Reply to “Comment on ‘Quantum Raychaudhuri equation’”

Das, Saurya

doi:10.1103/physrevd.95.068502

Cited by 19 publications

(32 citation statements)

References 22 publications

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“…The exact solutions of the field equations play a crucial role to discuss the composition of astrophysical objects. Das et al [29] presented different features of gravastar in f (R, T ) framework and evaluated a set of complete solutions for three different regions with their corresponding EoS. Shamir and Ahmad [30] solved the f (G, T ) field equations to obtain non-singular solutions of gravastar.…”

Section: Discussionmentioning

confidence: 99%

“…To determine the values of these constants, we consider mass of the gravastar M = 3.75M ⊙ , inner radius R 1 = 10km and outer radius R 2 = 10.009km [44] which provide A = 0.01491932683km −2 , B = 0.2371387429 and C 2 = 186.8400519. The evolution of the metric potential (23) as well as the matter density and pressure ( 24) by inserting the above calculated values of unknowns are displayed in Figures 3 and 4, respectively. We see that the metric function does not possess any singularity and pressure or energy density exhibits positive values throughout the thin-shell of gravastar which sharply decrease with thickness of the shell.…”

Section: The Exterior Geometry and Boundary Conditionsmentioning

confidence: 99%

“…The study of gravastar has motivated the researchers to discuss the effects of modified theories on structural properties of gravastar. In f (R, T ) framework, Das et al [29] analyzed the speculation of gravastar and studied its features graphically with respect to different EoS. Shamir and Ahmad [30] exhibited singularity free solutions of gravastar and extracted mathematical forms of several physical quantities in f (G, T ) background.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Kuchowicz metric function on gravastars in f(R, T) theory

Sharif

Waseem

2020

Eur. Phys. J. Plus

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This paper discusses the configuration of gravitational vacuum star or gravastar with the impact of geometry and matter coupling present in f (R, T) gravity. The gravastar is also conceptualized as a substitute for a black hole which is illustrated by three geometries known as (1) the interior geometry, (2) the intermediate thin-shell and (3) the exterior geometry. For a particular f (R, T) model, we analyze these geometries corresponding to Kuchowicz metric function. We evaluate another metric potential for the interior domain as well as the intermediate shell which is non-singular for both domains. The Schwarzschild metric is adopted to demonstrate the exterior geometry of gravastar, while the numerical values of unknown constants are calculated through boundary conditions. Finally, we discuss different features of gravastar regions like proper length, energy, surface redshift as well as equation of state parameter. We conclude that the gravastar model can be regarded as a successful replacement of the black hole in the context of this gravity.

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Section: Discussionmentioning

confidence: 99%

Section: The Exterior Geometry and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Kuchowicz metric function on gravastars in f(R, T) theory

Sharif

Waseem

2020

Eur. Phys. J. Plus

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“…The interesting concept of the coupling between matter and geometry leads to different modified theories such as f (R, T ) gravity (Harko et al 2011), f (R, T, R γδ T γδ ) theory (Haghani et al 2013;Odintsov and Sáez-Gómes 2013) and f (G, T ) gravity (Sharif and Ikram 2016), where T exhibits the trace of energy-momentum tensor (EMT) and G stands for Gauss-Bonnet invariant. Among these modified theories, f (R, T ) gravity received much attention by several researchers in describing various astrophysical as well as cosmological scenarios with and without electric field (Houndjo 2012;Zubair 2012, 2013a, b;Farhoudi 2013, 2014;Sharif and Zubair 2014;Moraes 2015;Moraes et al 2016;Sharif and Siddiqa 2017;Das et al 2017;Sharif and Waseem 2018a, b;Deb et al 2018a, b;Siddiqa 2018, 2019;Sharif and Nawazish 2019;Sharif and Waseem 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the study of gravastar has attracted many people in modified theories of gravity. Das et al (2017) discussed the conjecture of gravastar in f (R, T ) framework and analyzed its physical characteristics graphically corresponding to different EoS. Shamir and Ahmad (2018) presented non-singular solutions of gravastar and evaluated mathematical expressions of various physical parameters in f (G, T ) scenario.…”

Section: Introductionmentioning

confidence: 99%

Charged Gravastars with Conformal Motion in f(R,T) Gravity

Sharif,

Waseem

2019

Preprint

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This paper studies the effects of charge on a peculiar stellar object, recognized as gravastar, under the influence of f (R, T ) gravity by considering the conjecture of Mazur and Mottola in general relativity. The gravastar is also known as an alternative to a black hole and is expressed by three distinct domains named as (i) the interior domain, (ii) the intermediate shell and (iii) the exterior domain. We analyze these domains for a specific f (R, T ) gravity model conceding the conformal Killing vectors. In the interior domain, we assume that pressure is equal to negative energy density which leads to the existence of repulsive force on the spherical shell. The intermediate shell consists of ultra-relativistic plasma and pressure which shows a direct relation with energy density and counterbalances the repulsive force applied by the interior domain. The exterior vacuum spherical domain is taken to be the de Sitter spacetime illustrated by the Reissner-Nordström metric. We conclude that non-singular solutions of charged gravastar with various physical properties such as length, energy, entropy and equation of state parameter are physically consistent.

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Twin Peak Quasi‐Periodic Oscillations and Stability via Thin‐Shell Formalism of Traversable Wormholes in Symmetric Teleparallel Gravity

Mustafa

Gao

Javed

2022

Fortschritte der Physik

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This article explores the wormhole geometry in the background of symmetric teleparallel gravity or f () gravity, where  is the non-metricity term, and definite subject for the gravitational interaction. All the energy conditions are investigated for two different generic shape functions. The presence of exotic matter is confirmed due to the violation of the energy conditions. The epicyclic orbits of test particles around wormhole throat for the considered models are discussed. Twin peak Quasi-periodic oscillations are calculated and presented with the required behavior. We also explore the physical characteristics and stable configuration of thin-shell developed from the matching of inner obtained solution of wormhole geometry and outer black hole solution in f () gravity. The stability of shell is discussed by using the speed of sound parameter for both choices of shape functions, i.e., 𝜷 1 (D) and 𝜷 2 (D). It is found that the position of event horizon does not change for different values of the physical parameter for the choice of 𝜷 1 (D) while it changes for 𝜷 2 (D). We explore the proper length, shell energy and entropy of the developed structure for different values of physical parameters.

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Reply to “Comment on ‘Quantum Raychaudhuri equation’”

Cited by 19 publications

References 22 publications

Impact of Kuchowicz metric function on gravastars in f(R, T) theory

Impact of Kuchowicz metric function on gravastars in f(R, T) theory

Charged Gravastars with Conformal Motion in f(R,T) Gravity

Twin Peak Quasi‐Periodic Oscillations and Stability via Thin‐Shell Formalism of Traversable Wormholes in Symmetric Teleparallel Gravity

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