The best inflationary models after Planck
File(s)1312.3529v3.pdf (1.48 MB)
Accepted version
Author(s)
Martin, J
Ringeval, C
Trotta, R
Vennin, V
Type
Journal Article
Abstract
We compute the Bayesian evidence and complexity of 193 slow-roll single-field models of inflation using the Planck 2013 Cosmic Microwave Background data, with the aim of establishing which models are favoured from a Bayesian perspective. Our calculations employ a new numerical pipeline interfacing an inflationary effective likelihood with the slow-roll library ASPIC and the nested sampling algorithm MultiNest. The models considered represent a complete and systematic scan of the entire landscape of inflationary scenarios proposed so far. Our analysis singles out the most probable models (from an Occam's razor point of view) that are compatible with Planck data, while ruling out with very strong evidence 34% of the models considered. We identify 26% of the models that are favoured by the Bayesian evidence, corresponding to 15 different potential shapes. If the Bayesian complexity is included in the analysis, only 9% of the models are preferred, corresponding to only 9 different potential shapes. These shapes are all of the plateau type.
Date Issued
2014-03-19
Date Acceptance
2014-02-18
Citation
Journal of Cosmology and Astroparticle Physics, 2014, 2014 (1)
ISSN
1475-7516
Publisher
IOP Publishing
Journal / Book Title
Journal of Cosmology and Astroparticle Physics
Volume
2014
Issue
1
Copyright Statement
©2014 IOP Publishing Ltd.
Sponsor
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council [2006-2012]
Grant Number
ST/K001051/1
ST/K001051/1
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
inflation
CMBR experiments
physics of the early universe
cosmological parameters from CMBR
BAYESIAN-INFERENCE
EFFICIENT
COSMOLOGY
SELECTION
Publication Status
Published
Article Number
ARTN 039