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Journal Article

Scalar field as a perfect fluid: thermodynamics of minimally coupled scalars and Einstein frame scalar-tensor gravity

MPS-Authors
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Giardino,  Serena
Lise Meitner Excellence Group: Gravitational Theory and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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2208.04051.pdf
(Preprint), 239KB

s10052-023-11186-7.pdf
(Publisher version), 423KB

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Citation

Faraoni, V., Giardino, S., Giusti, A., & Vanderwee, R. (2023). Scalar field as a perfect fluid: thermodynamics of minimally coupled scalars and Einstein frame scalar-tensor gravity. European Physical Journal C, 83(1): 24. doi:10.1140/epjc/s10052-023-11186-7.


Cite as: https://hdl.handle.net/21.11116/0000-000A-EF46-B
Abstract
We revisit the analogy between a minimally coupled scalar field in general
relativity and a perfect fluid, correcting previous identifications of
effective temperature and chemical potential. This provides a useful
complementary picture for the first-order thermodynamics of scalar-tensor
gravity, paving the way for the Einstein frame formulation (which eluded
previous attempts) and raises interesting questions to further develop the
analogy.