Holes and Leading-Order Cross-Section of Generic Extremal p-branes
نویسنده
چکیده
We obtain the closed-form absorption probabilities for minimally-coupled massless scalars propagating in the background ofD = 5 single-charge andD = 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. 1 Research supported in part by DOE grant DOE-FG02-95ER40893 2 Research supported in part by DOE grant DOE-FG03-95ER40917
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