Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s

Abstract Viscous accretion flow around a rotating supermassive black hole sitting in a quintessence tub is studied in this article. To introduce such a dark energy contaminated black hole’s gravitational force, a new pseudo-Newtonian potential is used. This pseudo-Newtonian force can be calculated i...

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Autores principales:	Ritabrata Biswas, Promila Biswas, Parthajit Roy
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/fc404c2aef9840dea873de1f59b69626
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spelling	oai:doaj.org-article:fc404c2aef9840dea873de1f59b696262021-11-14T12:13:46ZAccretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s10.1140/epjc/s10052-021-09755-91434-60441434-6052https://doaj.org/article/fc404c2aef9840dea873de1f59b696262021-11-01T00:00:00Zhttps://doi.org/10.1140/epjc/s10052-021-09755-9https://doaj.org/toc/1434-6044https://doaj.org/toc/1434-6052Abstract Viscous accretion flow around a rotating supermassive black hole sitting in a quintessence tub is studied in this article. To introduce such a dark energy contaminated black hole’s gravitational force, a new pseudo-Newtonian potential is used. This pseudo-Newtonian force can be calculated if we know the distance from the black hole’s center, spin of the black hole and equation of state of the quintessence inside which the black hole is considered to lie. This force helps us to avoid complicated nonlinearity of general relativistic field equations. Transonic, viscous, continuous and Keplerian flow is assumed to take place. Fluid speed, sonic speed profile and specific angular momentum to Keplerian angular momentum ratio are found out for different values of spin parameter and quintessence parameter. Density variation is built and tallied with observations. Shear viscosity to entropy density ratio is constructed for our model and a comparison with theoretical lower limit is done.Ritabrata BiswasPromila BiswasParthajit RoySpringerOpenarticleAstrophysicsQB460-466Nuclear and particle physics. Atomic energy. RadioactivityQC770-798ENEuropean Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Ritabrata Biswas Promila Biswas Parthajit Roy Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s
description	Abstract Viscous accretion flow around a rotating supermassive black hole sitting in a quintessence tub is studied in this article. To introduce such a dark energy contaminated black hole’s gravitational force, a new pseudo-Newtonian potential is used. This pseudo-Newtonian force can be calculated if we know the distance from the black hole’s center, spin of the black hole and equation of state of the quintessence inside which the black hole is considered to lie. This force helps us to avoid complicated nonlinearity of general relativistic field equations. Transonic, viscous, continuous and Keplerian flow is assumed to take place. Fluid speed, sonic speed profile and specific angular momentum to Keplerian angular momentum ratio are found out for different values of spin parameter and quintessence parameter. Density variation is built and tallied with observations. Shear viscosity to entropy density ratio is constructed for our model and a comparison with theoretical lower limit is done.
format	article
author	Ritabrata Biswas Promila Biswas Parthajit Roy
author_facet	Ritabrata Biswas Promila Biswas Parthajit Roy
author_sort	Ritabrata Biswas
title	Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s
title_short	Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s
title_full	Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s
title_fullStr	Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s
title_full_unstemmed	Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s
title_sort	accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/fc404c2aef9840dea873de1f59b69626
work_keys_str_mv	AT ritabratabiswas accretionontoaquintessencecontaminatedrotatingblackholeviolatingthelowerlimitforetaovers AT promilabiswas accretionontoaquintessencecontaminatedrotatingblackholeviolatingthelowerlimitforetaovers AT parthajitroy accretionontoaquintessencecontaminatedrotatingblackholeviolatingthelowerlimitforetaovers
_version_	1718429384864432128

Accretion onto a quintessence contaminated rotating black hole: violating the lower limit for eta over s

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