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• W3161613228 abstract "Abstract The null and timelike geodesic motion in the vicinity of the Schwarzschild black hole in the presence of the string cloud parameter a and the quintessence field parameter q is studied. The ranges for both the parameters a and q are determined, which allow the existence of the black hole. In the radial motion of photon, the coordinate time t first decreases with the increasing values of both the parameters a and q and then in the close proximity of the horizon of the black hole, there is a turning point, after which the effect of the quintessence field is just opposite on the time t . For the massive particles, the proper time $$tau $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>τ</mml:mi> </mml:math> decreases with increasing values of the parameter a and increases with increase in the value of the parameter q . In the same case of the massive particles, the coordinate time t decreases with increase in the values of both the parameters a and q . Further, it is found that for test particles, the stable circular orbits exist in this spacetime for small values of both the parameters i.e., for $$0<all 1$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>0</mml:mn> <mml:mo><</mml:mo> <mml:mi>a</mml:mi> <mml:mo>≪</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> and $$0<qll 1$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>0</mml:mn> <mml:mo><</mml:mo> <mml:mi>q</mml:mi> <mml:mo>≪</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> . It is observed that the radii of the null circular orbits increase as the values of the parameters a and q increase. While in the case of the timelike geodesics, the radii of the circular orbits increase as the value of the parameter a increases, and they decrease as the value of the parameter q increases." @default.
• W3161613228 created "2021-05-24" @default.
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• W3161613228 date "2021-05-01" @default.
• W3161613228 modified "2023-10-16" @default.
• W3161613228 title "Radial and circular motion of photons and test particles in the Schwarzschild black hole with quintessence and string clouds" @default.
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• W3161613228 doi "https://doi.org/10.1140/epjc/s10052-021-09195-5" @default.
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