Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/08/043
Keywords
cosmological parameters from CMBR; physics of the early universe; inflation; gravitational waves and CMBR polarization
Funding
- Ministry of Education, Culture, Sports, Science and Technology in Japan [25400248, 23740195, 24-2775, 21111006]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Academy of Finland [1263714]
- Grants-in-Aid for Scientific Research [23740195] Funding Source: KAKEN
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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 isocurvaturo 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.
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