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arXiv · hep-th/9610172

Absorption of Fixed scalars and the D-brane Approach to Black Holes

C. G. Callan·S. S. Gubser·I. R. Klebanov·A. A. Tseytlin
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Abstract

We calculate the emission and absorption rates of fixed scalars by the near-extremal five-dimensional black holes that have recently been modeled using intersecting D-branes. We find agreement between the semi-classical and D-brane computations. At low energies the fixed scalar absorption cross-section is smaller than for ordinary scalars and depends on other properties of the black hole than just the horizon area. In the D-brane description, fixed scalar absorption is suppressed because these scalars must split into at least four, rather than two, open strings running along the D-brane. Consequently, this comparison provides a more sensitive test of the effective string picture of the D-brane bound state than does the cross-section for ordinary scalars. In particular, it allows us to read off the value of the effective string tension. That value is precisely what is needed to reproduce the near-extremal 5-brane entropy.

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C. G. Callan, S. S. Gubser, I. R. Klebanov, A. A. Tseytlin. 1996-12-26. Absorption of Fixed scalars and the D-brane Approach to Black Holes. https://doi.org/10.1016/s0550-3213(97)00013-8

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