论文标题
FRB的定期快速无线电爆发，来自强迫进攻的中子星，异常扭矩和内部磁场180916.J0158+65和FRB 121102
Periodic fast radio bursts from forcedly precessing neutron stars, anomalous torque, and internal magnetic field for FRB 180916.J0158+65 and FRB 121102
论文作者
论文摘要
A recent discovery of the periodic activity of the repeating fast radio burst source FRB 180916.J0158+65 in the Canadian Hydrogen Intensity Mapping Experiment (CHIME) hints at possible origin of the FRB from a freely precessing neutron star with a magnetar magnetic field of about $10^{16}$ G. However, the absence of simultaneously detected high-energy emission in the Swift and AGILE observations对田间大小施加严格的约束，并质疑这种祖先的可能性。我们表明，对中子恒星强迫进攻的考虑并没有遇到困难。即使中子恒星没有变形，也会发生这种进动，并且是由恒星旋转引起的电磁力的异常力矩带来的，并由非核电流确定。与旋转电流的预期相反，通过直接方法计算的异常扭矩似乎不是零。如果观察到的16.35天的周期对应于恒星进动期间，则推断的内部磁场似乎约为$ 6 \ times10^{14} $ g，旋转周期为1 s。对于另一个可能的周期性FRB 121102，磁场甚至更低，$ 2 \ times10^{14} $ g，从而证明了早期的考虑合理性，而不是从预启动中子星来排除FRB来源的假设。
A recent discovery of the periodic activity of the repeating fast radio burst source FRB 180916.J0158+65 in the Canadian Hydrogen Intensity Mapping Experiment (CHIME) hints at possible origin of the FRB from a freely precessing neutron star with a magnetar magnetic field of about $10^{16}$ G. However, the absence of simultaneously detected high-energy emission in the Swift and AGILE observations imposes stringent constraints on the field magnitude and questions the possibility of such a progenitor. We show that consideration of forced precession of a neutron star does not encounter the difficulty. This kind of precession takes place even if the neutron star is not deformed and is brought about by the anomalous moment of electromagnetic forces induced by stellar rotation and determined by non-corotational currents. Contrary to what is expected for the currents of corotation, the anomalous torque calculated by the direct method appears to be non-zero. If the observed 16.35-day period corresponds to the period of stellar precession, the inferred internal magnetic field appears to be about $6\times10^{14}$ G for rotational period 1 s. For another possibly periodic FRB 121102 with 157-day period the magnetic field is even lower, $2\times10^{14}$ G, thereby justifying earlier considerations and not ruling out the hypothesis of FRB origin from precessing neutron stars.
