Natural Chaotic Inflation Model in Supergravity

Details Natural Chaotic Inflation Model in Supergravity Natural Chaotic Inflation Model in Supergravity

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cosm.conf..133y&link_type=abstract

COSMO-2000 . Proceedings of the Fourth International Workshop on Particle Physics and the Early Universe . Held 4-8 September 20

Physics

Scientific paper

We propose a chaotic inflation model in supergravity. In the model the Kähler potential has a Nambu-Goldstone-like shift symmetry of the inflaton chiral multiplet which ensures the flatness of the inflaton potential beyond the Planck scale. We show that the chaotic inflation naturally takes place by introducing a small breaking term of the shift symmetry in the superpotential. As an alternative scenario, we also propose new inflation with a chaotic initial condition. In this scenario, chaotic inflation first takes place around the Planck scale, which solves the longevity problem, and also gives an adequate initial condition for new inflation. Then, new inflation lasts long to generate primordial fluctuations for the large scale structure, which generally has a tilted spectrum with the spectral index ns < 1.

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