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Thin accretion disk around Kerr-Sen black hole in Einstein-Maxwell-dilaton-axion gravity

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arXiv:2403.18541v1 Announce Type: cross
Abstract: We investigate the accretion process in a thin disk surrounding a supermassive black hole in Einstein-Maxwell-dilaton-axion gravity by using the Novikov-Thorne model. Our exploration focuses on understanding the impact of the model parameter on various physical properties of the disk. The results reveal that as the dilaton parameter $r_2$ increases, the energy flux, radiation temperature, spectra luminosity, and conversion efficiency of the disk all increase. By narrowing down the dilaton parameter range to $0\leqslant r_2\leqslant0.4$ M, we discover that in the high-frequency region, the Kerr-Sen black hole demonstrates higher energy output compared to the Kerr black hole. This facilitates a more straightforward examination of the observational results for two black holes.

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