Primordial bispectrum from multifield inflation with nonminimal couplings
Name
Kaiser-2013-Primordial bispectrum from multifield inflation with nonminimal couplings.pdf
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2.11 MB
Format
Adobe PDF
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Author(s)
Kaiser, David I.
Mazenc, Edward A.
Sfakianakis, Evangelos
Date Issued
March 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Kaiser, David I., Edward A. Mazenc, and Evangelos I. Sfakianakis. “Primordial Bispectrum from Multifield Inflation with Nonminimal Couplings.” Physical Review D 87.6 (2013). © 2013 American Physical Society
Version
Final published version
Abstract
Realistic models of high-energy physics include multiple scalar fields. Renormalization requires that the fields have nonminimal couplings to the spacetime Ricci curvature scalar, and the couplings can be large at the energy scales of early-universe inflation. The nonminimal couplings induce a nontrivial field-space manifold in the Einstein frame, and they also yield an effective potential in the Einstein frame with nontrivial curvature. The ridges or bumps in the Einstein-frame potential can lead to primordial non-Gaussianities of observable magnitude. We develop a covariant formalism to study perturbations in such models and calculate the primordial bispectrum. As in previous studies of non-Gaussianities in multifield models, our results for the bispectrum depend sensitively on the fields’ initial conditions.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.87.064004
