Is there a supernova bound on axions?
Is there a supernova bound on axions?
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DOI：
10.1103/physrevd.101.123025
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发表时间：
2020-06-22
影响因子：
5
通讯作者：
D'Amico, Guido
中科院分区：
文献类型：
--
作者：
Bar, Nitsan;Blum, Kfir;D'Amico, Guido
我们提出了SN1987A超新星在轴子和其他轻粒子上的冷却约束的关键评估。文献中用于证实计算中省略的原中子星（PNS）外包络界的核心坍缩模拟。因此，在这些模拟中，中微子的唯一来源是一个冷却的PNS。我们表明，如果标准延迟中微子机制未能爆炸SN1987A，并且如果坍缩前的恒星在旋转，那么将形成一个吸积盘，可以解释晚时间（t大于或类似于5秒）中微子事件。如果SN1987A是一个坍缩引起的热核爆炸，那么这样的吸积盘将是一个自然的特征。轴子不会冷却磁盘，也不会影响它的中微子输出，前提是磁盘对中微子来说是光学薄的，就像它自然的那样。这些考虑使人们对超新星冷却界产生了怀疑。
We present a critical assessment of the SN1987A supernova cooling bound on axions and other light particles. Core collapse simulations used in the literature to substantiate the bound omitted from the calculation the envelope exterior to the proto-neutron star (PNS). As a result, the only source of neutrinos in these simulations was, by construction, a cooling PNS. We show that if the canonical delayed neutrino mechanism failed to explode SN1987A, and if the precollapse star was rotating, then an accretion disk would form that could explain the late-time (t greater than or similar to 5 sec) neutrino events. Such accretion disk would be a natural feature if SN1987A was a collapse-induced thermonuclear explosion. Axions do not cool the disk and do not affect its neutrino output, provided the disk is optically thin to neutrinos, as it naturally is. These considerations cast doubt on the supernova cooling bound.