CMB B -mode non-Gaussianity
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Authors
Meerburg, Pieter Daniel
Meyers, J
Van Engelen, A
Ali-Haïmoud, Y
Publication Date
2016-06-07Journal Title
Physical Review D
ISSN
2470-0010
Publisher
APS
Volume
93
Issue
12
Type
Article
Metadata
Show full item recordCitation
Meerburg, P. D., Meyers, J., Van Engelen, A., & Ali-Haïmoud, Y. (2016). CMB B -mode non-Gaussianity. Physical Review D, 93 (12) 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 bispectrumr. 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.
Identifiers
External DOI: https://doi.org/10.1103/PhysRevD.93.123511
This record's URL: https://www.repository.cam.ac.uk/handle/1810/285501
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