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arXiv 1607.05063gr-qc
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两个一般粒子围绕旋转规则海沃德黑洞的碰撞

Collision of two general particles around a rotating regular Hayward's black holes

Muhammed Amir, Fazlay Ahmed, Sushant G. Ghosh

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16 pages, 4 figures, 1 table
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摘要：

旋转的规则海沃德时空，除了质量（$M$）和角动量（$a$），由于磁荷，还有一个额外的偏差参数（$g$），当$g\neq0$和$g=0$时，它推广到克尔黑洞。我们分析的ergoregion是如何影响的参数$g$显示，ergoregion的面积增加，随着$g$值的增加。此外，对于每个$g$，都存在一个临界$a_E$，它对应于一个具有退化视界$r=r^E_H$的规则极值黑洞，并且随着参数$g$的增大，PDMATHAMR减小，而$r^E_H$增大. Ban{dos，Silk和West（BSW）证明了当两个粒子在视界附近发生碰撞时，极端克尔黑洞可以充当具有任意高质心能量（$E_{CM}$）的粒子加速器。本文研究了两个不同静止质量的粒子在极端海沃德黑洞赤道面上运动的BSW过程，当其中一个粒子的角动量取一个临界值时，两个粒子的$E_{CM}$是任意高的.对于非极值情形，$E_{CM}$总是存在一个有限的上界，它随偏差参数$g$的增大而增大。在$g \rightarrow 0$极限下，我们的结果退化为Kerr黑洞的结果.

英文摘要：

The rotating regular Hayward's spacetime, apart from mass ($M$) and angular momentum ($a$), has an additional deviation parameter ($g$) due to the magnetic charge, which generalizes the Kerr black hole when $g\neq0$, and for $g=0$, it goes over to the Kerr black hole. We analyze how the ergoregion is affected by the parameter $g$ to show that the area of ergoregion increases with increasing values of $g$. Further, for each $g$, there exist critical $a_E$, which corresponds to a regular extremal black hole with degenerate horizons $r=r^E_H$, and $a_E$ decrease whereas $r^E_H$ increases with an increase in the parameter $g$. Ban{ã}dos, Silk and West (BSW) demonstrated that the extremal Kerr black hole can act as a particle accelerator with arbitrarily high center-of-mass energy ($E_{CM}$) when the collision of two particles takes place near the horizon. We study the BSW process for two particles with different rest masses, $m_1$ and $m_2$, moving in the equatorial plane of extremal Hayward's black hole for different values of $g$, to show that $E_{CM}$ of two colliding particles is arbitrarily high when one of the particles takes a critical value of angular momentum. For a nonextremal case, there always exist a finite upper bound for the $E_{CM}$, which increases with the deviation parameter $g$. Our results, in the limit $g \rightarrow 0$, reduces to that of the Kerr black hole.

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