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

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.

10 pages, LaTeX

References in corpus (22)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Covariant Galileon
• Healthy theories beyond Horndeski
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Exploring gravitational theories beyond Horndeski
• Degenerate higher order scalar-tensor theories beyond Horndeski up to cubic order
• Is Local $H_0$ At Odds With Dark Energy EFT?
• Stability of Geodesically Complete Cosmologies
• Bianchi Model CMB Polarization and its Implications for CMB Anomalies
• First-order thermodynamics of Horndeski gravity
• Thermodynamics of scalar-tensor gravity
• First-order thermodynamics of scalar-tensor cosmology
• Scalar field as a perfect fluid: thermodynamics of minimally coupled scalars and Einstein frame scalar-tensor gravity
• Microphysical manifestations of viscosity and consequences for anisotropies in the very early universe
• Horndeski meets McVittie: A scalar field theory for accretion onto cosmological black holes
• Searching for dark energy with the Sun
• Past-directed scalar field gradients and scalar-tensor thermodynamics
• Quasi-geodesics in relativistic gravity
• Interstellar travels aboard radiation-powered rockets
• Vacuum self similar anisotropic cosmologies in $F(R)-$gravity

Cited by in corpus (6)

• First-order thermodynamics of Horndeski cosmology
• First-order thermodynamics of scalar-tensor gravity
• Alternative formulations of the thermodynamics of scalar-tensor theories
• Thermal channels of scalar and tensor waves in Jordan-frame scalar--tensor gravity
• Eckart heat-flux applicability in $F(\Phi ,X)R$ theories and the existence of temperature gradients
• Thermal description of braneworld effective theories