Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-10-22
Nucl.Phys.B489:65-94,1997
Physics
High Energy Physics
High Energy Physics - Theory
33 pages, harvmac, version to appear in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(97)00013-8
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.
Callan Curtis G.
Gubser Steven S.
Klebanov Igor R.
Tseytlin Arkady A.
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