Jacobson's thermodynamic approach applied to non-Riemannian geometries selects the Einstein-Hilbert action plus a quadratic torsion term as Nature's choice when non-metricity is absent and the metric energy-momentum tensor is used.
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In metric-affine FLRW cosmology a dark dust fluid with spin hypermomentum acquires a dynamical effective equation of state that may relate to DESI DR2 observations.
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Jacobson's thermodynamic approach to classical gravity applied to non-Riemannian geometries: remarks on the simplicity of Nature
Jacobson's thermodynamic approach applied to non-Riemannian geometries selects the Einstein-Hilbert action plus a quadratic torsion term as Nature's choice when non-metricity is absent and the metric energy-momentum tensor is used.
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Friedmann cosmology with fluids and hyperfluids
In metric-affine FLRW cosmology a dark dust fluid with spin hypermomentum acquires a dynamical effective equation of state that may relate to DESI DR2 observations.