arXiv:1305.7241·v2·Cosmology and Nongalactic Astrophysics
Enhancing Inflationary Tensor Modes through Spectator Fields
Matteo Biagetti🇨🇭 · Matteo Fasiello🇺🇸 · Antonio Riotto🇨🇭
Abstract
We show that a large contribution to tensor modes during inflation can be generated by a spectator scalar field with speed of sound lower than unity.
Comments: 5 pages, 2 figures