磁彭罗斯过程的识别特征
The distinguishing signature of Magnetic Penrose Process
摘要：
磁彭罗斯过程（Magnetic Penrose process，MPP）的显著特点是在毫高斯量级的磁场作用下，其电磁提取旋转黑洞转动能量的效率超过了$100\%$（80年代中期建立的用于离散粒子吸积的模型）。也由电磁场驱动的另一类似过程是Blandford-Znajek机制（BZ），其可以被设想为高磁场极限MPP，因为其需要$10^4$ G级的阈值磁场。最近对完全相对论磁流体动力学流动的模拟研究证实了高磁场区过程的超高效率特征，即BZ。我们希望明确预测，类似的模拟研究低磁场区的MHD流动，其中BZ将被删除，也将有超效率。
英文摘要：
In this Letter, we wish to point out that the distinguishing feature of Magnetic Penrose process (MPP) is its super high efficiency exceeding $100\%$ (which was established in mid 1980s for discrete particle accretion) of extraction of rotational energy of a rotating black hole electromagnetically for a magnetic field of milli Gauss order. Another similar process, which is also driven by electromagnetic field, is Blandford-Znajek mechanism (BZ), which could be envisaged as high magnetic field limit MPP as it requires threshold magnetic field of order $10^4$G. Recent simulation studies of fully relativistic magnetohydrodynamic flows have borne out super high efficiency signature of the process for high magnetic field regime; viz BZ. We would like to make a clear prediction that similar simulation studies of MHD flows for low magnetic field regime, where BZ would be inoperative, would also have super efficiency.
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