Multi-scalar-tensor gravity admits an exact covariant thermodynamic interpretation as an imperfect fluid whose heat flux involves a coupling-derived factor χ and a residual gradient sector, yielding multi-field thermal diagnostics and a GR-attractor criterion that is stricter than simple freezing of
Causal Thermodynamics in Relativity
6 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
I review the causal relativistic thermodynamics developed by Israel and Stewart, and discuss some applications in cosmology and astrophysics. The lectures begin with an overview of relativistic fluid dynamics (in a covariant formalism) and equilibrium thermodynamics. Causal bulk viscosity in cosmology is considered in detail, including some new results.
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Eckart heat flux holds for all timelike scalar configurations in F(Φ,X)R + G theories if and only if F_X ≡ 0, reducing the theory to a Jordan-like subclass of Horndeski.
A non-variational method for coupling scalar fields to gravity reproduces known models and produces asymptotically Kasner Bianchi I solutions under specific conditions.
Scalar and tensor perturbations in Jordan-frame scalar-tensor gravity admit an exact linear-order Eckart effective-fluid description, with gravitational-wave damping governed by the scalar sector's transverse-traceless anisotropic stress.
Fractional entropy on the apparent horizon yields stable modified cosmology that fits late-time data best at α near 2, shifting H0 upward as α decreases.
A BGK collision term yields first-order Chapman-Enskog thermal coefficients that close the Einstein-Boltzmann system for spatially homogeneous models with dissipation.
citing papers explorer
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First-order thermodynamics of multi-scalar-tensor gravity
Multi-scalar-tensor gravity admits an exact covariant thermodynamic interpretation as an imperfect fluid whose heat flux involves a coupling-derived factor χ and a residual gradient sector, yielding multi-field thermal diagnostics and a GR-attractor criterion that is stricter than simple freezing of
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Eckart heat-flux applicability in $F(\Phi,X)R$ theories and the existence of temperature gradients
Eckart heat flux holds for all timelike scalar configurations in F(Φ,X)R + G theories if and only if F_X ≡ 0, reducing the theory to a Jordan-like subclass of Horndeski.
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A general formalism for coupling scalar fields to the Einstein equations without a variational principle
A non-variational method for coupling scalar fields to gravity reproduces known models and produces asymptotically Kasner Bianchi I solutions under specific conditions.
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Thermal channels of scalar and tensor waves in Jordan-frame scalar--tensor gravity
Scalar and tensor perturbations in Jordan-frame scalar-tensor gravity admit an exact linear-order Eckart effective-fluid description, with gravitational-wave damping governed by the scalar sector's transverse-traceless anisotropic stress.
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Thermodynamic behavior of cosmological models with fractional entropy
Fractional entropy on the apparent horizon yields stable modified cosmology that fits late-time data best at α near 2, shifting H0 upward as α decreases.
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The near equilibrium Einstein-Boltzmann system with a simplified collision term
A BGK collision term yields first-order Chapman-Enskog thermal coefficients that close the Einstein-Boltzmann system for spatially homogeneous models with dissipation.