Enhancing inflationary tensor modes through spectator fields
Abstract
We show that a large contribution to tensor modes during inflation can be generated by a spectator scalar field with a speed of sound lower than unity.
- Publication:
-
Physical Review D
- Pub Date:
- November 2013
- DOI:
- 10.1103/PhysRevD.88.103518
- arXiv:
- arXiv:1305.7241
- Bibcode:
- 2013PhRvD..88j3518B
- Keywords:
-
- 98.80.Cq;
- 04.30.Db;
- Particle-theory and field-theory models of the early Universe;
- Wave generation and sources;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Phenomenology
- E-Print:
- 5 pages, 2 figures