NBIA Workshop: Field Theory and Cosmology – Niels Bohr Institute - University of Copenhagen

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NBIA Workshop: Field Theory and Cosmology

Unparticles and inflation

Hael Collins (Niels Bohr International Academy)



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.