Relativistic stellar modeling with perfect fluid core and anisotropic envelope fluid

Khunt, A. C.; Thomas, V. O.; Vinodkumar, P. C.

doi:10.1007/s12648-023-02692-1

Cited by 2 publications

(1 citation statement)

References 67 publications

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“…It is evident from our calculation that the huge free energy release of anisotropic solid SSs can naturally provide an alternative way to power γ-ray bursts, fast radio bursts, and soft γ-ray repeaters without extremely strong magnetic fields. Such kind of stress-energy stored in anisotropic stars to be releasable during a starquake has also been emphasized by Khunt et al (2023), showing how the difference between sound propagation in radial and tangential directions would be used to identify potentially stable regions within a configuration.…”

Section: Introductionmentioning

confidence: 89%

Free Energy of Anisotropic Strangeon Stars

Chen,

Gao,

Zhou

et al. 2024

Res. Astron. Astrophys.

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Can pulsar-like compact objects release further huge free energy besides the kinematic energy of rotation? This is actually relevant to the equation of states of cold supra-nuclear matter, which is still under hot debate.Enormous energy is surely needed to understand various observations, such as γ-ray bursts, fast radio bursts and soft γ-ray repeaters. In this paper, the elastic/gravitational-free energy of solid strangeon star is revisited, with two anisotropic models to calculate in general relativity. It is found that huge free energy (> 1046 erg) could be released via starquakes, given an extremely small anisotropy ((pt-pr)/pr ∽10-4, with pt/pr the tangential/radial pressure), implying pulsar-like stars could have great potential of free energy release without extremely strong magenetic fields.

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Section: Introductionmentioning

confidence: 89%

Free Energy of Anisotropic Strangeon Stars

Chen,

Gao,

Zhou

et al. 2024

Res. Astron. Astrophys.

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A study of Morris–Thorne wormhole in Einstein–Cartan theory

Soni,

Khunt,

Hasmani

2024

Int. J. Geom. Methods Mod. Phys.

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This paper focuses on the Einstein–Cartan theory, an extension of general relativity that incorporates a torsion tensor into spacetime. The differential form technique is employed to analyze the Einstein–Cartan theory, which replaces tensors with tetrads. A tetrad formalism, specifically the Newman–Penrose–Jogia–Griffiths formalism, is used to study the field equations. Also, the energy–momentum tensor is determined, considering a Weyssenhoff fluid with anisotropic matter. The spin density is derived in terms of the redshift function. Additionally, our findings demonstrate that the radial sound speed within the wormhole throat exceeds the speed of light, suggesting the existence of superluminal matter, while the tangential sound speed indicates near-light-speed propagation, particularly within the throat, emphasizing the significance of exotic matter in comprehending wormhole properties. The results also extend to examining the energy conditions at the throat of a Morris–Thorne wormhole, shedding light on the properties of wormholes within the context of the Einstein–Cartan theory, including the energy conditions at the throat.

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Relativistic stellar modeling with perfect fluid core and anisotropic envelope fluid

Cited by 2 publications

References 67 publications

Free Energy of Anisotropic Strangeon Stars

Free Energy of Anisotropic Strangeon Stars

A study of Morris–Thorne wormhole in Einstein–Cartan theory

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