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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1304.0363 (astro-ph)
[Submitted on 1 Apr 2013 (v1), last revised 7 Jan 2014 (this version, v3)]

Title:Multifield Inflation after Planck: The Case for Nonminimal Couplings

Authors:David I. Kaiser, Evangelos I. Sfakianakis
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Abstract:Multifield models of inflation with nonminimal couplings are in excellent agreement with the recent results from {\it 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 also can amplify isocurvature perturbations, which could account for the low power recently observed in the CMB power spectrum at low multipoles. Future measurements of primordial isocurvature perturbations and the tensor-to-scalar ratio may serve to distinguish between the currently viable possibilities.
Comments: 13 pages, 4 figures. Minor changes to match published version
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Report number: Preprint MIT-CTP 4451
Cite as: arXiv:1304.0363 [astro-ph.CO]
  (or arXiv:1304.0363v3 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1304.0363
Journal reference: Phys. Rev. Lett. 112 (2014): 011302
Related DOI: https://doi.org/10.1103/PhysRevLett.112.011302

Submission history

From: David Kaiser [view email]
[v1] Mon, 1 Apr 2013 14:29:46 UTC (268 KB)
[v2] Fri, 12 Apr 2013 01:53:17 UTC (267 KB)
[v3] Tue, 7 Jan 2014 20:30:39 UTC (269 KB)
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