Anomalous dimensions and non-gaussianity
Abstract
Here, we analyze the signatures of inflationary models that are coupled to interacting field theories, a basic class of multifield models also motivated by their role in providing dynamically small scales. Near the squeezed limit of the bispectrum, we find a simple scaling behavior determined by operator dimensions, which are constrained by the appropriate unitarity bounds. Specifically, we analyze two simple and calculable classes of examples: conformal field theories (CFTs), and large-N CFTs deformed by relevant time-dependent double-trace operators. Together these two classes of examples exhibit a wide range of scalings and shapes of the bispectrum, including nearly equilateral, orthogonal and local non-Gaussianity in different regimes. Along the way, we compare and contrast the shape and amplitude with previous results on weakly coupled fields coupled to inflation. This signature provides a precision test for strongly coupled sectors coupled to inflation via irrelevant operators suppressed by a high mass scale up to ~ 103 times the inflationary Hubble scale.
- Authors:
-
- Stanford Univ., Stanford, CA (United States); Kavli Institute for Particle Astrophysics and Cosmology, Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Kavli Institute for Particle Astrophysics and Cosmology, Stanford, CA (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Kavli Institute for Particle Astrophysics and Cosmology, Stanford, CA (United States)
- Institute for Advanced Study, Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1491071
- Grant/Contract Number:
- SC0008078
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2013; Journal Issue: 10; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Cosmology of Theories beyond the SM; Conformal and W Symmetry
Citation Formats
Green, Daniel, Lewandowski, Matthew, Senatore, Leonardo, Silverstein, Eva, and Zaldarriaga, Matias. Anomalous dimensions and non-gaussianity. United States: N. p., 2013.
Web. doi:10.1007/JHEP10(2013)171.
Green, Daniel, Lewandowski, Matthew, Senatore, Leonardo, Silverstein, Eva, & Zaldarriaga, Matias. Anomalous dimensions and non-gaussianity. United States. https://doi.org/10.1007/JHEP10(2013)171
Green, Daniel, Lewandowski, Matthew, Senatore, Leonardo, Silverstein, Eva, and Zaldarriaga, Matias. Fri .
"Anomalous dimensions and non-gaussianity". United States. https://doi.org/10.1007/JHEP10(2013)171. https://www.osti.gov/servlets/purl/1491071.
@article{osti_1491071,
title = {Anomalous dimensions and non-gaussianity},
author = {Green, Daniel and Lewandowski, Matthew and Senatore, Leonardo and Silverstein, Eva and Zaldarriaga, Matias},
abstractNote = {Here, we analyze the signatures of inflationary models that are coupled to interacting field theories, a basic class of multifield models also motivated by their role in providing dynamically small scales. Near the squeezed limit of the bispectrum, we find a simple scaling behavior determined by operator dimensions, which are constrained by the appropriate unitarity bounds. Specifically, we analyze two simple and calculable classes of examples: conformal field theories (CFTs), and large-N CFTs deformed by relevant time-dependent double-trace operators. Together these two classes of examples exhibit a wide range of scalings and shapes of the bispectrum, including nearly equilateral, orthogonal and local non-Gaussianity in different regimes. Along the way, we compare and contrast the shape and amplitude with previous results on weakly coupled fields coupled to inflation. This signature provides a precision test for strongly coupled sectors coupled to inflation via irrelevant operators suppressed by a high mass scale up to ~ 103 times the inflationary Hubble scale.},
doi = {10.1007/JHEP10(2013)171},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2013,
place = {United States},
year = {Fri Oct 25 00:00:00 EDT 2013},
month = {Fri Oct 25 00:00:00 EDT 2013}
}
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