Towards general patterns of features in multi-field inflation
Cosmology and Nongalactic Astrophysics
2015-09-30 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We investigate the consequences of general curved trajectories in multi-field inflation. After setting up a completely general formalism using the mass basis, which naturally accommodates the notion of light and heavy modes, we study in detail the simple case of two successive turns in two-field system. We find the power spectrum of the curvature perturbation receives corrections that exhibit oscillatory features sinusoidal in the logarithm of the comoving wavenumber without slow-roll suppression. We show that this is because of the resonance of the heavy modes inside and outside the mass horizon.
Cite
@article{arxiv.1506.08894,
title = {Towards general patterns of features in multi-field inflation},
author = {Xian Gao and Jinn-Ouk Gong},
journal= {arXiv preprint arXiv:1506.08894},
year = {2015}
}
Comments
(v1) 16 pages, 2 figures; (v2) 17 pages, minor updates, to appear in Journal of High Energy Physics