these black holes. We show that with rather mild assumptions about the nature of the interactions between the scalar and open string states, the D-brane cross-section generally fails to reproduce the universal low energy black hole cross-section except for 1-branes and 3-branes.