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Improved dynamics and gravitational collapse of tachyon field coupled with a barotropic fluid

dc.contributor.authorMarto, João
dc.contributor.authorTavakoli, Yaser
dc.contributor.authorMoniz, Paulo
dc.date.accessioned2018-11-26T15:54:22Z
dc.date.available2018-11-26T15:54:22Z
dc.date.issued2013-08-22
dc.description.abstractWe consider a spherically symmetric gravitational collapse of a tachyon field with an inverse square potential, which is coupled with a barotropic fluid. By employing an holonomy correction imported from loop quantum cosmology, we analyse the dynamics of the collapse within a semiclassical description. Using a dynamical system approach, we find that the stable fixed points given by the standard general relativistic setting turn into saddle points in the present context. This provides a new dynamics in contrast to the black hole and naked singularities solutions appearing in the classical model. Our results suggest that classical singularities can be avoided by quantum gravity effects and are replaced by a bounce. By a thorough numerical studies we show that, depending on the barotropic parameter $\gamma$, there exists a class of solutions corresponding to either a fluid or a tachyon dominated regimes. Furthermore, for the case $\gamma \sim 1$, we find an interesting tracking behaviour between the tachyon and the fluid leading to a dust-like collapse. In addition, we show that, there exists a threshold scale which determines when an outward energy flux emerges, as a non-singular black hole is forming, at the corresponding collapse final stages.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1142/S021827181550025Xpt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/6499
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWorld Scientific Publishingpt_PT
dc.relation.publisherversionhttps://doi.org/10.1142/S021827181550025Xpt_PT
dc.subjectLoop quantum cosmologypt_PT
dc.subjectGravitational collapsept_PT
dc.titleImproved dynamics and gravitational collapse of tachyon field coupled with a barotropic fluidpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/COMPETE/CERN%2FFP%2F123609%2F2011/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDTI/CERN%2FFP%2F123618%2F2011/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/PEst-OE%2FMAT%2FUI0212%2F2014/PT
oaire.citation.issue03pt_PT
oaire.citation.startPage1550025pt_PT
oaire.citation.titleInternational Journal of Modern Physics Dpt_PT
oaire.citation.volume24pt_PT
oaire.fundingStreamCOMPETE
oaire.fundingStream3599-PPCDTI
oaire.fundingStream5876
person.familyNamePedro de Jesus Marto
person.familyNameTavakoli
person.familyNameMoniz
person.givenNameJoão
person.givenNameYaser
person.givenNamePaulo
person.identifierhttps://scholar.google.com/citations?user=kA-uFTYAAAAJ&hl=en
person.identifier277693
person.identifier.ciencia-id2F16-67B1-A930
person.identifier.ciencia-id9812-C08C-3084
person.identifier.ciencia-idB410-D0B7-55C1
person.identifier.orcid0000-0003-3974-9177
person.identifier.orcid0000-0003-0099-5100
person.identifier.orcid0000-0001-7170-8952
person.identifier.ridM-9845-2013
person.identifier.scopus-author-id6701832578
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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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