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arxiv: hep-th/9610172 · v4 · submitted 1996-10-22 · ✦ hep-th · gr-qc

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

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classification ✦ hep-th gr-qc
keywords d-branescalarsabsorptionfixedblackcross-sectioneffectiveholes
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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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