Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-01-26
JHEP 9906:009,1999
Physics
High Energy Physics
High Energy Physics - Theory
Latex (3 times), 20 pages
Scientific paper
10.1088/1126-6708/1999/06/009
We obtain the closed-form absorption probabilities for minimally-coupled massless scalars propagating in the background of D=5 single-charge and D=4 two-charge black holes. These are the only two examples of extremal black holes with non-vanishing absorption probabilities that can be solved in closed form for arbitrary incident frequencies. In both cases, the absorption probability vanishes when the frequency is below a certain threshold, and we discuss the connection between this phenomenon and the behaviour of geodesics in these black hole backgrounds. We also obtain leading-order absorption cross-sections for generic extremal p-branes, and show that the expression for the cross-section as a function of frequency coincides with the leading-order dependence of the entropy on the temperature in the corresponding near-extremal p-branes.
Cvetic Mirjam
Lu Hai
Pope Christopher N.
Tran Tuan A.
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