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Multifield Inflation after Planck: Isocurvature Modes from Nonminimal Couplings
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abstract
Recent measurements by the {\it Planck} experiment of the power spectrum of temperature anisotropies in the cosmic microwave background radiation (CMB) reveal a deficit of power in low multipoles compared to the predictions from best-fit $\Lambda$CDM cosmology. The low-$\ell$ anomaly may be explained by the presence of primordial isocurvature perturbations in addition to the usual adiabatic spectrum, and hence may provide the first robust evidence that early-universe inflation involved more than one scalar field. In this paper we explore the production of isocurvature perturbations in nonminimally coupled two-field inflation. We find that this class of models readily produces enough power in the isocurvature modes to account for the \emph{Planck} low-$\ell$ anomaly, while also providing excellent agreement with the other {\it Planck} results.
Forward citations
Cited by 4 Pith papers
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Precision Unitarity Calculations in Inflationary Models
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Cosmological gravitational particle production in multifield inflation
Negative field-space curvature enhances post-inflationary Ricci scalar oscillations and boosts CGPP dark matter number density by up to an order of magnitude relative to flat field-space cases, with nontrivial relic a...
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Bispectrum BAO and the baryon-dark matter relative velocity
A template-based bispectrum-monopole BAO measurement is shown to be unbiased on simulations and, jointly with the power spectrum, to sharpen BAO constraints while exposing baryon-dark matter velocity biases.
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Canonical Scalar Field Inflation with a Woods-Saxon Potential
A Woods-Saxon (logistic) scalar potential is claimed to produce Planck-compatible inflation and reheating, but the supporting slow-roll equations contain sign and algebra errors.
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