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Cosmic Microwave Background Power Asymmetry from Non-Gaussian Modulation

Schmidt, Fabian and Hui, Lam (2013) Cosmic Microwave Background Power Asymmetry from Non-Gaussian Modulation. Physical Review Letters, 110 (1). Art. No. 011301 . ISSN 0031-9007. https://resolver.caltech.edu/CaltechAUTHORS:20130204-135345203

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Abstract

Non-Gaussianity in the inflationary perturbations can couple observable scales to modes of much longer wavelength (even superhorizon), leaving as a signature a large-angle modulation of the observed cosmic microwave background power spectrum. This provides an alternative origin for a power asymmetry that is otherwise often ascribed to a breaking of statistical isotropy. The non-Gaussian modulation effect can be significant even for typical ∼10^(-5) perturbations while respecting current constraints on non-Gaussianity if the squeezed limit of the bispectrum is sufficiently infrared divergent. Just such a strongly infrared-divergent bispectrum has been claimed for inflation models with a non-Bunch-Davies initial state, for instance. Upper limits on the observed cosmic microwave background power asymmetry place stringent constraints on the duration of inflation in such models.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.110.011301 DOIArticle
http://link.aps.org/doi/10.1103/PhysRevLett.110.011301PublisherArticle
Additional Information:© 2013 American Physical Society. Received 15 October 2012; published 2 January 2013; publisher error corrected 23 January 2013. We thank Raphael Flauger, Justin Khoury, Alberto Nicolis, and Albert Stebbins for useful discussions. F. S. was supported by the Moore Foundation at Caltech and the NASA Einstein Fellowship Program at Princeton. L. H. is supported by the DOE and NASA under Cooperative Agreements No. DE-FG02-92-ER40699 and No. NNX10AN14G.
Group:Moore Center for Theoretical Cosmology and Physics
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
NASA Einstein Fellowship ProgramUNSPECIFIED
Department of Energy (DOE)DE-FG02-92-ER40699
NASANNX10AN14G
Issue or Number:1
Classification Code:PACS: 98.70.Vc, 98.65.Dx, 98.80.Cq, 98.80.Es
Record Number:CaltechAUTHORS:20130204-135345203
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130204-135345203
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36765
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Feb 2013 23:25
Last Modified:03 Oct 2019 04:41

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