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dc.contributor.authorBains, Jasdeep S
dc.contributor.authorHertzberg, Mark P
dc.contributor.authorWilczek, Frank
dc.date.accessioned2021-10-27T19:51:55Z
dc.date.available2021-10-27T19:51:55Z
dc.date.issued2017
dc.identifier.urihttps://hdl.handle.net/1721.1/133284
dc.description.abstract© 2017 IOP Publishing Ltd and Sissa Medialab srl. In expanding FRW spacetimes, it is usually the case that homogeneous scalar fields redshift and their amplitudes approach limiting values: Hubble friction usually ensures that the field relaxes to its minimum energy configuration, which is usually a static configuration. Here we discover a class of relativistic scalar field models in which the attractor behavior is the field oscillating indefinitely, with finite amplitude, in an expanding FRW spacetime, despite the presence of Hubble friction. This is an example of spontaneous breaking of time translation symmetry. We find that the effective equation of state of the field has average value ( w)=-1, implying that the field itself could drive an inflationary or dark energy dominated phase. This behavior is reminiscent of ghost condensate models, but in the new models, unlike in the ghost condensate models, the energy-momentum tensor is time dependent, so that these new models embody a more definitive breaking of time translation symmetry. We explore (quantum) fluctuations around the homogeneous background solution, and find that low k-modes can be stable, while high k-modes are typically unstable. We discuss possible interpretations and implications of that instability.
dc.language.isoen
dc.publisherIOP Publishing
dc.relation.isversionof10.1088/1475-7516/2017/05/011
dc.rightsCreative Commons Attribution-Noncommercial-Share Alike
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.sourcearXiv
dc.titleOscillatory attractors: a new cosmological phase
dc.typeArticle
dc.relation.journalJournal of Cosmology and Astroparticle Physics
dc.eprint.versionAuthor's final manuscript
dc.type.urihttp://purl.org/eprint/type/JournalArticle
eprint.statushttp://purl.org/eprint/status/PeerReviewed
dc.date.updated2019-04-19T13:13:33Z
dspace.orderedauthorsBains, JS; Hertzberg, MP; Wilczek, F
dspace.date.submission2019-04-19T13:13:34Z
mit.journal.volume2017
mit.journal.issue05
mit.metadata.statusAuthority Work and Publication Information Needed


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