skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Isocurvature perturbations and tensor mode in light of Planck and BICEP2

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 r 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 r from Planck alone and BICEP2 results can be consistent at 68 % C.L.

Authors:
;  [1];  [2];  [3]
  1. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582 (Japan)
  2. Helsinki Institute of Physics, University of Helsinki, PO Box 64, FIN-00014 (Finland)
  3. Department of Physics, Saga University, Saga 840-8502 (Japan)
Publication Date:
OSTI Identifier:
22373385
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GRAVITATIONAL WAVES; PERTURBATION THEORY; RELICT RADIATION; SCALARS; TENSORS

Citation Formats

Kawasaki, Masahiro, Yokoyama, Shuichiro, Sekiguchi, Toyokazu, and Takahashi, Tomo, E-mail: kawasaki@icrr.u-tokyo.ac.jp, E-mail: toyokazu.sekiguchi@helsinki.fi, E-mail: tomot@cc.saga-u.ac.jp, E-mail: shu@icrr.u-tokyo.ac.jp. Isocurvature perturbations and tensor mode in light of Planck and BICEP2. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/08/043.
Kawasaki, Masahiro, Yokoyama, Shuichiro, Sekiguchi, Toyokazu, & Takahashi, Tomo, E-mail: kawasaki@icrr.u-tokyo.ac.jp, E-mail: toyokazu.sekiguchi@helsinki.fi, E-mail: tomot@cc.saga-u.ac.jp, E-mail: shu@icrr.u-tokyo.ac.jp. Isocurvature perturbations and tensor mode in light of Planck and BICEP2. United States. doi:10.1088/1475-7516/2014/08/043.
Kawasaki, Masahiro, Yokoyama, Shuichiro, Sekiguchi, Toyokazu, and Takahashi, Tomo, E-mail: kawasaki@icrr.u-tokyo.ac.jp, E-mail: toyokazu.sekiguchi@helsinki.fi, E-mail: tomot@cc.saga-u.ac.jp, E-mail: shu@icrr.u-tokyo.ac.jp. Fri . "Isocurvature perturbations and tensor mode in light of Planck and BICEP2". United States. doi:10.1088/1475-7516/2014/08/043.
@article{osti_22373385,
title = {Isocurvature perturbations and tensor mode in light of Planck and BICEP2},
author = {Kawasaki, Masahiro and Yokoyama, Shuichiro and Sekiguchi, Toyokazu and Takahashi, Tomo, E-mail: kawasaki@icrr.u-tokyo.ac.jp, E-mail: toyokazu.sekiguchi@helsinki.fi, E-mail: tomot@cc.saga-u.ac.jp, E-mail: shu@icrr.u-tokyo.ac.jp},
abstractNote = {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 r 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 r from Planck alone and BICEP2 results can be consistent at 68 % C.L.},
doi = {10.1088/1475-7516/2014/08/043},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2014,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}