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Anisotropic quintessence compact star in f(T)gravity with Tolman–Kuchowicz metric potentials
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作者 piyali bhar Farook Rahaman +2 位作者 Shyam Das Somi Aktar Abdelghani Errehymy 《Communications in Theoretical Physics》 SCIE CAS CSCD 2024年第1期61-75,共15页
To obtain analytically relativistic quintessence anisotropic spherical solutions in the f(T)paradigm is the primary objective of this paper.To do this,the pressure anisotropy condition is imposed,and we employ a metri... To obtain analytically relativistic quintessence anisotropic spherical solutions in the f(T)paradigm is the primary objective of this paper.To do this,the pressure anisotropy condition is imposed,and we employ a metric potential of the Tolman–Kuchowicz(TK)type.We also suppose that our current model incorporates a quintessence field characterized by a parameterωq,in addition to the anisotropic matter distribution.In the presence of the parameterα,the field equations are modified by the choice of the f(T)function.The f(T)gravity parameterαadds new components to the basic physical characteristics,such as density,pressure,subliminal sound velocity,surface redshift,etc,of the present model.By selecting the compact star Her X-1 and varyingαfrom 0.5 to 2.5,we examined all the physical characteristics of the model parameter of the configuration.The graphical process demonstrates that a more compact item is produced with greater values ofα.The hydrostatic equilibrium condition of the model is discussed,as well as the mass-radius relationship for our current model is obtained. 展开更多
关键词 quintessence star f(T)gravity stability condition
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Exact Solution of a(2+1)-Dimensional Anisotropic Star in Finch and Skea Spacetime 被引量:1
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作者 piyali bhar Farook Rahaman +1 位作者 Ritabrata Biswas Hafiza Ismat Fatima 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第8期221-226,共6页
We provide a new class of interior solution of a(2+1)-dimensional anisotropic star in Finch and Skea spacetime corresponding to the BTZ black hole. We develop the model by considering the MIT bag model EOS and a parti... We provide a new class of interior solution of a(2+1)-dimensional anisotropic star in Finch and Skea spacetime corresponding to the BTZ black hole. We develop the model by considering the MIT bag model EOS and a particular ansatz for the metric function grrproposed by Finch and Skea [M.R. Finch and J.E.F. Skea, Class. Quantum.Grav. 6(1989) 467]. Our model is free from central singularity and satisfies all the physical requirements for the acceptability of the model. 展开更多
关键词 (2+1)-dimensional ANISOTROPIC STAR Finch and Skea SPACETIME
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Durgapal IV model considering the minimal geometric deformation approach 被引量:1
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作者 Francisco Tello-Ortiz Ángel Rincon +1 位作者 piyali bhar Y.Gomez-Leyton 《Chinese Physics C》 SCIE CAS CSCD 2020年第10期152-168,共17页
The present article reports the study of local anisotropic effects on Durgapal's fourth model in the context of gravitational decoupling via the minimal geometric deformation approach.To achieve this,the most gene... The present article reports the study of local anisotropic effects on Durgapal's fourth model in the context of gravitational decoupling via the minimal geometric deformation approach.To achieve this,the most general equation of state relating the components of the−θsector is imposed to obtain the decoupler function f(r).In addition,certain properties of the obtained solution,such as the behavior of the salient material content threading the stellar interior;causality and energy conditions;hydrostatic balance through the modified Tolman−Oppenheimer−Volkoff conservation equation and stability mechanism against local anisotropies using the adiabatic index;sound velocity of the pressure waves;convection factor;and the Harrison−Zeldovich−Novikov procedure,are investigated to check whether the model is physically admissible or not.Regarding the stability analysis,it is found that the model presents unstable regions when the sound speed of the pressure waves and convection factor are used in distinction with the adiabatic index and Harrison−Zeldovich−Novikov case.To produce a more realistic picture,the numerical data for some known compact objects were determined and different values of the parameterαwere considered to compare with the GR case,i.e.,α=0. 展开更多
关键词 compact objects ANISOTROPY gravitational decoupling
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Particles and Scalar Waves in Noncommutative Charged Black Hole Spacetime
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作者 piyali bhar Farook Rahaman +1 位作者 Ritabrata Biswas U.F.Mondal 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第7期1-8,共8页
In this paper we have discussed geodesics and the motion of test particle in the gravitational field of noncommutative charged black hole spacetime. The motion of massive and massless particle have been discussed sepe... In this paper we have discussed geodesics and the motion of test particle in the gravitational field of noncommutative charged black hole spacetime. The motion of massive and massless particle have been discussed seperately.A comparative study of noncommutative charged black hole and usual Reissner–Nordstr¨om black hole has been done.The study of effective potential has also been included. Finally, we have examined the scattering of scalar waves in noncommutative charged black hole spacetime. 展开更多
关键词 test particle SCALAR WAVES NONCOMMUTATIVE CHARGED
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