English

Tribrid Inflation in Supergravity

High Energy Physics - Phenomenology 2015-05-13 v1 Cosmology and Nongalactic Astrophysics High Energy Physics - Theory

Abstract

We propose a novel class of F-term hybrid inflation models in supergravity (SUGRA) where the η\eta-problem is resolved using either a Heisenberg symmetry or a shift symmetry of the Kaehler potential. In addition to the inflaton and the waterfall field, this class (referred to as tribrid inflation) contains a third 'driving' field which contributes the large vacuum energy during inflation by its F-term. In contrast to the ''standard'' hybrid scenario, it has several attractive features due to the property of vanishing inflationary superpotential (W_inf=0) during inflation. While the symmetries of the Kaehler potential ensure a flat inflaton potential at tree-level, quantum corrections induced by symmetry breaking terms in the superpotential generate a slope of the potential and lead to a spectral tilt consistent with recent WMAP observations.

Keywords

Cite

@article{arxiv.0908.1694,
  title  = {Tribrid Inflation in Supergravity},
  author = {Stefan Antusch and Koushik Dutta and Philipp M. Kostka},
  journal= {arXiv preprint arXiv:0908.1694},
  year   = {2015}
}

Comments

To appear in the proceedings of SUSY09; 5 pages

R2 v1 2026-06-21T13:34:47.457Z