Towards a causal effective thermodynamics of scalar-tensor gravity
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866917526505521152 |
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| author | Banerjee, Narayan Giusti, Andrea Faraoni, Valerio Gallerani, Luca Maltais-Gosselin, Alain |
| author_facet | Banerjee, Narayan Giusti, Andrea Faraoni, Valerio Gallerani, Luca Maltais-Gosselin, Alain |
| contents | The thermal analogy between the effective fluid of scalar-tensor gravity and Eckart's irreversible thermodynamics is extended to the causal Israel-Stewart model, adopting the minimal ansatz of promoting the heat flux density to a timelike vector. This choice yields analytically manageable constitutive equations, allowing for the first consistent decoupling of the effective temperature $\mathcal{T}$ and the effective thermal conductivity $\mathcal{K}$ of scalar-tensor gravity. Crucially, this new framework preserves the interpretation of general relativity as the equilibrium state approached via a dynamical relaxation process in the vanishing-$\mathcal {KT}$ limit. This new causal formalism is applied to cosmology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_24133 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Towards a causal effective thermodynamics of scalar-tensor gravity Banerjee, Narayan Giusti, Andrea Faraoni, Valerio Gallerani, Luca Maltais-Gosselin, Alain General Relativity and Quantum Cosmology 83D05, 80A17 The thermal analogy between the effective fluid of scalar-tensor gravity and Eckart's irreversible thermodynamics is extended to the causal Israel-Stewart model, adopting the minimal ansatz of promoting the heat flux density to a timelike vector. This choice yields analytically manageable constitutive equations, allowing for the first consistent decoupling of the effective temperature $\mathcal{T}$ and the effective thermal conductivity $\mathcal{K}$ of scalar-tensor gravity. Crucially, this new framework preserves the interpretation of general relativity as the equilibrium state approached via a dynamical relaxation process in the vanishing-$\mathcal {KT}$ limit. This new causal formalism is applied to cosmology. |
| title | Towards a causal effective thermodynamics of scalar-tensor gravity |
| topic | General Relativity and Quantum Cosmology 83D05, 80A17 |
| url | https://arxiv.org/abs/2605.24133 |