First-order thermodynamics of scalar-tensor cosmology

Abstract

A new thermodynamics of scalar-tensor gravity is applied to spatially homogeneous and isotropic cosmologies in this class of theories and tested on analytical solutions. A forever-expanding universe approaches the Einstein "state of equilibrium" with zero effective temperature at late times and departs from it near spacetime singularities. "Cooling" by expansion and "heating" by singularities compete near the Big Rip, where it is found that the effective temperature diverges in the case of a conformally coupled scalar field.

arXiv comment18 pages, no figures

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• Peculiar thermal states in the first-order thermodynamics of gravity
• Past-directed scalar field gradients and scalar-tensor thermodynamics
• Thermal stability of stealth and de Sitter spacetimes in scalar-tensor gravity
• Thermal origin of the attractor-to-general-relativity in scalar-tensor gravity
• First-order thermodynamics of scalar-tensor gravity
• First-order thermodynamics of Horndeski cosmology
• Black hole ringdown from physically sensible initial value problem in higher-order 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
• No-Go Theorems for Hairy Black Holes in Scalar- or Vector-Tensor-Gauss-Bonnet Theory
• Thermal description of braneworld effective theories