A general derivation of the first law and Smarr formula for arbitrary generalized entropies yields a Ruppeiner curvature that vanishes exactly when the entropy obeys the Abé composition rule and diverges otherwise.
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Perturbed Boltzmann modeling with Tsallis statistics indicates pair freeze-out may increase high-frequency photons during BBN, temporarily breaking chemical equilibrium and supporting a prior ansatz for the lithium problem.
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Generalized First Law and Smarr Formula: Beyond Additivity and Extensivity
A general derivation of the first law and Smarr formula for arbitrary generalized entropies yields a Ruppeiner curvature that vanishes exactly when the entropy obeys the Abé composition rule and diverges otherwise.
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Effects of pair freeze-out on photon distributions in BBN epoch
Perturbed Boltzmann modeling with Tsallis statistics indicates pair freeze-out may increase high-frequency photons during BBN, temporarily breaking chemical equilibrium and supporting a prior ansatz for the lithium problem.