Dark energy from coexistence of phases

Details Dark energy from coexistence of phases Dark energy from coexistence of phases

2005-09-12

arxiv.org/abs/astro-ph/0509291v4

Phys.Lett.B642:287-293,2006

Astronomy and Astrophysics

Astrophysics

11 pages. Contents significantly enlarged to make explanations clearer. Conclusions unchanged

Scientific paper

10.1016/j.physletb.2006.09.057

We suggest that the current acceleration of the universe may be explained by the vacuum energy of a hidden sector which is stuck in a state of equilibrium between phases. The phases are associated to a late-time first-order phase transition, where phase coexistence originates at a temperature $T_c \sim 10^{-3}eV$ and lasts until temperature falls below $T\sim 10^{-4}eV$. During phase coexistence, the energy density has an effective cosmological constant component with the observed magnitude. This scenario does not require supercooling and may arise naturally in realistic models.

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