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Note on the chemical potential of decoupled matter in the Universe

Textbooks on cosmology exhibit a thermodynamic inconsistency for free streaming, decoupled matter. It is connected here to the chemical potential, which deviates from its equilibrium value $μ=αk_BT$, where $α$ is the usual parameter of the Fermi-Dirac or Bose-Einstein distribution function.

preprint2011arXivOpen access
Theo M. NieuwenhuizenClaudia Pombo
astro-ph.COcond-mat.stat-mechgr-qc
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Theo M. NieuwenhuizenClaudia Pombo

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