### Abstract

When the cosmological constant, Lambda, is interpreted as a thermodynamic variable in the study of black hole thermodynamics a very rich structure emerges. It is natural to interpret Lambda as a pressure and define the thermodynamically conjugate variable to be the thermodynamic volume of the black hole (which need not bear any relation to the geometric volume). Recent progress in this new direction for black hole thermodynamics is reviewed.

Original language | English |
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Article number | 1540002 |

Number of pages | 20 |

Journal | Modern Physics Letters A |

Volume | 30 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - 10 Feb 2015 |

### Keywords

- Black holes
- thermodynamics
- cosmological constant
- pressure
- critical point
- P-V CRITICALITY
- EXTENDED PHASE-SPACE
- BORN-INFELD GRAVITY
- GENERAL-RELATIVITY
- EHRENFEST SCHEME
- 1ST LAW
- FIELD-THEORIES
- ENERGY
- GEOMETRY
- ENTROPY

### ASJC Scopus subject areas

- Astronomy and Astrophysics
- Nuclear and High Energy Physics

## Cite this

Dolan, B. P. (2015). Black holes and Boyle's law - The thermodynamics of the cosmological constant.

*Modern Physics Letters A*,*30*(3-4), [1540002]. https://doi.org/10.1142/S0217732315400027