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Speaker |
Chakraborty, Sumanta |
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Coauthors |
Banerjee, Indrani and SenGupta Soumitra |
| Talk Title |
Black holes in alternative theories and the structure of accretion disc |
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Abstract |
Continuum spectrum from black hole accretion disc holds enormous information regarding the strong gravity regime around the black hole and hence about the nature of gravitational interaction in extreme situations. To explore them I will discuss effects of these alternative theories on the black hole continuum spectrum in an explicit manner. In the scenarios under consideration we have shown that there can be signatures sculptured on the black hole continuum spectrum, distinct from the standard general relativistic scenario. Interestingly, all these models exhibit black hole solutions with tidal charge parameter which can become negative, in sharp contrast with the situation in general relativity. Using the observational data of optical luminosity for eighty Palomer Green quasars we have illustrated that the difference between the theoretical estimates and the observational results gets minimized for negative values of the tidal charge parameter, signaling the possibility of higher dimensions or, scalar hair at play in those high gravity regimes. |
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