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Absorption by stringy black holes
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DOI：10.1140/epjc/s10052-021-09933-9.png)
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We investigate the absorption of planar massless scalar waves by a charged rotating stringy black hole, namely a Kerr-Sen black hole. We compute numerically the absorption cross section and compare our results with those of the Kerr-Newman black hole, a classical general relativity solution. In order to better compare both charged black holes, we define the ratio of the black hole charge to the extreme charge as Q. We conclude that Kerr-Sen and Kerr-Newman black holes have a similar absorption cross section, with the difference increasing for higher values of Q.
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