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

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.

arXiv comment19 pages, latex

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Cited by in corpus (13)

• More on the first-order thermodynamics of scalar-tensor and Horndeski gravity
• Past-directed scalar field gradients and scalar-tensor thermodynamics
• Interacting Scalar fields: Dark matter and early dark energy
• Thermal origin of the attractor-to-general-relativity in scalar-tensor gravity
• First-order thermodynamics of Horndeski cosmology
• First-order thermodynamics of scalar-tensor gravity
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• Scalar-tensor theories of gravity from a thermodynamic viewpoint
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• Thermal description of braneworld effective theories
• Covariant single-field formulation of effective cosmological bounces