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dc.contributor.authorBerges, J.
dc.contributor.authorBoguslavski, Kirill
dc.contributor.authorChatrchyan, A.
dc.contributor.authorJaeckel, J.
dc.date.accessioned2017-11-14T11:11:34Z
dc.date.available2017-11-14T11:11:34Z
dc.date.issued2017
dc.identifier.citationBerges, J., Boguslavski, K., Chatrchyan, A., & Jaeckel, J. (2017). Attractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories. <i>Physical Review D</i>, <i>96</i>(7), Article 076020. <a href="https://doi.org/10.1103/PhysRevD.96.076020" target="_blank">https://doi.org/10.1103/PhysRevD.96.076020</a>
dc.identifier.otherCONVID_27320464
dc.identifier.otherTUTKAID_75524
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/55869
dc.description.abstractWe study the impact of attractive self-interactions on the nonequilibrium dynamics of relativistic quantum fields with large occupancies at low momenta. Our primary focus is on Bose-Einstein condensation and nonthermal fixed points in such systems. For a model system, we consider OðNÞ- symmetric scalar field theories. We use classical-statistical real-time simulations as well as a systematic 1=N expansion of the quantum (two-particle-irreducible) effective action to next-to-leading order. When the mean self-interactions are repulsive, condensation occurs as a consequence of a universal inverse particle cascade to the zero-momentum mode with self-similar scaling behavior. For attractive mean selfinteractions, the inverse cascade is absent, and the particle annihilation rate is enhanced compared to the repulsive case, which counteracts the formation of coherent field configurations. For N ≥ 2, the presence of a nonvanishing conserved charge can suppress number-changing processes and lead to the formation of stable localized charge clumps, i.e., Q balls.
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review D
dc.subject.otheraxions
dc.subject.otherBose-Einstein condensates
dc.titleAttractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201711034134
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2017-11-03T10:15:11Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.relation.issn2470-0010
dc.relation.numberinseries7
dc.relation.volume96
dc.type.versionpublishedVersion
dc.rights.copyright© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.
dc.rights.accesslevelopenAccessfi
dc.relation.doi10.1103/PhysRevD.96.076020


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