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Marginally Stable Circular Orbits in Schwarzschild Black Hole Surrounded by Quintessence Matter


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      Marginally stable circular orbits (MSCOs) of a massive test particle are investigated in the spacetime geometry of Schwarzschild black hole surrounded by quintessence. For that matter we consider three important scenarios where the equation of state parameter \(\omega_{q}\), has one of the following forms (i) \(\omega_q=-1\) (ii) \(\omega_q=-2/3\) and (iii) \(\omega_q= -1/3\). The existence of such marginally stable circular orbits in these scenarios depend on the range of normalization factor \(\alpha\). Briefly, we show that in the first case such orbits exist only if \(0<\alpha<4/16875\). Moreover in the second case which is a special Kiselev black hole it is found that MSCOs exist when the value of the normalization factor satisfy \(0<\alpha\leq 0.00536165238\). In the last case the MSCOs are also shown to exist.

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      The evolutionary sequence of Fermi blazars


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        General relativity & Quantum cosmology


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