New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons
Abstract
Here, 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 while oscillating as , where 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. Furthermore, we consider the effects of these non-Gaussianities on large-scale structure.
- Authors:
-
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Walter Burke Inst. for Theoretical Physics
- Publication Date:
- Research Org.:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1599365
- Alternate Identifier(s):
- OSTI ID: 1558687
- Grant/Contract Number:
- SC0011632
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 4; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
McAneny, Michael, and Ridgway, Alexander K. New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.100.043534.
McAneny, Michael, & Ridgway, Alexander K. New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons. United States. https://doi.org/10.1103/PhysRevD.100.043534
McAneny, Michael, and Ridgway, Alexander K. Thu .
"New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons". United States. https://doi.org/10.1103/PhysRevD.100.043534. https://www.osti.gov/servlets/purl/1599365.
@article{osti_1599365,
title = {New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons},
author = {McAneny, Michael and Ridgway, Alexander K.},
abstractNote = {Here, 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 (ks/kl)-3 while oscillating as cosγlog(ks/kl), where ks/kl 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. Furthermore, we consider the effects of these non-Gaussianities on large-scale structure.},
doi = {10.1103/PhysRevD.100.043534},
journal = {Physical Review D},
number = 4,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}
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