Thin-shell wormhole satisfying energy conditions

Forghani, S. Danial; Mazharimousavi, S. Habib; Halilsoy, Mustafa

doi:10.1016/j.physletb.2020.135374

Cited by 16 publications

(7 citation statements)

References 37 publications

(18 reference statements)

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“…Note that due to the opposite direction of the 4-normals explained earlier, the signs of the energy density σ and angular pressure p are opposite the signs of their counterparts in thinshell wormhole theory. It is evident from (15) that in static equilibrium configuration where R = Ṙ = 0, the weak energy condition [23] is satisfied for the perfect fluid at the gate i.e., σ ≥ 0 and σ + p ≥ 0. Therefore unlike for a wormhole the matter on the shell/gate is ordinary.…”

Section: De Sitter Thin-shell Cosmic Gatementioning

confidence: 99%

A Closed Universe: de Sitter Cosmic Gate

Forghani,

Mazharimousavi

2022

Preprint

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A new cosmological object in analogy with the concept of a wormhole in general relativity is introduced. As wormholes connect two distant points through a tunnel in a spacetime, this new object connects two spacetime through a large mouth which is referred to as a "Cosmic Gate". In this context, two identical copies of the regular part of the de Sitter spacetime are cut through a timelike hyperplane, and are glued at their identical boundaries (the only boundary) to form a complete spacetime. The stability of the cosmic gate against a linear radial perturbation is studied as well. Finally, the radial geodesics of the spacetime for a timelike and a null particle are presented.

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Section: De Sitter Thin-shell Cosmic Gatementioning

confidence: 99%

A Closed Universe: de Sitter Cosmic Gate

Forghani,

Mazharimousavi

2022

Preprint

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“…From σ and p, we can obtain the effective pressure following the prescription of [63]. The potential can offer a phenomenological description of the deflection of light and the inner most stable circular orbit (ISCO) for the accretion disk [69,70].…”

Section: Introductionmentioning

confidence: 99%

Non-exotic static spherically symmetric thin-shell wormhole solution in f (Q, T ) gravity*

2023

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In this study, we have conducted an analysis of traversable wormhole solutions within the framework of linear $f(Q, T) = \alpha Q + \beta T$ gravity, ensuring that all the energy cnditions hold for the entire spacetime. The solutions presented in this study were derived through a comprehensive analytical examination of the parameter space associated with the wormhole model. This involved considering the exponents governing the redshift and shape functions, as well as the radius of the wormhole throat ($r_0$), the redshift function value at the throat ($\phi_0$), and the model parameters ($\alpha$ and $\beta$). Also, we have established bounds on these free parameters that guarantee the satisfaction of the energy conditions throughout spacetime and have also provided two solutions. Further, we have used the Israel junction condition to see the stability of a thin-shell around the wormhole. We have also calculated the NEC criteria and potential for such a thin-shell and how it varies with the chosen shape function.

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“…We should add that the traversable wormhole introduced in [3,4] is the direct solution of Einstein's equation in Einstein's -theory of gravity. Recently, there have been traversable wormhole solutions in some modified theories of gravity in which the matters supporting the wormhole solution satisfy the NEC [7][8][9][10][11][12][13][14][15][16][17][18][19]. The mechanism of such modified theories is as follows.…”

Section: Introductionmentioning

confidence: 99%

“…dot stands for d dt . Following the definition of the extrinsic curvature in(19), we calculate the discontinuity of the components of the mixed extrinsic curvature tensor which are expressed by in which a prime symbol ¢ implies the derivative of the function with respect to r and is evaluated at the throat. Having the discontinuity of the extrinsic curvature found, the second Israel junction conditions yields…”

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confidence: 99%

Stability of thin-shell-wormhole in Robertson-Walker closed universe I: static universe

Amirabi

2023

Phys. Scr.

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We construct a generic thin-shell wormhole (TSW) in the Robertson-Walker(RW) cosmological model of the universe. The general formalism is presentedand here in this paper - the first part of the research- we investigate thestability of the TSW constructed in the static RW universe. To do so, weperform two different stability analyses namely a mechanical linear radialperturbation and a small speed exact (not linearized) perturbation. It isshown that the corresponding TSW is stable against a linear radialperturbation provided that the variable equation of state of the surfaceenergy-momentum tensor is finely tuned. On the other hand, the exactstability analysis in the context of small-speed perturbation reveals thatthe throat of the TSW for the closed static universe oscillates between thecenter of the universe and the outer boundary.

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Thin-shell wormhole satisfying energy conditions

Cited by 16 publications

References 37 publications

A Closed Universe: de Sitter Cosmic Gate

A Closed Universe: de Sitter Cosmic Gate

Non-exotic static spherically symmetric thin-shell wormhole solution in f (Q, T ) gravity*

Stability of thin-shell-wormhole in Robertson-Walker closed universe I: static universe

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