CaltechAUTHORS
  A Caltech Library Service

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. https://resolver.caltech.edu/CaltechAUTHORS:20190822-100728777

[img] PDF - Published Version
See Usage Policy.

683kB
[img] PDF - Submitted Version
See Usage Policy.

2MB

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20190822-100728777

Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevD.100.043534DOIArticle
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.100.043534PublisherArticle
https://arxiv.org/abs/1903.11607arXivDiscussion Paper
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
Funders:
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
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190822-100728777
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98103
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Aug 2019 17:16
Last Modified:03 Oct 2019 21:38

Repository Staff Only: item control page