Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-02-13
Phys.Rev. D58 (1998) 124025
Physics
High Energy Physics
High Energy Physics - Theory
30 pages, harvmac; Clarification is added on the size of disagreement claimed; Remarks are added on treating the limit in whic
Scientific paper
10.1103/PhysRevD.58.124025
An expression for the spacetime absorption coefficient of a scalar field in a five dimensional, near extremal black hole background is derived, which has the same form as that presented by Maldacena and Strominger, but is valid over a larger, U-duality invariant region of parameter space and in general disagrees with the corresponding D-brane result. We develop an argument, based on D-brane thermodynamics, which specifies the range of parameters over which agreement should be expected. For neutral emission, the spacetime and D-brane results agree over this range. However, for charged emission, we find disagreement in the `Fat Black Hole' regime, in which charge is quantized in smaller units on the brane, than in the bulk of spacetime. We indicate a possible problem with the D-brane model in this regime. We also use the Born approximation to study the high frequency limit of the absorption coefficient and find that it approaches unity, for large black hole backgrounds, at frequencies still below the string scale, again in disagreement with D-brane results.
Dowker Fay
Kastor David
Traschen Jennie
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