Unparticles and inflation

Details Unparticles and inflation Unparticles and inflation

2008-02-29

arxiv.org/abs/0802.4416v2

Phys.Rev.D78:025023,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 3 eps figures, uses ReVTeX; replaced with published version

Scientific paper

10.1103/PhysRevD.78.025023

We study some of the roles for unparticles in an inflationary universe. Unparticles by themselves are not appropriate for generating the primordial perturbations since their power spectrum does not match what has been inferred from observations. In fact, when the scaling dimension for the unparticles exceeds three-halves, the unparticle power spectrum diverges. However, when a unparticle couples to an ordinary inflaton particle, loop corrections can produce a slight enhancement of the inflaton's power spectrum at longer wavelengths. We examine these loop corrections from unparticles in some detail to learn how they scale in the wavelength of a perturbation and how they depend on the scaling dimension of the field.

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