Multifield Inflation after Planck: The Case for Nonminimal Couplings
Name
PhysRevLett.112.011302.pdf
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300.22 KB
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Adobe PDF
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Author(s)
Kaiser, David I.
Sfakianakis, Evangelos
Date Issued
January 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Kaiser, David I., and Evangelos I. Sfakianakis. “Multifield Inflation after Planck: The Case for Nonminimal Couplings.” Physical Review Letters 112.1 (2014): n. pag. © 2014 American Physical Society
Version
Final published version
Abstract
Multifield models of inflation with nonminimal couplings are in excellent agreement with the recent results from Planck. Across a broad range of couplings and initial conditions, such models evolve along an effectively single-field attractor solution and predict values of the primordial spectral index and its running, the tensor-to-scalar ratio, and non-Gaussianities squarely in the observationally most-favored region. Such models can also amplify isocurvature perturbations, which could account for the low power recently observed in the cosmic microwave background power spectrum at low multipoles. Future measurements of primordial isocurvature perturbations could distinguish between the currently viable possibilities.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Program in Science, Technology and Society
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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/PhysRevLett.112.011302
