Constraints on Barrow Entropy from M87* and S2 Star Observations

dc.contributor.authorJusufi, Kimet
dc.contributor.authorAzreg-Ainou, Mustapha
dc.contributor.authorJamil, Mubasher
dc.contributor.authorSaridakis, Emmanuel N.
dc.date.accessioned2022-11-18T12:04:20Z
dc.date.available2022-11-18T12:04:20Z
dc.date.issued2022
dc.description.abstractWe use data from M87* central black hole shadow, as well as from the S2 star observations, in order to extract constraints on Barrow entropy. The latter is a modified entropy arising from quantum-gravitational effects on the black hole horizon, quantified by the new parameter & UDelta;. Such a change in entropy leads to a change in temperature, as well as to the properties of the black hole and its shadow. We investigate the photon sphere and the shadow of a black hole with Barrow entropy, and assuming a simple model for infalling and radiating gas we estimate the corresponding intensity. Furthermore, we use the radius in order to extract the real part of the quasinormal modes, and for completeness we investigate the spherical accretion of matter onto the black hole, focusing on isothermal and polytropic test fluids. We extract the allowed parameter region, and by applying a Monte-Carlo-Markov Chains analysis we find that & UDelta;& SIME; 0.0036(-0.0145)(+0.0792). Hence, our results place the upper bound & UDelta;& LSIM;0.0828 at 1 sigma, a constraint that is less strong than the Big Bang Nucleosynthesis one, but significantly stronger than the late-time cosmological constraints.en_US
dc.identifier.eissn2218-1997en_US
dc.identifier.endpage10en_US
dc.identifier.issue2en_US
dc.identifier.scopus2-s2.0-85124209959en_US
dc.identifier.startpage1en_US
dc.identifier.urihttps://arxiv.org/pdf/2110.07258.pdf
dc.identifier.urihttp://hdl.handle.net/11727/8133
dc.identifier.volume8en_US
dc.identifier.wos000762526900001en_US
dc.language.isoengen_US
dc.relation.isversionof10.3390/universe8020102en_US
dc.relation.journalUNIVERSEen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergien_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectmodified gravityen_US
dc.subjectbarrow entropyen_US
dc.subjectblack holes shadowen_US
dc.titleConstraints on Barrow Entropy from M87* and S2 Star Observationsen_US
dc.typearticleen_US

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