Spherical steady accretion flows : dependence on the cosmological constant, exact isothermal solutions, and applications to cosmology

Bibliographic description

punktacja MEiN [2013 A]: 35

title:	Spherical steady accretion flows : dependence on the cosmological constant, exact isothermal solutions, and applications to cosmology
author:	Mach Patryk , Malec Edward , Karkowski Janusz
journal title:	Physical Review. D, Particles, Fields, Gravitation, and Cosmology
volume:	88
issue:	8
date of publication :	2013
article ID:	084056
ISSN:	1550-7998
eISSN:	1550-2368
DOI:	10.1103/PhysRevD.88.084056
language:	English
journal language:	English
abstract in English:	We investigate spherical, isothermal and polytropic steady accretion models in the presence of the cosmological constant. Exact solutions are found for three classes of isothermal fluids, assuming the test gas approximation. The cosmological constant damps the mass accretion rate and–above a certain limit–completely stops the steady accretion onto black holes. A "homoclinic-type" accretion flow of polytropic gas has been discovered in anti–de Sitter spacetimes in the test-gas limit. These results can have cosmological connotation, through the Einstein-Straus vacuole model of embedding local structures into Friedman-Lemaitre-Robertson-Walker spacetimes. In particular, one infers that steady accretion would not exist in the late phases of Penrose’s scenario of the evolution of the Universe, known as the Weyl curvature hypothesis.
number of pulisher's sheets:	1
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper

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