Thermodynamics of k-essence

Details Thermodynamics of k-essence Thermodynamics of k-essence

2008-06-03

arxiv.org/abs/0806.0642v2

Phys.Rev.D78:105012,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, minor changes, typos corrected, a comment on causality and speed of sound added, references added

Scientific paper

10.1103/PhysRevD.78.105012

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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