Particle Dark Energy

Details Particle Dark Energy Particle Dark Energy

2004-11-11

arxiv.org/abs/astro-ph/0411283v2

Phys.Rev. D73 (2006) 043520

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures; minor update with added refs; version appearing in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.73.043520

We explore the physics of a gas of particles interacting with a condensate that spontaneously breaks Lorentz invariance. The equation of state of this gas varies from 1/3 to less than -1 and can lead to the observed cosmic acceleration. The particles are always stable. In our particular class of models these particles are fermions with a chiral coupling to the condensate. They may behave as relativistic matter at early times, produce a brief period where they dominate the expansion with w<0 today, and behave as matter at late time. There are no small parameters in our models, which generically lead to dark energy clustering and, depending on the choice of parameters, smoothing of small scale power.

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