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dc.contributor.authorKainulainen, Kimmo
dc.contributor.authorKoskivaara, Olli
dc.date.accessioned2022-01-11T09:29:11Z
dc.date.available2022-01-11T09:29:11Z
dc.date.issued2021
dc.identifier.citationKainulainen, K., & Koskivaara, O. (2021). Non-equilibrium dynamics of a scalar field with quantum backreaction. <i>Journal of High Energy Physics</i>, <i>2021</i>(12), Article 190. <a href="https://doi.org/10.1007/jhep12(2021)190" target="_blank">https://doi.org/10.1007/jhep12(2021)190</a>
dc.identifier.otherCONVID_103531247
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/79284
dc.description.abstractWe study the dynamical evolution of coupled one- and two-point functions of a scalar field in the 2PI framework at the Hartree approximation, including backreaction from out-of-equilibrium modes. We renormalize the 2PI equations of motion in an on-shell scheme in terms of physical parameters. We present the Hartree-resummed renormalized effective potential at finite temperature and critically discuss the role of the effective potential in a non-equilibrium system. We follow the decay and thermalization of a scalar field from an initial cold state with all energy stored in the potential, into a fully thermalized system with a finite temperature. We identify the non-perturbative processes of parametric resonance and spinodal instability taking place during the reheating stage. In particular we study the unstable modes in the region where the vacuum 1PI effective action becomes complex and show that such spinodal modes can have a dramatic effect on the evolution of the one-point function. Our methods can be easily adapted to simulate reheating at the end of inflation.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofseriesJournal of High Energy Physics
dc.rightsCC BY 4.0
dc.subject.othernonperturbative effects
dc.subject.otherthermal field theory
dc.subject.otherquantum dissipative systems
dc.titleNon-equilibrium dynamics of a scalar field with quantum backreaction
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202201111062
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.relation.issn1126-6708
dc.relation.numberinseries12
dc.relation.volume2021
dc.type.versionpublishedVersion
dc.rights.copyright© The Authors. Article funded by SCOAP3
dc.rights.accesslevelopenAccessfi
dc.relation.grantnumber318319
dc.subject.ysohiukkasfysiikka
dc.subject.ysokvanttikenttäteoria
dc.subject.ysokosmologia
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p15576
jyx.subject.urihttp://www.yso.fi/onto/yso/p27496
jyx.subject.urihttp://www.yso.fi/onto/yso/p7160
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1007/jhep12(2021)190
dc.relation.funderResearch Council of Finlanden
dc.relation.funderSuomen Akatemiafi
jyx.fundingprogramAcademy Project, AoFen
jyx.fundingprogramAkatemiahanke, SAfi
jyx.fundinginformationThis work was supported by the Academy of Finland grant 318319. OK was in addition supported by a grant from the Magnus Ehrnrooth Foundation.
dc.type.okmA1


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