Caputo Andrea, Carenza Pierluca, Lucente Giuseppe, Vitagliano Edoardo, Giannotti Maurizio, Kotake Kei, Kuroda Takami, Mirizzi Alessandro
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel.
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel.
Phys Rev Lett. 2021 Oct 29;127(18):181102. doi: 10.1103/PhysRevLett.127.181102.
It was recently pointed out that very energetic subclasses of supernovae (SNe), like hypernovae and superluminous SNe, might host ultrastrong magnetic fields in their core. Such fields may catalyze the production of feebly interacting particles, changing the predicted emission rates. Here we consider the case of axionlike particles (ALPs) and show that the predicted large scale magnetic fields in the core contribute significantly to the ALP production, via a coherent conversion of thermal photons. Using recent state-of-the-art supernova (SN) simulations, including magnetohydrodynamics, we find that, if ALPs have masses m_{a}∼O(10) MeV, their emissivity in such rare but exciting conditions via magnetic conversions would be over 2 orders of magnitude larger than previously estimated. Moreover, the radiative decay of these massive ALPs would lead to a peculiar delay in the arrival times of the daughter photons. Therefore, high-statistics gamma-ray satellites can potentially discover MeV ALPs in an unprobed region of the parameter space and shed light on the magnetohydrodynamical nature of the SN explosion.
最近有人指出，超新星（SNe）中能量极高的子类，如超新星爆发和超亮超新星，其核心可能存在超强磁场。这样的磁场可能会催化弱相互作用粒子的产生，从而改变预测的发射率。在此，我们考虑类轴子粒子（ALP）的情况，并表明核心中预测的大规模磁场通过热光子的相干转换对ALP的产生有显著贡献。利用包括磁流体动力学在内的最新超新星（SN）模拟，我们发现，如果ALP的质量(m_{a}∼O(10)) 兆电子伏特，那么在这种罕见但令人兴奋的条件下，通过磁转换产生的ALP发射率将比之前估计的大两个数量级以上。此外，这些大质量ALP的辐射衰变会导致子光子到达时间出现特殊延迟。因此，高统计量的伽马射线卫星有可能在未探测的参数空间区域发现兆电子伏特的ALP，并揭示超新星爆发的磁流体动力学本质。
