The relativistic accretion onto astrophysical compact objects such as black holes and neutron stars is the natural phenomena for releasing energy, with up to 40% of the rest-mass energy of the matter accreting on the black hole able to be liberated. High luminosities due to accretion are observed in X-ray binaries, and in active galactic nuclei (AGN). In this paper, we investigate the geodesics motion and accretion process near a regular phantom black hole by taking an isothermal fluid with spherically symmetric black hole spacetime. The geodesic motion around the black hole during accretion provide the disc like structure. Here, we give some reasons to make circular orbits and accretion process for the considered black hole. Firstly, we discuss the motion of test particles with stabilities near the equatorial plane which make the circular orbits. Then we analyze perturbations via restoring forces and oscillations of particles around the central object. Finally, we discuss the critical speed of the fluid flow and maximum accretion rate. The physical validity of our results shows that the phantom parameter b plays an important role for the circular orbits and the maximum accretion rate.

中文翻译：

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常规幻影黑洞附近的圆形轨道和吸积过程

相对论吸积到黑洞和中子星等天体物理致密物体上是释放能量的自然现象，吸积在黑洞上的物质的静止质量能量高达40%能够被释放。在 X 射线双星和活动星系核 (AGN) 中观察到吸积引起的高亮度。在本文中，我们通过采用具有球对称黑洞时空的等温流体来研究规则幻影黑洞附近的测地线运动和吸积过程。吸积过程中围绕黑洞的测地线运动提供了类似圆盘的结构。在这里，我们给出了一些理由来为所考虑的黑洞制作圆形轨道和吸积过程。首先，我们讨论了在赤道平面附近做圆形轨道的具有稳定性的测试粒子的运动。然后我们通过恢复力和围绕中心物体的粒子振荡来分析扰动。最后，我们讨论了流体流动的临界速度和最大吸积率。我们结果的物理有效性表明，体模参数 b 对圆形轨道和最大吸积率起着重要作用。