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dc.contributor.authorDias, Mafaldaen
dc.contributor.authorFrazer, Jonathanen
dc.contributor.authorMarsh, Daviden
dc.date.accessioned2018-06-26T10:41:56Z
dc.date.available2018-06-26T10:41:56Z
dc.date.issued2018-01en
dc.identifier.issn1475-7516
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/277515
dc.description.abstractWe study inflation in models with many interacting fields subject to randomly generated scalar potentials. We use methods from non-equilibrium random matrix theory to construct the potentials and an adaption of the ‘transport method’ to evolve the two-point correlators during inflation. This construction allows, for the first time, for an explicit study of models with up to 100 interacting fields supporting a period of ‘approximately saddle-point’ inflation. We determine the statistical predictions for observables by generating over 30,000 models with 2–100 fields supporting at least 60 efolds of inflation. These studies lead us to seven lessons: i) Manyfield inflation is not single-field inflation, ii) The larger the number of fields, the simpler and sharper the predictions, iii) Planck compatibility is not rare, but future experiments may rule out this class of models, iv) The smoother the potentials, the sharper the predictions, v) Hyperparameters can transition from stiff to sloppy, vi) Despite tachyons, isocurvature can decay, vii) Eigenvalue repulsion drives the predictions. We conclude that many of the ‘generic predictions’ of single-field inflation can be emergent features of complex inflation models.
dc.publisherIoP
dc.subjectinflationen
dc.subjectphysics of the early universeen
dc.subjectstring theory and cosmologyen
dc.titleSeven lessons from manyfield inflation in random potentialsen
dc.typeArticle
prism.issueIdentifier1en
prism.numberARTN 036en
prism.publicationDate2018en
prism.publicationNameJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICSen
dc.identifier.doi10.17863/CAM.24831
dcterms.dateAccepted2018-01-08en
rioxxterms.versionofrecord10.1088/1475-7516/2018/01/036en
rioxxterms.versionAM*
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-01en
dc.contributor.orcidMarsh, David [0000-0001-7271-4115]
dc.identifier.eissn1475-7516
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEuropean Research Council (279617)
pubs.funder-project-idSTFC (ST/P000673/1)
pubs.funder-project-idSTFC (ST/L000636/1)
rioxxterms.freetoread.startdate2019-01-22


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