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Multifield Inflation after Planck: The Case for Nonminimal Couplings · Around

2013

Multifield Inflation after Planck: The Case for Nonminimal Couplings

Kaiser, David I., Sfakianakis, Evangelos I.

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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.

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2010

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F. Bezrukov, D. Gorbunov, and M. Shaposhnikov, “On initial conditions for the hot big bang,” JCAP 0906 (2009): 029 [arXiv:0812.3622 [hep-ph]]; J. García-Bellido, D. G. Figueroa, and J. Rubio, “Preheating in the Standard Model with the Higgs-inflaton coupled to gravity,” Phys. Rev. D 79 (2009): 063531 [arXiv:0812.4624 [hep-ph]]; J.-F. Dufaux, D. G. Figueroa, and J. García-Bellido, “Gravitational waves from Abelian gauge fields and cosmic strings at preheating,” Phys. Rev. D 82 (2010): 083518 [arXiv:1006.0217 [astro-ph.CO]]

2010

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S. Mooij and M. Postma, “Goldstone bosons and a dynamical Higgs field,” JCAP 1109 (2011): 006 [arXiv:1104.4897 [hep-ph]]

2011

Cited alongside, same era.

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2011

Cited alongside, same era.

WMAP collaboration, “Nine-year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Cosmological parameter results,” arXiv:1212.5226 [astro-ph.CO]

Cited in the paper.

R. Easther and L. C. Price, “Initial conditions and sampling for multifield inflation,” arXiv:1304.4244 [astro-ph.CO]

Cited in the paper.

There has been vigorous debate over whether such models with ξ I ≫ 1 \xi_{I}\gg 1 violate unitarity (see Refs. 12, 14, 15, 24, and 25 of GKS ). However, the constraint H ⁡ ( t ∗ ) / M pl < 10 − 5 H(t_{*})/M_{\rm pl}<10^{-5} means that the unitarity cutoff scale Λ ≫ H \Lambda\gg H during inflation, and hence for the domain of interest we may rely on the classical background dynamics as analyzed here

Cited in the paper.

K. Schutz, E. I. Sfakianakis, and D. I. Kaiser, “Multifield inflation after Planck

Cited in the paper.

In the case of Higgs inflation, in which the inflaton has no couplings other than to Standard Model particles, some as-yet unknown mechanism would be required to preserve primordial isocurvature perturbations through reheating. Primordial isocurvature perturbations could more readily survive reheating in symmetric-coupling models if the inflaton coupled to some non-Standard Model particles, such as cold dark matter particles

Cited in the paper.

2013

Closest in time.

R. N. Greenwood, D. I. Kaiser, and E. I. Sfakianakis, “Multifield dynamics of Higgs inflation,” Phys. Rev. D87 (2013): 064021 [arXiv:1210.8190 [hep-ph]]

2013

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R. Kallosh and A. Linde, “Non-minimal inflationary attractors,” arXiv:1307.7938 [hep-th]; R. Kallosh and A. Linde, “Multi-field conformal cosmological attractors,” arXiv:1309.2015 [hep-th]; R. Kallosh, A. Linde, and D. Roest, “A universal attractor for inflation at strong coupling,” arXiv:1310.3950 [hep-th]; R. Kallosh, A. Linde, and D. Roest, “Superconformal inflationary α \alpha -attractors,” arXiv:1311.0472 [hep-th]

2015

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