TY  - JOUR
AU  - Melville, Scott
AU  - Lerner, Rose
TI  - Quantifying the `naturalness' of the curvaton model
JO  - Journal of cosmology and astroparticle physics
VL  - 2014
IS  - 07
SN  - 1475-7516
CY  - London
PB  - IOP
M1  - PUBDB-2014-04084
M1  - DESY-14-015
M1  - arXiv:1402.3176
SP  - 026
PY  - 2014
N1  - (c) IOP Publishing Ltd and Sissa Medialab srl
AB  - We investigate the probability of obtaining an observable curvature perturbation, using as an example the minimal curvaton-higgs (MCH) model. We determine "probably observable" and "probably excluded" regions of parameter space assuming generic initial conditions and applying a stochastic approach for the curvaton's evolution during inflation. Inflation is assumed to last longer than the N(obs) simeq 55 observable e-folds, and the total number of e-folds of inflation determines the particular ranges of parameters that are probable. For the MCH model, these "probably observable" regions always lie within the range 8 × 10(4) GeV ≤ m(σ) ≤ 2 × 10(7) GeV, where m(σ) is the curvaton mass, and the Hubble scale at horizon exit is chosen as H(*) = 10(10) GeV. Because the "probably observable" region depends on the total duration of inflation, information on parameters in the Lagrangian from particle physics and from precision CMB observations can therefore provide information about the total duration of inflation, not just the last N(obs) e-folds. This method could also be applied to any model that contains additional scalar fields to determine the probability that these scalar fields contribute to the curvature perturbation.
KW  - curvature: perturbation (INSPIRE)
KW  - field theory: scalar (INSPIRE)
KW  - curvaton: mass (INSPIRE)
KW  - inflation (INSPIRE)
KW  - cosmic background radiation (INSPIRE)
KW  - boundary condition (INSPIRE)
KW  - stochastic (INSPIRE)
KW  - horizon (INSPIRE)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000339802700027
DO  - DOI:10.1088/1475-7516/2014/07/026
UR  - https://bib-pubdb1.desy.de/record/192487
ER  -