Thursday, June 14, 2012

1206.2839 (Minos Axenides et al.)

Gravothermal Catastrophe with a Cosmological Constant    [PDF]

Minos Axenides, George Georgiou, Zacharias Roupas
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, presents 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.
View original: http://arxiv.org/abs/1206.2839

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