Stability analysis of an oscillating cylinder

Sharif, M.; Mumtaz, Saadia

doi:10.1140/epjp/i2017-11698-x

Cited by 10 publications

(9 citation statements)

References 16 publications

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“…The same choice has been made by many authors in many different applications of the theory, such as the recent references. 17,[67][68][69][70] We have then substituted the Morris-Thorne WH metric (7) in the field equa- tions (5) of the model. The material solutions were obtained from a hyperbolic shape function, such as in Ref., 53 for logarithmic 54 and constant redshift functions.…”

Section: Discussionmentioning

confidence: 99%

Phantom fluid supporting traversable wormholes in alternative gravity with extra material terms

Sahoo

Moraes

Ribeiro

2018

Int. J. Mod. Phys. D

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Wormholes are tunnels connecting different regions in space-time. They were obtained originally as a solution for Einstein's General Relativity theory and according to this theory they need to be filled by an exotic kind of anisotropic matter. In the present sense, by "exotic matter" we mean matter that does not satisfy the energy conditions. In this article we propose the modelling of wormholes within an alternative gravity theory that proposes an extra material (rather than geometrical) term in its gravitational action. Our solutions are obtained from well-known particular cases of the wormhole metric potentials, named redshift and shape functions, and yield the wormholes to be filled by a phantom fluid, that is, a fluid with equation of state parameter ω < −1. In possession of the solutions for the wormhole material content, we also apply the energy conditions to them. The features of those are carefully discussed.

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Section: Discussionmentioning

confidence: 99%

Phantom fluid supporting traversable wormholes in alternative gravity with extra material terms

Sahoo

Moraes

Ribeiro

2018

Int. J. Mod. Phys. D

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“…It is worth mentioning here that the radius obtained for quark stars is physically viable while the radius observed for realistic polytropic EoS is much smaller than the predicted radii of neutron stars. However, in the context of f (R, T ) gravity, the physical attributes of the stellar system with radius r ≈ 0.06km have been discussed in literature for realistic polytropic EoS [37].…”

Section: Metric Functions Density and Pressurementioning

confidence: 99%

Stellar evolution of compact stars in curvature–matter-coupling gravity

Sharif

Waseem

2019

Progress of Theoretical and Experimental Physics

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This paper is devoted to study the stellar evolution of compact objects whose energy density and pressure of the fluid are interlinked by means of MIT bag model and a realistic polytropic equation of state in the scenario of f (R, T, Q) gravity, where Q = R ab T ab . We derive the field equations as well as the hydrostatic equilibrium equation and analyze their solutions numerically for R + δQ functional form with δ being a coupling parameter. We discuss the dependence of various physical properties such as pressure, energy density, total mass and surface redshift on the chosen values of the model parameter. The physical acceptability of the proposed model is examined by checking the validity of energy conditions, causality condition, and adiabatic index. We also study the effects arising due to matter-curvature coupling on the compact stellar system. It is found that maximum mass point lies within the observational range which indicates that our model is appropriate to describe dense stellar objects.

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“…There are numerous studies that consider different black holes in de-Sitter and anti-de-Sitter spacetimes [23][24][25][26][27][28]. Also thin-shell wormholes can be obtained from regular black holes [29,30]. In this letter we construct Bardeen de-Sitter thin-shell wormhole.…”

Section: Introductionmentioning

confidence: 99%