Wormhole supported by dark energy admitting conformal motion

Bhar, Piyali; Rahaman, Farook; Manna, Tuhina; Banerjee, Ayan

doi:10.1140/epjc/s10052-016-4547-1

Cited by 34 publications

(13 citation statements)

References 46 publications

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“…If there is the existence of exotic matter inside the compact star, the violation of the energy conditions will occur which was seen to describe the model of wormhole in the context of Einstein's general theory of relativity Bhar et al (2016). If these conditions are satisfied, the existence of ordinary matter is confirmed.…”

Section: Energy Conditionsmentioning

confidence: 98%

Charged strange star in $f(R,T)$ gravity with linear equation of state

Rej¹,

Bhar²

2021

Astrophys Space Sci

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Our present study involves the strange stars model in the framework of f (R, T ) theory of gravitation. We have taken a linear function of the Ricci scalar R and the trace T of the stress-energy tensor T µν for the expression of f (R, T ), i.e., f (R, T ) = R + 2γT to obtain the proposed model, where γ is a coupling constant. Moreover, to solve the hydrostatic equilibrium equations, we consider a linear equation of state between the radial pressure p r and matter density ρ as p r = αρ − β, where α and β are some positive constants, Both α, β depend on coupling constant γ which have been also depicted in this paper. By employing the Krori-Barua ansatz already reported in the literature [J. Phys. A, Math. Gen. 8:508, 1975] we have found the solutions of the field equations in f (R, T ) gravity. The effect of coupling constant γ have been studied on the model parameters like density, pressures, anisotropic factor, compactness, surface redshift, etc. both numerically and graphically. A suitable range for γ is also obtained. The physical acceptability and stability of the stellar system have been tested by different physical tests, e.g., the causality condition, Herrera cracking concept, relativistic adiabatic index, energy conditions, etc. One can regain the solutions in Einstein gravity when γ → 0.

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Section: Energy Conditionsmentioning

confidence: 98%

Charged strange star in $f(R,T)$ gravity with linear equation of state

Rej¹,

Bhar²

2021

Astrophys Space Sci

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“…[12][13][14][15][16] contain extended solutions of this classic black hole, as well as studies of them that include quantum characteristics. Furthermore, in [17], wormholes sustained by dark energy are investigated by using ω < −1 to represent phantom dark energy. Although the EoS can be expressed in the manner p = ωρ, such compact objects may have various EoSs but negative principal pressures if SEC is still violated.…”

Section: Introductionmentioning

confidence: 99%

Dark Energy Stars in Tolman-Kuchowicz spacetime in the context of Einstein Gravity

Bhar

2022

Preprint

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Dark energy is the component in the present Universe with the greatest abundance, and it is responsible for the accelerating expansion of the Universe. As a result, dark energy is likely to interact with any compact astrophysical object [Muhammad F.A.R. Sakti and Anto Sulaksono, Phys. Rev. D 103, 084042 (2021)]. In present paper, we propose a model for a dark energy star made up of dark and ordinary matter in which the density of dark energy is proportional to the density of isotropic perfect fluid matter. In the context of general relativity, the model is derived in the curved Tolman-Kuchowicz spacetime geometry [Tolman, Phys Rev 55:364, (1939); Kuchowicz, Acta Phys Pol 33:541, (1968)]. Here, we look at how dark energy affects stellar mass, compactness, and equilibrium etc. The physical parameters of the model e.g., pressure, density, mass function, surface redshift etc. are investigated, and the stability of stellar configuration is studied in detail. The model has interesting properties because it meets all energy criteria and is free from central singularities. The maximum allowable mass has been obtained from our model with the help of M − R diagram. We analyse many physical properties of the model and checked that it meets all regularity constraints, is stable, and therefore physically realistic.

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“…[14,15]. Besides, wormholes supported by dark energy are also studied in [16] of which the authors take ω < −1 to portray phantom dark energy. Although the EoS can be formulated in the form p = ωρ, as long as SEC is still violated, such compact objects may have different EoSs but with negative principal pressures.…”

Section: Introductionmentioning

confidence: 99%

Dark Energy Stars with Phantom Field

Sakti,

Sulaksono

2021

Preprint

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Dark energy is the constituent with an enormous abundance of the present universe, responsible for the universe's accelerated expansion. Therefore, it is plausible that dark energy may interact within any compact astrophysical objects. The author in Ref. [Phys. Rev. D 83, 127501 (2011)], constructs an exact star solution consisting of an ordinary matter and phantom field from a constant density star (CDS) known as Schwarzschild interior solution. The star denotes a dark energy star (DES). The author claims that the phantom field represents dark energy within the star. So far, the role of the phantom field as dark energy in DES is not systematically studied yet. Related to this issue, we analyze the energy condition of DES. We expect that DES shall violate the strong energy condition (SEC) for a particular condition. We discover that SEC is fully violated only when the compactness reaches the Buchdahl limit. Furthermore, we also investigate the causal conditions and stabilities due to the convective motion and gravitational cracking. We also find that those conditions are violated. These results indicate that DES is not physically stable. However, we may consider DES as an ultra-compact object of which we can calculate the gravitational wave echo time and echo frequency and compare them to those of CDS. We find that the contribution of the phantom field delays the gravitational wave echoes. The effective potential of the perturbed DES is also studied. The potential also enjoys a potential well like CDS but with a deeper well. We also investigate the possibility that DES could form a gravastar when C = 1. It is found that gravastar produced from DES possesses no singularity with a dS-like phase as the interior. These results could open more opportunities for the observational study of dark energy in the near future, mostly from the compact astrophysical objects.

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Wormhole supported by dark energy admitting conformal motion

Cited by 34 publications

References 46 publications

Charged strange star in $f(R,T)$ gravity with linear equation of state

Charged strange star in $f(R,T)$ gravity with linear equation of state

Dark Energy Stars in Tolman-Kuchowicz spacetime in the context of Einstein Gravity

Dark Energy Stars with Phantom Field

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