Constraining scalar-tensor quintessence by cosmic clocks

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dc.contributor.authorCapozziello, S
dc.contributor.authorDunsby, P K S
dc.contributor.authorPiedipalumbo, E
dc.contributor.authorRubano, C
dc.date.accessioned2021-10-08T11:01:03Z
dc.date.available2021-10-08T11:01:03Z
dc.date.issued2007
dc.description.abstractAims. We study scalar tensor theories of gravity with power law scalar field potentials as cosmological models for accelerating universe, using cosmic clocks. Methods. Scalar-tensor quintessence models can be constrained by identifying suitable cosmic clocks which allow one to select confidence regions for cosmological parameters. In particular, we constrain the characterizing parameters of non-minimally coupled scalar-tensor cosmological models which admit exact solutions of the Einstein field equations. Lookback time to galaxy clusters at low intermediate, and high redshifts is considered. The high redshift time-scale problem is also discussed in order to select other cosmic clocks such as quasars. Results. The presented models seem to work in all the regimes considered: the main feature of this approach is the fact that cosmic clocks are completely independent of each other, so that, in principle, it is possible to avoid bias due to primary, secondary and so on indicators in the cosmic distance ladder. Conclusions. We have used different methods to test cosmological models at low, intermediate and high redshift by different indicators: this seems to confirm independently these proposed dark energy models.
dc.identifier.apacitationCapozziello, S., Dunsby, P. K. S., Piedipalumbo, E., & Rubano, C. (2007). Constraining scalar-tensor quintessence by cosmic clocks. <i>Astronomy and Astrophysics</i>, 472(1), 51 - 62. http://hdl.handle.net/11427/35073en_ZA
dc.identifier.chicagocitationCapozziello, S, P K S Dunsby, E Piedipalumbo, and C Rubano "Constraining scalar-tensor quintessence by cosmic clocks." <i>Astronomy and Astrophysics</i> 472, 1. (2007): 51 - 62. http://hdl.handle.net/11427/35073en_ZA
dc.identifier.citationCapozziello, S., Dunsby, P.K.S., Piedipalumbo, E. & Rubano, C. 2007. Constraining scalar-tensor quintessence by cosmic clocks. <i>Astronomy and Astrophysics.</i> 472(1):51 - 62. http://hdl.handle.net/11427/35073en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article AU - Capozziello, S AU - Dunsby, P K S AU - Piedipalumbo, E AU - Rubano, C AB - Aims. We study scalar tensor theories of gravity with power law scalar field potentials as cosmological models for accelerating universe, using cosmic clocks. Methods. Scalar-tensor quintessence models can be constrained by identifying suitable cosmic clocks which allow one to select confidence regions for cosmological parameters. In particular, we constrain the characterizing parameters of non-minimally coupled scalar-tensor cosmological models which admit exact solutions of the Einstein field equations. Lookback time to galaxy clusters at low intermediate, and high redshifts is considered. The high redshift time-scale problem is also discussed in order to select other cosmic clocks such as quasars. Results. The presented models seem to work in all the regimes considered: the main feature of this approach is the fact that cosmic clocks are completely independent of each other, so that, in principle, it is possible to avoid bias due to primary, secondary and so on indicators in the cosmic distance ladder. Conclusions. We have used different methods to test cosmological models at low, intermediate and high redshift by different indicators: this seems to confirm independently these proposed dark energy models. DA - 2007 DB - OpenUCT DP - University of Cape Town IS - 1 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2007 SM - 0004-6361 SM - 1432-0746 T1 - Constraining scalar-tensor quintessence by cosmic clocks TI - Constraining scalar-tensor quintessence by cosmic clocks UR - http://hdl.handle.net/11427/35073 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/35073
dc.identifier.vancouvercitationCapozziello S, Dunsby PKS, Piedipalumbo E, Rubano C. Constraining scalar-tensor quintessence by cosmic clocks. Astronomy and Astrophysics. 2007;472(1):51 - 62. http://hdl.handle.net/11427/35073.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue1
dc.source.journalvolume472
dc.source.pagination51 - 62
dc.source.urihttps://dx.doi.org/10.1051/0004-6361:20077827
dc.subject.othercosmology: observations
dc.subject.othercosmology: cosmological parameters
dc.subject.othercosmology: distance scale
dc.subject.otherDistance scale
dc.subject.otherCosmology
dc.subject.otherDark energy
dc.subject.otherQuasars
dc.subject.otherRed shift
dc.subject.otherGalaxy clusters
dc.subject.otherEinstein field equations
dc.subject.otherExact solution
dc.subject.otherCosmological parameter
dc.subject.otherCosmological models
dc.subject.otherField potential
dc.subject.otherScalar potential
dc.subject.otherScalar fields
dc.subject.otherPower law
dc.subject.otherGravity
dc.subject.otherScalar tensor theory
dc.subject.otherEchelle distance
dc.subject.otherCosmologie
dc.subject.otherEnergie sombre
dc.subject.otherQuasar
dc.subject.otherDéplacement vers le rouge
dc.subject.otherAmas galaxies
dc.titleConstraining scalar-tensor quintessence by cosmic clocks
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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