Cosmological models with variable anisotropic parameter in f(R, T) gravity

Mishra, B.; Esmeili, F.; Ray, Saibal

doi:10.1007/s12648-020-01877-2

Cited by 31 publications

(8 citation statements)

References 77 publications

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“…Furthermore, Maurya et al [69] have demonstrated the existence of strange star candidates beyond the standard maximum mass limit by employing the gravitational decoupling method within 5D Einstein-Gauss-Bonnet formalism. In this connection, some more solutions including cosmological models have been investigated in f (R, T ), f (T ), and f (T, T ) gravity theories [78][79][80][81].…”

Section: Jcap10(2022)003mentioning

confidence: 99%

Exploring physical properties of minimally deformed strange star model and constraints on maximum mass limit in f(𝒬) gravity

Maurya

Mustafa

Govender

et al. 2022

J. Cosmol. Astropart. Phys.

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Our current investigation is inherently linked to the observations of gravitational waves from the GW190814 event which suggests that the source of the signals can be ascribed to a compact binary coalescence of a 22.2 to 24.3M ⊙ black hole and a compact object endowed with a mass of 2.50 to 2.67M ⊙. In the current exposition, we are concerned with modeling of the lower mass component of the coalescence pair. We utilize the f(𝒬) gravity together with the Minimal Geometric Deformation (MGD) technique to obtain compact stellar objects with masses aligned with the GW190814 event. Starting off with the Tolman IV ansatz for one of the metric functions, together with an MIT Bag model equation of state we are able to reduce the problem of fully describing the gravitational behavior of the seed solution to a quadrature. Through the MGD technique, we introduce anisotropy by deforming the radial part of the gravitational potential. This enables us to obtain two new classes of solutions which depend on the metricity parameter, 𝒬 and the deformation constant, β. We show that these two parameters play a crucial role in determining the thermodynamical behavior and stability of our models. In particular, we show that the interplay between the metricity parameter and the deformation constant predicts the mass of the progenitor articulating as the secondary component of GW190814.

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Section: Jcap10(2022)003mentioning

confidence: 99%

Exploring physical properties of minimally deformed strange star model and constraints on maximum mass limit in f(𝒬) gravity

Maurya

Mustafa

Govender

et al. 2022

J. Cosmol. Astropart. Phys.

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“…Nevertheless, the nature and origin for the violation of the homogeneity and isotropy has yet resolved [14]. In view of this, in the present work, we are motivated to take up this bouncing issue in a homogeneous and anisotropic background of the metric in the framework of an extended theory of gravity [15,16].…”

Section: Introductionmentioning

confidence: 99%

Role of Extended Gravity Theory in Matter Bounce Dynamics

Agrawal,

Tripathy,

Pal

et al. 2022

Preprint

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In this work, we have studied some bouncing cosmologies in the frame work of f (R, T) gravity. The bouncing scenario has been formulated to avoid the big bang singularity. The physical and geometrical parameters are investigated. The effect of the extended gravity theory on the dynamical parameters of the model is investigated. It is found that, the f (R, T) gravity parameter affects the cosmic dynamics substantially. We have also, tested the model through the calculation of the cosmographic coefficients and the Om(z) parameter. A scalar field reconstruction of the bouncing scenario is also carried out. The stability of the model are tested under linear, homogeneous and isotropic perturbations.

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“…In recent times, the bouncing scenario has been extensively studied in the curvature and torsion based modified gravity and in the scalar tensor models. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…The antisymmetry of the linked geometrical objects is presumptively respected by the Lagrange multipliers. Therefore, vanishing curvature R μ βαγ = 0 and torsion T μ αβ = 0 are imposed, as is expected in the symmetric teleparallel framework, by the equations λ scalar-curvature case the action does not preserve its form under the local conformal rescaling of the metric.gμν = e − √ 2/3 (ϕ) g μν(27)…”

mentioning

confidence: 98%

Matter bounce scenario in extended symmetric teleparallel gravity

2023

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In this paper, we have shown the matter bounce scenario of the Universe in an extended symmetric teleparallel gravity, the f(Q) gravity. Motivated from the bouncing scenario and loop quantum cosmology (LQC), the form of the function f(Q) has been obtained at the backdrop of Friedmann–Lema$${\hat{i}}$$ i ^ tre–Robertson Walker (FLRW) space time. Considering the background cosmology dominated by dust fluid, the e-folding parameter has been expressed, which contains the nonmetricity term. Since the slow roll criterion in the bouncing context is not valid, we used a conformal equivalence between f(Q) and scalar-tensor model to apply the bottom-up reconstruction technique in the bouncing model. The dynamics of the model has been studied through the phase space analysis, where both the stable and unstable nodes are obtained. Also, the stability analysis has been performed with the first order scalar perturbation of the Hubble parameter and matter energy density to verify the stability of the model.

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Cosmological models with variable anisotropic parameter in f(R, T) gravity

Cited by 31 publications

References 77 publications

Exploring physical properties of minimally deformed strange star model and constraints on maximum mass limit in f(𝒬) gravity

Exploring physical properties of minimally deformed strange star model and constraints on maximum mass limit in f(𝒬) gravity

Role of Extended Gravity Theory in Matter Bounce Dynamics

Matter bounce scenario in extended symmetric teleparallel gravity

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