MG14 - Talk detail

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We discuss the horizon structure of the rotating Kerr-like Bardeen black hole, a generalization of the most famous regular black hole due to Bardeen \cite{Bardeen:1968}, which has an additional parameter ($g$) due to magnetic charge, apart from mass ($M$) and angular momenta ($a$). Interestingly, for each $g$ with a given value of $M$, there exist a critical angular momenta ($a=a_{E}$), which corresponds to extremal black hole with degenerate horizons, while for $a<a_{E}$ describes a non-extremal black hole with two horizons, and a naked singularity for $a>a_{E}$. We find that the parameter $a_E$ is also influenced by $g$, which remarkably decreases with $g$. We also study collision of two equal mass particle near the horizon of this black hole, and explicitly bring out the effect of parameter $g$. It is demonstrated that the center-of-mass energy ($E_{CM}$) could be arbitrary high in the extremal cases, thereby suggesting that the rotating Bardeen black hole can act as a particle accelerator, and may be a suitable framework for Planck-scale physics. Our analysis, for $g=0$, goes over to the standard Kerr black hole.

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