publication . Preprint . Article . 2014

Simple predictions from multifield inflationary models

Richard Easther; Jonathan Frazer; Hiranya V. Peiris; Layne C. Price;
Open Access English
  • Published: 22 Apr 2014
Abstract
We explore whether multifield inflationary models make unambiguous predictions for fundamental cosmological observables. Focusing on $N$-quadratic inflation, we numerically evaluate the full perturbation equations for models with 2, 3, and $\mathcal{O}(100)$ fields, using several distinct methods for specifying the initial values of the background fields. All scenarios are highly predictive, with the probability distribution functions of the cosmological observables becoming more sharply peaked as $N$ increases. For $N=100$ fields, 95% of our Monte Carlo samples fall in the ranges $n_s \in (0.9455,0.9534)$; $\alpha \in (-9.741,-7.047)\times 10^{-4}$; $r\in(0.144...
Persistent Identifiers
Subjects
arXiv: Astrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Theory, General Physics and Astronomy, Spectral density, Boundary value problem, Amplitude, Physics, Perturbation (astronomy), Observable, Theoretical physics, Inflation, media_common.quotation_subject, media_common, Distribution function, Probability distribution
Funded by
EC| COSMICDAWN
Project
COSMICDAWN
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
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