Reconstruction of an observationally constrained f(RT) gravity model

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dc.contributor.authorBeesham, Aroonkumar
dc.contributor.authorGoswami, Gopikant
dc.contributor.authorPradhan, Anirudh
dc.coverageSingapore
dc.coverage.conferenceissn
dc.date.accessioned2025-12-03T10:19:05Z
dc.date.available2025-12-03T10:19:05Z
dc.date.issued2023
dc.departmentNameMathematical Sciences
dc.description.abstractIn this paper, an attempt is made to construct a Friedmann–Lemaitre–Robertson–Walker model in gravity with a perfect fluid that yields acceleration at late times. We take as . As in the CDM model, we take the matter to consist of two components, viz., and such that . The parameter is the matter density (baryons dark matter), and is the density associated with the Ricci scalar and the trace of the energy–momentum tensor, which we shall call dominant matter. We find that at present is dominant over , and that the two are in the ratio 3:1–3:2 according to the three data sets: (i) 77 Hubble OHD data set, (ii) 580 SNIa supernova distance modulus data set and (iii) 66 pantheon SNIa data which include high red shift data in the range . We have also calculated the pressures and densities associated with the two matter densities, viz., , , and , respectively. It is also found that at present, is greater than . The negative dominant matter pressure creates acceleration in the universe. Our deceleration and snap parameters show a change from negative to positive, whereas the jerk parameter is always positive. This means that the universe is at present accelerating and in the past it was decelerating. State finder diagnostics indicate that our model is at present a dark energy quintessence model. The various other physical and geometric properties of the model are also discussed.
dc.facultyFaculty of Science, Agriculture and Engineering
dc.format.preprintNo
dc.identifier.citationPradhan, A., Goswami, G. and Beesham, A., 2023. Reconstruction of an observationally constrained f (R, T) gravity model. International Journal of Geometric Methods in Modern Physics, 20(10), pp.1-23.
dc.identifier.issn1793-6977 (online)
dc.identifier.issn0219-8878 (print)
dc.identifier.otherhttps://doi.org/10.1142/S0219887823501694
dc.identifier.urihttp://hdl.handle.net/10530/58478
dc.inproceedingsissn
dc.issuenumber20 / 10
dc.keynoteissn
dc.language.isoen
dc.pages1 - 25
dc.peerreviewedYes
dc.publisherWorld Scientific Publishing
dc.subjectf(RT)theory
dc.subjectFlrw metric
dc.subjectObservational parameters
dc.subjectTransit universe
dc.subjectObservational constraints
dc.titleReconstruction of an observationally constrained f(RT) gravity model
dc.title.journalInternational Journal of Geometric Methods in Modern Physics
dc.typeJournal Article
dspace.entity.typePublication
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relation.isAuthorOfPublication.latestForDiscoverycac21718-4edb-4a03-a532-568ac9799cc1
relation.isOrgUnitOfPublication71c06a0e-e111-424c-8caf-20609eacb82c
relation.isOrgUnitOfPublication.latestForDiscovery71c06a0e-e111-424c-8caf-20609eacb82c
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