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Absorption by stringy black holes

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arxiv 2112.12865 v1 pith:5BOIDIYQ submitted 2021-12-23 gr-qc

classification gr-qc
keywords blackabsorptionholeholeschargechargedcomparecross
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abstract

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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  1. Absorption spectrum and greybody factors of charged black holes in loop quantum gravity

    gr-qc 2026-08 conditional novelty 6.0 of 10

    The absorption cross section of massless scalar waves by a charged loop-quantum-gravity black hole increases with the quantum parameter in an intermediate frequency band, decreases with charge, and matches classical a...

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