Isocurvature perturbations and tensor mode in light of Planck and BICEP2
Cosmology and Nongalactic Astrophysics
2014-08-20 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We investigate the degeneracy of the isocurvature perturbations and the primordial gravitational waves, by using recent observations of the cosmic microwave background (CMB) reported by Planck and BICEP2 collaborations. We show that the tension in the bound on the tensor-to-scalar ratio between Planck and BICEP2 can be resolved by introducing the anti-correlated isocurvature perturbations. Quantitatively, we find that with the anti-correlated isocurvature perturbations the constraints on from Planck alone and BICEP2 results can be consistent at 68 % C.L.
Keywords
Cite
@article{arxiv.1404.2175,
title = {Isocurvature perturbations and tensor mode in light of Planck and BICEP2},
author = {Masahiro Kawasaki and Toyokazu Sekiguchi and Tomo Takahashi and Shuichiro Yokoyama},
journal= {arXiv preprint arXiv:1404.2175},
year = {2014}
}
Comments
16 pages, 7 figures, 1 table; accepted for publication in JCAP