Cosmic acceleration and anisotropic models with magnetic field

Tripathy, S. K.; Mahanta, K. L.

doi:10.1140/epjp/i2015-15030-8

Cited by 13 publications

(8 citation statements)

References 89 publications

(106 reference statements)

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“…In other words, if the anisotropic relationship among the directional Hubble rates are presumed to be maintained through out the cosmic evolution in LRSBI model, we can not get accelerating models in General Relativity. This fact has already been investigated earlier [26,[74][75][76]. However, if we modify the Einstein-Hilbert action with a suitable functional form for f (R) other than the linear one, f (R) = R, we may get viable accelerating models.…”

Section: Dynamics Of An Anisotropic Universe In F (R) Gravitymentioning

confidence: 73%

Anisotropic solutions in f(R) gravity

Tripathy

Mishra

2016

Eur. Phys. J. Plus

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Anisotropic cosmological models are investigated in the frame work of f (R) gravity in the metric formalism. Plane symmetric models are considered to incorporate anisotropy in the expansion rates along different spatial directions. The anisotropy in expansion rates are assumed to be maintained throughout the cosmic evolution. Two accelerating models are constructed by considering different functional forms for f (R). The viability of these models are tested through a stability analysis.

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Section: Dynamics Of An Anisotropic Universe In F (R) Gravitymentioning

confidence: 73%

Anisotropic solutions in f(R) gravity

Tripathy

Mishra

2016

Eur. Phys. J. Plus

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“…Hence LRSBI models can not provide accelerating models without the contributions coming from magnetic field, scalar field or cosmic string. However, in presence of cosmic strings, magnetic field or scalar fields the situation gets modified and accelerating models are achieved [33,60]. In the present work, we are interested in the late time cosmic dynamics with preconceived idea of accelerated expansion and therefore, we will force this functional to be non zero.…”

Section: Basic Formalismmentioning

confidence: 99%

Anisotropic dark energy model with a hybrid scale factor

Mishra

Tripathy

2015

Mod. Phys. Lett. A

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Anisotropic dark energy model with dynamic pressure anisotropies along different spatial directions is constructed at the backdrop of a spatially homogeneous diagonal Bianchi type V (BV ) space-time in the framework of General Relativity. A time varying deceleration parameter generating a hybrid scale factor is considered to simulate a cosmic transition from early deceleration to late time acceleration. We found that the pressure anisotropies along the y− and z− axes evolve dynamically and continue along with the cosmic expansion without being subsided even at late times. The anisotropic pressure along the x−axis becomes equal to the mean fluid pressure. At a late phase of cosmic evolution, the model enters into a phantom region. From a statefinder diagnosis, it is found that the model overlaps with ΛCDM at late phase of cosmic time.

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“…usually considered to be proportional to the scalar expansion θ(= 3H) [11][12][13][14][15]. This leads to an anisotropy relation between the metric potentials b and c in the form b = c m .…”

Section: Mathematical Set Up With Physical Parametersmentioning

confidence: 99%

Stability analysis of two-fluid dark energy models

Mishra,

Esmaeili,

Ray

et al. 2021

Preprint

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In this paper, we have studied the stability of the cosmological models with dark energy and combination of matter fields and dark energy in an anisotropic space time. The pressure anisotropy along the spatial directions are derived and its stability in each direction has been examined. The four models presented here, show its stability on certain spatial direction. The role of matter field on the stability analysis has been obtained. The positive and negative value of cosmic string completely changed the stability behaviour of the model. The presence of a magnetic field disturbs the stability aspects of the models at least in an early epoch.

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Cosmic acceleration and anisotropic models with magnetic field

Cited by 13 publications

References 89 publications

Anisotropic solutions in f(R) gravity

Anisotropic solutions in f(R) gravity

Anisotropic dark energy model with a hybrid scale factor

Stability analysis of two-fluid dark energy models

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