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Metastable Black Saturns · Around

2008

Metastable Black Saturns

Evslin, Jarah, Krishnan, Chethan

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Black Saturns have multiple horizons and so offer a testing ground for the ideas of black hole thermodynamics.

In this note, we numerically scan for phases that are in equilibrium by extremizing total entropy in the 2-dimensional moduli space of stationary, singly rotating black Saturns with fixed total mass and angular momentum.
On top of the known T_H=T_R, Omega_H=Omega_R configurations, we find phases that do not balance the temperature and angular velocity of the ring and the hole.
But these (and most of the balanced Saturns) go away when we demand that the system is metastable, by imposing that the Hessian of the entropy is negative definite.

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