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First-order thermodynamics of Horndeski gravity

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arxiv 2108.10706 v1 pith:226V2ZCR submitted 2021-08-24 gr-qc hep-th

Andrea Giusti , Stefan Zentarra , Lavinia Heisenberg , Valerio Faraoni This is my paper · ORCID
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We extend to the Horndeski realm the irreversible thermodynamics description of gravity previously studied in "first generation" scalar-tensor theories. We identify a subclass of Horndeski theories as an out-of--equilibrium state, while general relativity corresponds to an equilibrium state. In this context, we identify an effective heat current, "temperature of gravity", and shear viscosity in the space of theories. The identification is accomplished by recasting the field equations as effective Einstein equations with an effective dissipative fluid, with Einstein gravity as the equilibrium state, following Eckart's first-order thermodynamics.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Gravitational Waves as Thermodynamic Shear Excitations in Scalar-Tensor Gravity

    gr-qc 2026-07 accept novelty 6.0 of 10

    In scalar-tensor gravity, a transverse-traceless gravitational wave performs gauge-invariant shear work on the scalar-field fluid, with power = (KT/4) times the squared strain rate.

  2. Towards a causal effective thermodynamics of scalar-tensor gravity

    gr-qc 2026-05 unverdicted novelty 6.0 of 10

    Extends scalar-tensor gravity thermodynamics to causal Israel-Stewart model via timelike heat flux ansatz, decoupling T and K while preserving GR equilibrium.

  3. Cosmological constraints and standard sirens forecasts for non-dynamical dark energy in Horndeski gravity

    astro-ph.CO 2026-08 conditional novelty 5.0 of 10

    Standard sirens from third-generation detectors could measure H0 to 0.21% in Extended Cuscuton models, but the forecast omits the modified GW luminosity distance.

  4. Cosmological scalar perturbations in Horndeski-like gravity

    gr-qc 2025-01 conditional novelty 4.0 of 10

    For a Horndeski-like scalar-tensor model with a chosen background solution, scalar stability and entropy-production bounds restrict the coupling gamma to be non-positive and constrain gamma*Lambda relative to alpha.

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