Black Hole Greybody Factors and Absorption of Scalars by Effective Strings

Details Black Hole Greybody Factors and Absorption of Scalars by Effective Strings Black Hole Greybody Factors and Absorption of Scalars by Effective Strings

1997-01-30

arxiv.org/abs/hep-th/9701187v2

Nucl.Phys.B500:115-132,1997

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, harvmac; two references added

Scientific paper

10.1016/S0550-3213(97)00287-3

We compute the greybody factors for classical black holes in a domain where two kinds of charges and their anticharges are excited by the extra energy over extremality. We compare the result to the greybody factors expected from an effective string model which was earlier shown to give the correct entropy. In the regime where the left and right moving temperatures are much smaller than the square root of the effective string tension, we find a non-trivial greybody factor which agrees with the effective string model. However, if the temperatures are comparable with the square root of the effective string tension, the greybody factors agree only at the leading order in energy. Nevertheless, there are several interesting relations between the two results, suggesting that a modification of the effective string model might lead to better agreement.

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