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Thermodynamics of k-essence

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arxiv 0806.0642 v2 pith:NMYS7UAY submitted 2008-06-03 gr-qc astro-phhep-th

classification gr-qcastro-phhep-th
keywords energyk-essencedarkentropyequalfieldformalismaddition
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We discuss thermodynamic properties of dark energy using the formalism of field theory at finite temperature. In particular, we apply our formalism to a purely kinetic type of k-essence. We show quite generally that the entropy associated with dark-energy is always equal or greater than zero. Hence, contrary to often stated claims, a violation of the null energy condition (phantom dark energy) does not necessarily yield a negative entropy. In addition, we find that the thermal fluctuations of a k-essence field may be represented by a free boson gas with an effective number of degrees of freedom equal to c_s^{-3}.

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  1. The role of the chemical potential in coupling superfluid dark matter to baryons

    astro-ph.GA 2019-09 conditional novelty 6.0 of 10

    In superfluid dark matter, the charge tied to the chemical potential is not conserved, so the chemical potential is only an approximation valid on timescales much shorter than 10^8 years; the paper gives the correct p...

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