Black Hole Greybody Factors and Absorption of Scalars by Effective Strings

Abstract

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.

arXiv comment20 pages, harvmac; two references added

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• The Bekenstein Formula and String Theory (N-brane Theory)
• Absorption of photons and fermions by black holes in four dimensions
• Maxwell's Equations in the Myers-Perry Geometry
• Greybody Factors for Black Holes in Four Dimensions: Particles with Spin
• Fractional Brane State in the Early Universe
• The Hawking effect and the bounds on greybody factor for higher dimensional Schwarzschild black holes
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• A Very Effective String Model?
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• Absorption Cross-Section and Decay Rate of Dilatonic Black Strings
• Greybody Factor for a Rotating Bardeen Black Hole by Perfect Fluid Dark Matter
• D-branes and Creation of Strings
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