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CMB B-mode non-Gaussianity

P. Daniel Meerburg1,*, Joel Meyers1,†, Alexander van Engelen1,‡, and Yacine Ali-Haïmoud2,§

  • 1CITA, University of Toronto, 60 St. George Street, Toronto, Canada
  • 2Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA

  • *meerburg@cita.utoronto.ca
  • †jmeyers@cita.utoronto.ca
  • ‡engelen@cita.utoronto.ca
  • §yacine@jhu.edu
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Phys. Rev. D 93, 123511 – Published 7 June, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.123511

Abstract

We study the degree to which the cosmic microwave background (CMB) can be used to constrain primordial non-Gaussianity involving one tensor and two scalar fluctuations, focusing on the correlation of one polarization B mode with two temperature modes. In the simplest models of inflation, the tensor-scalar-scalar primordial bispectrum is nonvanishing and is of the same order in slow-roll parameters as the scalar-scalar-scalar bispectrum. We calculate the ⟨BTT⟩ correlation arising from a primordial tensor-scalar-scalar bispectrum, and show that constraints from an experiment like CMB-Stage IV using this observable are more than an order of magnitude better than those on the same primordial coupling obtained from temperature measurements alone. We argue that B-mode non-Gaussianity opens up an as-yet-unexplored window into the early Universe, demonstrating that significant information on primordial physics remains to be harvested from CMB anisotropies.

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Phys. Rev. D 93, 123511– Published 7 June, 2016
  • Received 19 April 2016

© 2016 American Physical Society

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