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$f(Q,T)$ gravity models with observational constraints | | Simran Arora
; S. K. J. Pacif
; Snehasish Bhattacharjee
; P.K. Sahoo
; | | Date: |
3 Jul 2020 | | Abstract: | The paper presents late time cosmology in $f(Q,T)$ gravity where the dark
energy is purely geometric in nature. We start by employing a well motivated
$f(Q,T)$ gravity model, $f(Q,T)=mQ^{n}+bT$ where $m,n$ and $b$ are model
parameters. Additionally we also assume the universe to be dominated by
pressure-less matter which yields a power law type scale factor of the form $%
a(t)=c_{2}(At+c_{1})^{frac{1}{A}}$, where $A=dfrac{3(8pi +b)}{n(16pi +3b)%
}$ and $c_{1}$ & $c_{2}$ are just integration constants. To investigate the
cosmological viability of the model, constraints on the model parameters were
imposed from the updated 57 points of Hubble data sets and 580 points of union
2.1 compilation supernovae data sets. We have thoroughly investigated the
nature of geometrical dark energy mimicked by the parametrization of
$f(Q,T)=mQ^{n}+bT$ with the assistance of statefinder diagnostic in ${s,r}$
and ${q,r}$ planes and also performed the $Om$ -diagnostic analysis. The
present analysis makes it clear-cut that $f(Q,T)$ gravity can be promising in
addressing the current cosmic acceleration and therefore a suitable alternative
to the dark energy problem. Further studies in other cosmological areas are
therefore encouraging to further investigate the viability of $f(Q,T)$ gravity. | | Source: | arXiv, 2007.1703 | | Services: | Forum | Review | PDF | Favorites | |
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