Quantum gravity phenomenology from thermodynamics of spacetime - INSPIRE

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Quantum gravity phenomenology from thermodynamics of spacetime

2023

17 pages

Contribution to:

- MG16
, 462-478

Published: 2023

DOI:

10.1142/9789811269776_0033

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Abstract: (World Scientific)

In this review, we discuss a derivation of effective low energy quantum gravitational dynamics from thermodynamics. The derivation is based on the formalism developed in semiclassical thermodynamics of spacetime that allows to obtain Einstein equations from the proportionality of entropy to the area. We first introduce the relevant ingredients of semiclassical thermodynamics of spacetime, paying special attention to the various concepts of entropy involved and their relations. We then extend the semiclassical formalism by considering low energy quantum gravity effects which imply a modified entropy formula with an additional term logarithmic in the area. Upon discussing the derivation of effective gravitational dynamics from this modified entropy, we comment on the most important features of our proposal. Moreover, we show its physical implications on a simple cosmological model and show that it suggests the replacement of the Big Bang singularity by a regular bounce.

Quantum gravity phenomenology
Thermodynamics of spacetime
thermodynamics: semiclassical
energy: low
big bang: singularity
quantum gravity: effect
space-time
entropy
gravitation
bounce

References(72)

Figures(0)

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