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K-essence model from the mechanical approach point of view: coupled scalar field and the late cosmic acceleration

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dc.contributor.authorBouhmadi Lopez, Mariam
dc.contributor.authorKumar, K. Sravan
dc.contributor.authorMarto, João
dc.contributor.authorMorais, João
dc.contributor.authorZhuk, Alexander
dc.date.accessioned2018-11-26T16:09:41Z
dc.date.available2018-11-26T16:09:41Z
dc.date.issued2016
dc.description.abstractIn this paper, we consider the Universe at the late stage of its evolution and deep inside the cell of uniformity. At these scales, we can consider the Universe to be filled with dust-like matter in the form of discretely distributed galaxies, a K-essence scalar field, playing the role of dark energy, and radiation as matter sources. We investigate such a Universe in the mechanical approach. This means that the peculiar velocities of the inhomogeneities (in the form of galaxies) as well as the fluctuations of the other perfect fluids are non-relativistic. Such fluids are designated as coupled because they are concentrated around the inhomogeneities. In the present paper, we investigate the conditions under which the K-essence scalar field with the most general form for its action can become coupled. We investigate at the background level three particular examples of the K-essence models: (i) the pure kinetic K-essence field, (ii) a K-essence with a constant speed of sound and (iii) the K-essence model with the Lagrangian bX+cX2−V(phi). We demonstrate that if the K-essence is coupled, all these K-essence models take the form of multicomponent perfect fluids where one of the component is the cosmological constant. Therefore, they can provide the late-time cosmic acceleration and be simultaneously compatible with the mechanical approach.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMariam Bouhmadi-López et al JCAP07(2016)050pt_PT
dc.identifier.doi10.1088/1475-7516/2016/07/050pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/6502
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherIOP Publishingpt_PT
dc.relation.publisherversionhttps://doi.org/10.1088/1475-7516/2016/07/050pt_PT
dc.subjectLate time cosmologypt_PT
dc.subjectDark energypt_PT
dc.titleK-essence model from the mechanical approach point of view: coupled scalar field and the late cosmic accelerationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMAT%2F00212%2F2013/PT
oaire.citation.issue07pt_PT
oaire.citation.titleJournal of Cosmology and Astroparticle Physicspt_PT
oaire.citation.volume2016pt_PT
oaire.fundingStream5876
person.familyNameBouhmadi Lopez
person.familyNameKUMAR
person.familyNamePedro de Jesus Marto
person.familyNameMorais
person.familyNameZhuk
person.givenNameMariam
person.givenNameK. SRAVAN
person.givenNameJoão
person.givenNameJoão
person.givenNameAlexander
person.identifier.ciencia-idCF1F-8611-C989
person.identifier.ciencia-id5014-F2B1-1CEC
person.identifier.ciencia-id2F16-67B1-A930
person.identifier.orcid0000-0002-1529-1889
person.identifier.orcid0000-0002-3126-8195
person.identifier.orcid0000-0003-3974-9177
person.identifier.orcid0000-0001-5090-8015
person.identifier.orcid0000-0001-9107-5048
person.identifier.scopus-author-id6508339470
person.identifier.scopus-author-id56896293800
person.identifier.scopus-author-id55756497200
person.identifier.scopus-author-id56223076300
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.embargofctCopyright cedido à editora no momento da publicaçãopt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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