Mass and Thermodynamic Volume in Lifshitz Spacetimes

TL;DR

This paper investigates the thermodynamic properties of Lifshitz black holes, establishing a consistent definition of mass and volume that satisfy the extended Smarr relation and first law in non-asymptotically flat spacetimes.

Contribution

It introduces a consistent framework for defining thermodynamic mass and volume in Lifshitz spacetimes, extending black hole thermodynamics beyond AdS spaces.

Findings

The generalized Smarr relation holds in Lifshitz spacetimes.

A consistent definition of thermodynamic mass and volume is proposed.

Comparison with other mass definitions shows compatibility and differences.

Abstract

We examine the concept of black hole thermodynamic volume and its consistency with thermodynamic mass in spacetimes that are not asymptotically flat but instead have anisotropic Lifshitz scaling symmetry. We find that the generalized Smarr relation in anti de Sitter space -- extended to include a pressure-volume term -- holds here as well, and that there exists a definition of thermodynamic mass and thermodynamic volume that satisfy both this relation and the $1^{st}$ law of thermodynamics. We compare the thermodynamic mass with other known quantities such as ADM, Brown-York and Hollands-Ishibashi-Marolf masses. We also conjecture methods for obtaining a thermodynamic mass where there is ambiguity due to the cosmological constant lengthscale depending on the horizon radius lengthscale.