Natural Inflation From Fermion Loops

Details Natural Inflation From Fermion Loops Natural Inflation From Fermion Loops

1995-03-14

arxiv.org/abs/hep-ph/9503331v3

Phys.Rev. D52 (1995) 5529-5537

Physics

High Energy Physics

High Energy Physics - Phenomenology

(Revised) 15 pages, LaTeX (revTeX), 8 figures in uuencoded PostScript format. Version accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.52.5529

``Natural'' inflationary theories are a class of models in which inflation is driven by a pseudo-Nambu-Goldstone boson. In this paper we consider two models, one old and one new, in which the potential for inflation is generated by loop effects from a fermion sector which explicitly breaks a global $U(1)$ symmetry. In both models, we retrieve the ``standard'' natural inflation potential, $V\left(\theta\right) = \Lambda^4\left[1 + \cos\left(\theta / \mu\right)\right]$, as a limiting case of the exact one-loop potential, but we carry out a general analysis of the models including the limiting case. Constraints from the COBE DMR observation and from theoretical consistency are used to limit the parameters of the models, and successful inflation occurs without the necessity of fine-tuning the parameters.

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