Thermodynamics as a tool for (quantum) gravitational dynamics - INSPIRE

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Thermodynamics as a tool for (quantum) gravitational dynamics

May 19, 2023

17 pages

Published in:

Int.J.Mod.Phys.D 32 (2023) 14, 2342018

Published: Sep 20, 2023

e-Print:

2305.11756 [gr-qc]

DOI:

10.1142/S021827182342018X

View in:

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Abstract: (WSP)

The thermodynamics of local causal horizons has been shown to imply gravitational dynamics. In this essay, we discuss the principles underlying this observation, and its significance in our understanding of (quantum) gravity. We also show why the local thermodynamic methods cannot by themselves recover general relativity. Instead, they lead to the so-called Weyl transverse gravity. Because of this, local thermodynamic approaches avoid huge vacuum energy contributions to the cosmological constant. They even suggest a possible source for its small observed value. We also outline a way in which thermodynamics allows us to study low energy quantum gravitational effects. We arrive at quantum corrections to the gravitational equations which are suppressed by the Planck length squared.

Note:

10 pages. Essay received Honorable Mention at the Gravity Research Foundation 2023 Awards for Essays on Gravitation. Matches the version accepted in IJMPD

Thermodynamics of spacetime
unimodular gravity
Weyl transverse gravity
quantum gravity phenomenology
causal diamonds
quantum gravity: effect
correction: quantum
gravitation: transverse
vacuum state: energy
energy: low

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