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arXiv · 2302.01442

More on the first-order thermodynamics of scalar-tensor and Horndeski gravity

Valerio Faraoni·Julien Houle
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Abstract

Two issues in the first-order thermodynamics of scalar-tensor (including ``viable'' Horndeski) gravity are elucidated. The application of this new formalism to FLRW cosmology is shown to be fully legitimate and then extended to all Bianchi universes. It is shown that the formalism holds thanks to the almost miraculous fact that the constitutive relations of Eckart's thermodynamics are satisfied, while writing the field equations as effective Einstein equations with an effective dissipative fluid does not contain new physics.

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Valerio Faraoni, Julien Houle. 2023-02-02. More on the first-order thermodynamics of scalar-tensor and Horndeski gravity. https://doi.org/10.1140/epjc/s10052-023-11712-7

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