Anisotropic Bianchi-III cosmological model in f (R, T) gravity

Sahoo, P. K.; Sahu, Sudhakar; Nath, Anasuya

doi:10.1140/epjp/i2016-16018-6

Cited by 38 publications

(22 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hypothetically matter plays more fundamental role in the description of gravitational effects of the universe. In literature, several models have been observed through different physically reliable matter in f (R, T ) gravity [18][19][20][21]. Using Noether symmetry Momeni et al [22] have researched flat FRW universe model with f (R) and f (R, T ) gravitation theories.…”

mentioning

confidence: 99%

Magnetized strange quark matter in f ( R, T ) gravity with bilinear and special form of time varying deceleration parameter

2018

View full text Add to dashboard Cite

In this paper, we have studied homogeneous and anisotropic locally rotationally symmetric (LRS) Bianchi type-I model with magnetized strange quark matter (MSQM) distribution and cosmological constant Λ in f (R, T ) gravity where R is the Ricci scalar and T the trace of matter source. The exact solutions of the field equations are obtained under bilinear and special form of time varying deceleration parameter (DP). Firstly, we have considered two specific forms of bilinear DP with a single parameter of the form: q = α(1−t) 1+t and q = − αt 1+t , which leads to the constant or linear nature of the function based on the constant α. Second one is the special form of the DP as q = −1 + β 1+a β . From the results obtained here, one can observe that in the early universe magnetic flux has more effects and it reduces gradually in the later stage. For t → ∞, we get p → −Bc and ρ → Bc. The behaviour of strange quark matter along with magnetic epoch gives an idea of accelerated expansion of the universe as per the observations of the type Ia Supernovae.The theoretical arguments for the late-time cosmic acceleration are being a major issue among cosmologist of the twentieth century. The idea of this accelerated expansion of universe was discovered nearly 20 years ago by observations through Supernovae Ia [1-5], CMB [6,7], baryon acoustic oscillation (BAO) in galaxy clustering [8][9][10] and WMAP [11] etc. To investigate the nature of the universe, modern cosmology continues to test the above predictions, which leads to the refinement of cosmological models. The nature and behaviour of some unknown mechanism of the universe are responsible for this accelerated expansion, commonly referred as dark energy and contains more energy budget of the universe along with negative pressure. It triggers one of the important issue to study the current acceleration of the universe.Instead of resorting the mysterious concept of dark energy, there is an alternative way to reproduce the dynamics of the expanding universe through modified theories of gravity which is an extension of general relativity. These modifications can occur in several ways such as: one can use a base as the torsional formulation of general relativity called the teleparallel gravity equivalent to general relativity [12] e.g. f (T ) gravity, where T is the torsion scalar. On the other hand one can start the curvature formulation of general relativity in Einstein-Hilbert action by replacing the Ricci scalar with its arbitrary functions or even more complicated curvature invariants such as: f (R), f (R, G) gravity, and the latest f (R, T ) gravity proposed by Harko et al. [13]. The matter Lagrangian of f (R, T ) gravity coupled with Ricci scalar R and trace of energy-momentum tensor T . Such Lagrangian with matter content will differ from the Einstein's one. It has much significance to study late-time cosmic acceleration as well as dark energy and dark matter problem [14][15][16][17]. Hypothetically matter plays more fundamental role in the description of gravitational eff...

show abstract

mentioning

confidence: 99%

Magnetized strange quark matter in f ( R, T ) gravity with bilinear and special form of time varying deceleration parameter

2018

View full text Add to dashboard Cite

show abstract

“…In another work, they have explored the evolutionary behaviour of compact objects [21]. Recently, Sahoo and his collaborators have extensively investigated different aspects of this modified gravity theory and have reconstructed some f (R, T ) cosmological models for anisotropic universes [22][23][24][25][26][27]. Some higher dimensional models have also been constructed in recent times in f (R, T ) theory [23,28].…”

mentioning

confidence: 99%

Cosmic transit and anisotropic models in f(R,T) gravity

Sahu¹,

Tripathy²,

Sahoo³

et al. 2017

Chinese Journal of Physics

Self Cite

View full text Add to dashboard Cite

Accelerating cosmological models are constructed in a modified gravity theory dubbed as f (R, T ) gravity at the backdrop of an anisotropic Bianchi type-III universe. f (R, T ) is a function of the Ricci scalar R and the trace T of the energy-momentum tensor and it replaces the Ricci scalar in the Einstein-Hilbert action of General Relativity. The models are constructed for two different ways of modification of the Einstein-Hilbert action. Exact solutions of the field equations are obtained by a novel method of integration. We have explored the behaviour of the cosmic transit from an decelerated phase of expansion to an accelerated phase to get the dynamical features of the universe. Within the formalism of the present work, it is found that, the modification of the Einstein-Hilbert action does not affect the scale factor. However the dynamics of the effective dark energy equation of state is significantly affected.

show abstract

“…The literature includes several works with certain linear forms of f ( R , T ) gravity (Harko et al 2011; Sahoo et al 2016, 2020). We have considered the linear form of f ( R , T ) gravity in the last second section, which demonstrates some consistency with ΛCDM and non‐linear form.…”

Section: Introductionmentioning

confidence: 99%

Energy conditions in non‐minimally coupled f(R, T) gravity

2021

View full text Add to dashboard Cite

In today's scenario, going beyond Einstein's theory of gravity leads us to some more complete and modified gravity theories. One of them is the f (R, T) gravity in which R is the Ricci scalar, and T is the trace of the energy-momentum tensor. Using a well-motivated linear f (R, T) gravity model with a single parameter, we studied the strong energy condition (SEC), the weak energy condition (WEC), the null energy condition (NEC), and the dominant energy condition (DEC) under the simplest non-minimal matter geometry coupling with a perfect fluid distribution. The model parameter is constrained by energy conditions and a single-parameter proposed equation of state (EoS), resulting in the compatibility of the f (R, T) models with the accelerated expansion of the universe. It is seen that the EoS parameter illustrates the quintessence phase in a dominated accelerated phase, pinpoint to the cosmological constant yields as a prediction the phantom era. Also, the present values of the cosmological constant and the acceleration of the universe are used to check the viability of our linear f (R, T) model of gravity. It is observed that the positive behavior of DEC and WEC indicates the validation of the model. In contrast, SEC is violating the condition resulting in the accelerated expansion of the universe.

show abstract

Anisotropic Bianchi-III cosmological model in f (R, T) gravity

Cited by 38 publications

References 38 publications

Magnetized strange quark matter in f ( R, T ) gravity with bilinear and special form of time varying deceleration parameter

Magnetized strange quark matter in f ( R, T ) gravity with bilinear and special form of time varying deceleration parameter

Cosmic transit and anisotropic models in f(R,T) gravity

Energy conditions in non‐minimally coupled f(R, T) gravity

Contact Info

Product

Resources

About