Hydrostatic equilibrium and Tsallis’ equilibrium for self-gravitating systems
نویسندگان
چکیده
منابع مشابه
Self-Gravitating N-Body Systems out of Equilibrium
Real physical systems are often maintained off equilibrium by energy or matter flows. If these systems are far from equilibrium then the thermodynamical branch become unstable and fluctuations can lead them to other more stable states. These new states are often endowed with higher degrees of organization. In order to explore whether an energy-flow in combination with self-gravity can lead to c...
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We revisit the issues on the thermodynamic property of stellar self-gravitating system arising from Tsallis’ non-extensive entropy. Previous papers (Taruya & Sakagami, Physica A 307 (2002) 185 (cond-mat/0107494); ibid. (2002) in press (condmat/0204315)) have revealed that the extremum-state of Tsallis entropy characterized by the so-called stellar polytrope has consistent thermodynamic structur...
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We present a first physical application of Tsallis’ generalized entropy to the thermodynamics of self-gravitating systems. The stellar system confined in a spherical cavity of radius re exhibits an instability, so-called gravothermal catastrophe, which has been originally investigated by Antonov (Vest.Leningrad Gros.Univ. 7 (1962) 135) and Lynden-Bell & Wood (Mon.Not.R.Astron.Soc. 138 (1968) 49...
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It is shown that (except for two well defined cases), the necessary and sufficient condition for any spherically symmetric distribution of fluid to leave the state of equilibrium (or quasi–equilibrium), is that the Weyl tensor changes with respect to its value in the state of equilibrium (or quasi–equilibrium). ∗Postal address: Apartado 80793, Caracas 1080A, Venezuela; E-mail address: laherrera...
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We show that regular structures governed by an equation of state (EOS) or density variation such that the density at the surface does not vanish together with pressure (also known as self-bound regular structures) can not exist in the state of hydrostatic equilibrium. The only configuration which could exist in this regard is governed by homogeneous density distribution. Other structures which ...
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ژورنال
عنوان ژورنال: Open Physics
سال: 2005
ISSN: 2391-5471
DOI: 10.2478/bf02475644