Constraints on barotropic dark energy models by a new phenomenological q(z) parameterization

Román-Garza, Jaime; Verdugo, T.; Magaña, Juan; Motta, V.

doi:10.1140/epjc/s10052-019-7390-3

Cited by 63 publications

(22 citation statements)

References 68 publications

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“…The results obtained for the transition i.e. redshift (z t ) and q 0 in the present model are consistent with values mentioned in literature [29][30][31][32][33][34][35][36][37].…”

Section: Cosmographic Parameterssupporting

confidence: 92%

Energy conditions in $f(Q,T)$ gravity

Arora,

Sahoo

2020

Preprint

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The recently proposed f (Q, T) gravity (Xu et al. Eur. Phys. J. C 79 (2019) 708) is an extension of the symmetric teleparallel gravity. The gravitational action L is given by an arbitrary function f of the non-metricity Q and the trace of the matter-energy momentum tensor T. In this paper, we examined the essence of some well prompted forms of f (Q, T) gravity models i.e. f (Q, T) = mQ + bT and f (Q, T) = mQ n+1 + bT where m, b, and n are model parameters. We have used the proposed deceleration parameter, which predicts both decelerated and accelerated phases of the Universe, with the transition redshift by recent observations and obtains energy density (ρ) and pressure (p) to study the various energy conditions for cosmological models. The equation of state parameter (ω −1) in the present model also supports the accelerating behavior of the Universe. In both, the models, the null, weak, and dominant energy conditions are obeyed with violating strong energy conditions as per the present accelerated expansion.

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“…The results obtained for the transition i.e. redshift (z t ) and q 0 in the present model are consistent with values mentioned in literature [29][30][31][32][33][34][35][36][37].…”

Section: Cosmographic Parameterssupporting

confidence: 92%

Energy conditions in $f(Q,T)$ gravity

Arora,

Sahoo

2020

Preprint

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“…Keep in mind that the universe terminates in a de Sitter expansion at asymptotically lower redshifts. We find that the present value of deceleration parameter (q 0 ) [35,36] and z t [37,38] is in good agreement with SNeIa and Hz + BAO + SNeIa data sets.…”

Section: Cosmological Evolutionsupporting

confidence: 83%

Squared Torsion f(T,T)$f(T,\mathcal {T})$ Gravity and Its Cosmological Implications

Arora¹,

Bhat²,

Sahoo³

2022

Fortschritte der Physik

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We present the coupling of the torsion scalar T and the trace of energy‐momentum tensor T$\mathcal {T}$, which produces new modified ffalse(T,scriptTfalse)$f(T,\mathcal {T})$ gravity. Moreover, we consider the functional form f(T,T)=αscriptT+βT2$f(T,\mathcal {T}) =\alpha \mathcal {T}+\beta T^2$ where α and β are free parameters. As an alternative to a cosmological constant, the ffalse(T,scriptTfalse)$f(T,\mathcal {T})$ theory may offer a theoretical explanation of the late‐time acceleration. The recent observational data to the considered model especially the bounds on model parameters is applied in detail. Furthermore, we analyze the cosmological behavior of the deceleration, effective equation of state and total equation of state parameters. However, it is seen that the deceleration parameter depicts the transition from deceleration to acceleration and the effective dark sector shows a quintessence‐like evolution.

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“…5 compares the q 0 and z t obtained for several models reported in the literature (see these Refs. [14,38,48,[60][61][62][63][64][65][66][67] for more details about the models and cosmological data used). The vertical band represents ±1σ around the central value of LCDM.…”

Section: Constraints and Resultsmentioning

confidence: 99%

Constraints and cosmography of $$\Lambda $$CDM in presence of viscosity

2020

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In this work, we study two scenarios of the Universe filled by a perfect fluid following the traditional dark energy and a viscous fluid as dark matter. In this sense, we explore the most simple case for the viscosity in the Eckart formalism, a constant, and then, a polynomial function of the redshift. We constrain the phase-space of the model parameters by performing a Bayesian analysis based on Markov Chain Monte Carlo method and using the latest data of the Hubble parameter (OHD), Type Ia Supernovae (SNIa) and Strong Lensing Systems. The first two samples cover the region $$0.01<z<2.36$$ 0.01 < z < 2.36 . Based on AIC, we find equally support of these viscous models over Lambda-Cold Dark Matter (LCDM) taking into account OHD or SNIa. On the other hand, we reconstruct the cosmographic parameters (q, j, s, l) and find good agreement to LCDM within up to $$3\sigma $$ 3 σ CL. Additionally, we find that the cosmographic parameters and the acceleration-deceleration transition are sensible to the parameters related to the viscosity coefficient, making of the viscosity an interesting physical mechanism to modified them.

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Constraints on barotropic dark energy models by a new phenomenological q(z) parameterization

Cited by 63 publications

References 68 publications

Energy conditions in $f(Q,T)$ gravity

Energy conditions in $f(Q,T)$ gravity

Squared Torsion f(T,T)$f(T,\mathcal {T})$ Gravity and Its Cosmological Implications

Constraints and cosmography of $$\Lambda $$CDM in presence of viscosity

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