Thermodynamics of Dark Energy

Understand

Thermodynamic properties of dark energy are discussed assuming that dark energy is described in terms of a selfinteracting complex scalar.

• We first show that, under certain assumptions, selfinteracting complex scalar field theories are equivalent to purely kinetic k-essence models.
• Then we analyze the themal properties of k-essence and in particular we show that dark-energy in the phantom regime does not necessarily yield negative entropy.