Multifield Inflation after Planck: The Case for Nonminimal Couplings - INSPIRE

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Multifield Inflation after Planck: The Case for Nonminimal Couplings

David I. Kaiser
(
- MIT
)
,
Evangelos I. Sfakianakis
(
- MIT
)

Apr 1, 2013

5 pages

Published in:

Phys.Rev.Lett. 112 (2014) 1, 011302

Published: Jan 7, 2014

e-Print:

1304.0363 [astro-ph.CO]

DOI:

10.1103/PhysRevLett.112.011302

Report number:

PREPRINT-MIT-CTP-4451

View in:

ADS Abstract Service

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Abstract: (APS)

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.

Note:

13 pages, 4 figures. Minor changes to match published version

98.80.Cq
isocurvature: perturbation
coupling: nonminimal
power spectrum: primordial
inflation: model
cosmic background radiation: power spectrum
satellite: Planck
boundary condition
non-Gaussianity
multipole

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