High-scale inflation and the tensor tilt
Abstract
In this paper, we explore a novel observational signature of gravitational corrections during slow-roll inflation. We study the coupling of the inflaton field to higher-curvature tensors in models with a minimal breaking of conformal symmetry. In that case, the most general correction to the tensor two-point function is captured by a coupling to the square of the Weyl tensor. We show that these scenarios lead to a correction to the tilt of the tensor power spectrum and hence a violation of the tensor consistency condition. We arrive at the same conclusion through an analysis in conformal perturbation theory.
- Publication:
-
Journal of High Energy Physics
- Pub Date:
- January 2016
- DOI:
- 10.1007/JHEP01(2016)101
- arXiv:
- arXiv:1507.07250
- Bibcode:
- 2016JHEP...01..101B
- Keywords:
-
- Models of Quantum Gravity;
- Conformal and W Symmetry;
- Space-Time Symmetries;
- Gauge-gravity correspondence;
- High Energy Physics - Theory;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- High Energy Physics - Phenomenology
- E-Print:
- 20 pages, 1 figure