Does particle creation mechanism favour formation of black hole or naked singularity?

Bhattacharjee, Sudipto; Saha, Subhajit; Chakraborty, Subenoy

doi:10.1140/epjc/s10052-018-5965-z

Cited by 4 publications

(2 citation statements)

References 53 publications

(76 reference statements)

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“…In the BH scenario, the apparent horizon forms at a stage earlier than the singularity formation. The outside event horizon then entirely covers the final stages of collapse when the singularity forms, while the apparent horizon inside the matter evolves from the outer shell to reach the singularity at the instant of its formation [61,62]. The equations (32) and (33) show that t AH and t s both give finite time durations.…”

Section: Occurrence Of Black Holementioning

confidence: 99%

Black hole formation in gravitational collapse and their astrophysical implications

Jaiswal,

Kumar,

Kumar Srivastava

et al. 2024

Phys. Scr.

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In this study, we have explored the process of black hole (BH) formation occurring in the collapse of a self-gravitating configuration using an innovative approach. The exact solution of the Einstein field equations is obtained in a model-independent way by considering a parametrization of the expansion scalar ($\Theta$) in the background of spherically symmetric space-time geometry governed by the FLRW metric. Smooth matching of the interior solution with the Schwarzschild exterior metric across the boundary hypersurface of the star, together with the condition that the mass function $m(t,r)$ is equal to Schwarzschild mass $M$, is used to obtain all the physical and geometrical parameters in terms of the stellar mass. The four known massive stars namely $R136a3$, $Melnick$, $R136c$, and $R136b$ with their known astrophysical data (mass, radius, and present age) are used to study the physics of the model both numerically and graphically. We demonstrate that the formation of the apparent horizon occurs earlier than the singular state that is, the collapse of massive stars in our model results in the eventual formation of black holes as their final state. We have conducted an analysis indicating that the lifespans of massive stars are closely related to their respective masses. Our findings demonstrate that more massive stars exhibit considerably shorter lifespans in comparison to their lighter counterparts. Thus, the presented model corresponds to the evolutionary stages of astrophysical stellar objects and theoretically predicts their possible lifespan. We have also shown that our model satisfies the energy conditions and stability requirements via Herrera's cracking method.

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Section: Occurrence Of Black Holementioning

confidence: 99%

Black hole formation in gravitational collapse and their astrophysical implications

Jaiswal,

Kumar,

Kumar Srivastava

et al. 2024

Phys. Scr.

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“…Using the WKB approach, the number density and renormalized energy-momentum tensor of the created spin-1/2 particle in the spatially flat (3+1)-dimensional Friedmann-Robertson-Walker (FRW) spacetime have been calculated [20]. The effect of the scalar particle creation on the collapse of a spherically symmetric massive star was investigated and it was demonstrated that the collapsing process was not independent from the particle creation rate [21]. Moreover, in [22] thermodynamics laws and equilibrium conditions are discussed in the presence of particle creation in the context of the (3+1)-dimensional Chern-Simons gravity theory.…”

Section: Introductionmentioning

confidence: 99%

Particle Production via Dirac Dipole Moments in the Magnetized and Nonmagnetized Exponentially Expanding Universe

Doğan¹,

Geçim²,

Sucu

2019

Advances in High Energy Physics

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In the present paper, we solve the Dirac equation in the 2+1 dimensional exponentially expanding magnetized by uniform magnetic field and nonmagnetized universes, separately. Asymptotic behaviors of the solutions are determined. Using these results we discuss the current of a Dirac particle to discuss the polarization densities and the magnetization density in the context of Gordon decomposition method. In this work we also calculate the total polarization and magnetization, to investigate how the magnetic field affects the particle production. Furthermore, the electric and the magnetic dipole moments are calculated, and based on these, we have discussed the effects of the dipole moments on the charge distribution of the universe and its conductivity for both the early and the future time epoch in the presence/absence of a constant magnetic field and exponentially expanding spacetime.

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An Eternal gravitational collapse in f(R) theory of gravity and their astrophysical implications

Jaiswal,

Kumar,

Srivastava

et al. 2024

Chinese Journal of Physics

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Does particle creation mechanism favour formation of black hole or naked singularity?

Cited by 4 publications

References 53 publications

Black hole formation in gravitational collapse and their astrophysical implications

Black hole formation in gravitational collapse and their astrophysical implications

Particle Production via Dirac Dipole Moments in the Magnetized and Nonmagnetized Exponentially Expanding Universe

An Eternal gravitational collapse in f(R) theory of gravity and their astrophysical implications

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