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 rightmoving temperatures are much smaller than the square root of the effective string tension, we find a nontrivial 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.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1997
 DOI:
 10.1016/S05503213(97)002873
 arXiv:
 arXiv:hepth/9701187
 Bibcode:
 1997NuPhB.500..115K
 Keywords:

 High Energy Physics  Theory
 EPrint:
 20 pages, harvmac