Gravothermal Catastrophe with a Cosmological Constant
Cosmology and Nongalactic Astrophysics
2012-11-05 v2 General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
We investigate the effect of a cosmological constant on the gravothermal catastrophe in the Newtonian limit. A negative cosmological constant acts as a thermodynamic `destabilizer'. The Antonov radius gets smaller and the instability occurs, not only for negative but also for positive energy values. A positive cosmological constant acts as a `stabilizer' of the system, which, in this case, exhibits a novel `reentrant behaviour'. In addition to the Antonov radius we find a second critical radius, where an `inverse Antonov transition' occurs; a series of local entropy maxima is restored.
Keywords
Cite
@article{arxiv.1206.2839,
title = {Gravothermal Catastrophe with a Cosmological Constant},
author = {Minos Axenides and George Georgiou and Zacharias Roupas},
journal= {arXiv preprint arXiv:1206.2839},
year = {2012}
}
Comments
some text in last section added; references added; 1 figure added