Consistent mass formulas for higher even-dimensional Taub-NUT spacetimes and their AdS counterparts

TL;DR

This paper develops a consistent thermodynamic framework for higher even-dimensional Lorentzian Taub-NUT spacetimes, extending previous four-dimensional results to six, eight, and ten dimensions, and generalizing to their AdS counterparts.

Contribution

It introduces a novel approach to the thermodynamics of higher-dimensional Taub-NUT spacetimes, including new mass formulas and the treatment of NUT charge as a multi-hair.

Findings

First law and Bekenstein-Smarr formulas are satisfied with secondary hair J_n = Mn.

Results extend to higher even dimensions with nonzero cosmological constant.

Mass formulas are derived with J_n as a redundant thermodynamic variable.

Abstract

Currently, there is a great deal of interest in the seeking of consistent thermodynamics of the Lorentzian Taub-NUT spacetimes. Despite a lot of ``satisfactory'' efforts have been made, all of these activities have been restricted to the four-dimensional cases, with the higher even-dimensional cases remaining unexplored. The aim of this article is to fill the gap, for the first time. To the end of this subject, we first adopt our own idea that ``The NUT charge is a thermodynamical multi-hair" to investigate the consistent thermodynamics of $D = 6, 8, 10$ Lorentzian Taub-NUT spacetimes without a cosmological constant. Similarly to the $D = 4$ cases as did in our previous works, we find that the first law and Bekenstein-Smarr mass formulas are perfectly satisfied if we still assign the secondary hair: $J_n = Mn$ as a conserved charge in both mass formulae. Turning to the cases with a nonzero cosmological constant, our treatment continues to work very well and all the results can be fairly generalized to the corresponding Taub-NUT AdS spacetimes in higher even-dimensions, although we do not know how to define and introduce a similar higher-dimensional version of the dual (magnetic) mass that is well known in four dimensions. Based upon the preceding results, we will also derive the reduced version of the mass formulae when the secondary hair $J_n$ is viewed as a redundant thermodynamic variable.