Cosmology with Unparticles

Details Cosmology with Unparticles Cosmology with Unparticles

2008-09-05

arxiv.org/abs/0809.0977v2

Phys.Rev.D80:103518,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Expanded version of the original submission. 13 pages, 1 figure, requires revtex4

Scientific paper

10.1103/PhysRevD.80.103518

We discuss cosmological consequences of the existence of physics beyond the standard model that exhibits Banks-Zaks and unparticle behavior in the UV and IR respectively. We first derive the equation of state for unparticles and use it to obtain the temperature dependence of the corresponding energy and entropy densities. We then formulate the Boltzmann and Kubo equations for both the unparticles and the Banks-Zaks particles, and use these results to determine the equilibrium conditions between the standard model and the new physics. We conclude by obtaining the constraints on the effective number of degrees of freedom of unparticles imposed by Big-Bang nucleosynthesis.

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