Blue running of the primordial tensor spectrum
Cosmology and Nongalactic Astrophysics
2015-06-19 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We examine the possibility of positive spectral index of the power spectrum of the primordial tensor perturbation produced during inflation in the light of the detection of the B-mode polarization by the BICEP2 collaboration. We find a blue tilt is in general possible when the slow-roll parameter decays rapidly. We present two known examples in which a positive spectral index for the tensor power spectrum can be obtained. We also briefly discuss other consistency tests for further studies on inflationary dynamics.
Keywords
Cite
@article{arxiv.1403.5163,
title = {Blue running of the primordial tensor spectrum},
author = {Jinn-Ouk Gong},
journal= {arXiv preprint arXiv:1403.5163},
year = {2015}
}
Comments
(v1) 6 pages; (v2) 7 pages, more discussions and changes including the title, to appear in Journal of Cosmology and Astroparticle Physics