The models of transit cosmology along with observational constriction in f(Q, T) gravity

被引:29
作者
Pradhan, Anirudh [1 ]
Dixit, Archana [1 ]
机构
[1] GLA Univ, Inst Appl Sci & Humanities, Dept Math, Mathura 281406, Uttar Pradesh, India
关键词
FLRW universe; modified f(Q; T); gravity; transit universe; observational constraints; SCALAR-TENSOR THEORY; DARK ENERGY; UNIVERSE; CONSTRAINTS; STATEFINDER; SUPERNOVAE; INFLATION; GALAXIES;
D O I
10.1142/S0219887821501590
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Xu et al. (Eur. Phys. J. C 79 (2019) 708) have anticipated the theory of Gravity. The modified study of f(Q,T) is elucidated here as Cosmological model. In it the action holds a role as a capricious arbitrary function f(Q,T). At this juncture Q functions as non-metricity and for matter fluid, T outlines as energy-momentum tensor. The function f(Q,T) quadratic in Q and linear in T as f(Q,T) = alpha Q + beta Q(2) + gamma T has been taken as our research in which alpha, beta and gamma stand as model parameters, induced by f(R,T) gravity. A range of cosmological parameters have been attained by us such as in Universe viz. Hubble parameter H, Friedmann-Lemaitre-Robertson-Walker (FLRW), deceleration parameter q, etc. in terms of scale-factor and in terms of redshift z by confining to the law of energy-conservation. The fittest values of the model parameters have been acquired by us as the observational constrictions on the model, by utilizing the accessible data sets like Hubble data sets H(z), union 2.1 compilation of SNe Ia data sets and Joint Light Curve Analysis (JLA) data sets. We have applied R-2-test formula. The values of various observational parameters have been premeditated by us viz. H-0, q(0), t(0) and state finder parameters (s,r). They are absolutely very close to the standard cosmological models. It has also been observed by us that the deceleration parameter q(z) exhibits signature-flipping (transition) point within the range 0.423 <= z(t) <= 0.668. It is observed that it changes its phase from decelerated to accelerated expanding universe with equation of state (EoS) - 1.071 <= omega - 0.96 for 0 <= z <= 3.
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页数:20
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