Abstract
We study aspects of the extended gravitational thermodynamics for the Taub–NUT and Taub–Bolt geometries in four dimensional locally anti-de Sitter spacetime, where the cosmological constant is treated as a dynamical pressure. Attention is paid to the phase structure in the (p, T) plane, which has a line of first order phase transitions extending from the origin. We argue for a dynamical interpretation of the unstable physics in the negative specific heat region. A deformation corresponding to a dyonic Taub–NUT/Bolt system is also explored, and the effect of the deformation on the phase diagram is characterized.
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