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New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons

McAneny, Michael and Ridgway, Alexander K. (2019) New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons. Physical Review D, 100 (4). Art. No. 043534. ISSN 2470-0010. doi:10.1103/PhysRevD.100.043534.

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We study a simple extension of quasi-single field inflation in which the inflaton interacts with multiple extra massive scalars known as isocurvatons. Due to the breaking of time translational invariance by the inflaton background, the theory includes kinetic mixings among the inflaton and isocurvatons. These mixings give rise to novel new features in the primordial non-Gaussianities of the scalar curvature perturbation. A noteworthy feature is that the amplitude of the squeezed bispectrum can grow nearly as (k_s/k_l)^(−3) while oscillating as cosγlog(k_s/k_l), where k_s/k_l is the ratio of the lengths of the short and long wave vectors. Observation of such a shape would provide evidence for the existence of multiple isocurvatons during inflation. In addition, we consider the effects of these non-Gaussianities on large-scale structure.

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Additional Information:© 2019 American Physical Society. Received 8 April 2019; published 22 August 2019. We would like to thank Mark Wise for useful discussions. This work was supported by the DOE Grant No. DE-SC0011632. We are also grateful for the support provided by the Walter Burke Institute for Theoretical Physics.
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0011632
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20190822-100728777
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98103
Deposited By: Tony Diaz
Deposited On:22 Aug 2019 17:16
Last Modified:16 Nov 2021 17:36

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