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arXiv 1407.3697gr-qcastro-ph.HE
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粒子在旋转规则黑洞周围的运动和碰撞

Particle motion and collisions around rotating regular black hole

Bobir Toshmatov, Ahmadjon Abdujabbarov, Bobomurat Ahmedov, Zdenek Stuchlík

摘要:

研究了在前一篇论文[Phys. Rev. D 89,104017,(2014)]中利用Newman-Janis算法从Ayón-Beato-García黑洞解导出的中性粒子绕旋转规则黑洞的运动.给出了旋转规则黑洞的沿测地线的最内层稳定圆轨道和不稳定轨道与黑洞电荷值的关系。研究了旋转规则黑洞通过各种过程的能量提取。基于BSW(Bettencesados-Silk-West)机制,我们得到了来自无穷远的中性粒子碰撞的质心能量表达式。旋转规则黑洞的电荷$Q$降低了引力场的势,粒子在圆测地线上需要的束缚能也减少了。这使得在存在来自旋转规则黑洞的电荷$Q$的情况下,通过BSW过程的能量提取效率增加。结果表明,旋转规则黑洞通过Penrose过程提取能量的效率随着电荷$Q$的增加而降低,与具有特定角动量$a=1$的极端Kerr黑洞的20.7%相比,效率更小.

英文摘要:

The neutral particle motion around rotating regular black hole that was derived from the Ayón-Beato-García black hole solution by the Newman-Janis algorithm in the preceding paper [Phys. Rev. D 89, 104017, (2014)] has been studied. The dependencies of the ISCO (innermost stable circular orbits along geodesics) and unstable orbits on the value of the electric charge of the rotating regular black hole have been shown. Energy extraction from the rotating regular black hole through various processes has been examined. We have found expression of the center of mass energy for the colliding neutral particles coming from infinity, based on the BSW (Baňados-Silk-West) mechanism. The electric charge $Q$ of rotating regular black hole decreases the potential of the gravitational field and the particle needs less bound energy at the circular geodesics. This causes the increase of efficiency of the energy extraction through BSW process in the presence of the electric charge $Q$ from rotating regular black hole. It has been shown that the efficiency of the energy extraction from the rotating regular black hole via the Penrose process decreases with the increase of the electric charge $Q$ and is smaller with compare to 20.7% which is the value for the extreme Kerr black hole with the specific angular momentum $a=1$.

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