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Tensor-induced B modes with no temperature fluctuations

Marc Kamionkowski1, Liang Dai1, and Donghui Jeong2,3

  • 1Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA
  • 2Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 3Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

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Phys. Rev. D 89, 107302 – Published 13 May, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.107302

Abstract

The recent indications for a tensor-to-scalar ratio r≃0.2 from BICEP2 measurements of the cosmic microwave background (CMB) B-mode polarization present some tension with upper limits r≲0.1 from measurements of CMB temperature fluctuations. Here we point out that tensor perturbations can induce B modes in the CMB polarization without inducing any temperature fluctuations nor E-mode polarization whatsoever, but only at the expense of violating the Copernican principle. We present this mathematical possibility as a new ingredient for the model-builder’s toolkit in case the tension between B modes and temperature fluctuations cannot be resolved with more conventional ideas.

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References (9)

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Phys. Rev. D 89, 107302– Published 13 May, 2014
  • Received 13 April 2014

© 2014 American Physical Society

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