Double D-term inflation

Details Double D-term inflation Double D-term inflation

1998-11-05

arxiv.org/abs/hep-ph/9811255v3

Phys.Lett. B452 (1999) 15-22

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, revised version accepted for publication in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(99)00264-6

Comparisons of cosmological models to current data show that the presence of a non-trivial feature in the primordial power spectrum of fluctuations, around the scale k=0.05 h/Mpc, is an open and exciting possibility, testable in a near future. This could set new constraints on inflationary models. In particular, current data favour a Lambda-CDM model with a steplike spectrum, and more power on small scales. So far, this possibility has been implemented only in toy models of inflation. In this work, we propose a supersymmetric model with two U(1) gauge symmetries, associated with two Fayet-Iliopoulos terms. Partial cancellation of the Fayet-Iliopoulos by one of the charged fields generates a step in the primordial power spectrum of adiabatic perturbations. We show that when this field if charged under both symmetries, the spectrum may have more power on small scales.

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