Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles
Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles
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DOI：
10.1088/1475-7516/2015/02/006
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发表时间：
2014-10
影响因子：
6.4
通讯作者：
A. Payez;Carmelo Evoli;T. Fischer;M. Giannotti;A. Mirizzi;A. Ringwald
中科院分区：
文献类型：
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作者：
A. Payez;Carmelo Evoli;T. Fischer;M. Giannotti;A. Mirizzi;A. Ringwald
我们从超新星SN 1987 A的超轻类轴子粒子（ALP）的耦合光子的约束进行了修订。在核心坍缩的超新星中，ALP将通过Primakoff过程发射出来，并最终在银河系的磁场中转化为伽马射线。在SMM卫星的GRS仪器中缺乏伽马射线信号，与SN 1987 A发射的中微子的观测一致，因此提供了它们与光子耦合的强约束。由于与电流约束相关的较大不确定性，我们根据超新星模型和Milky-Way磁场的最新物理输入修改了这一论点。此外，我们提供了重大的修订，如一致的治疗核子简并效应和减少的核质量在热和稠密的核介质的超新星。在此基础上，我们得到了一个新的光子-ALP耦合上限：gaγ = 5.3 × 10 ~（-12）GeV ~（-1），ma = 4.4 × 10 ~（-10）eV，并给出了它与ALP质量ma的关系.此外，我们还讨论了在不久的将来，如果一颗足够近的超新星爆炸，费米-LAT卫星实验可以在多大程度上改善这个界限。
We revise the bound from the supernova SN1987A on the coupling of ultralight axion-like particles (ALPs) to photons. In a core-collapse supernova, ALPs would be emitted via the Primakoff process, and eventually convert into gamma rays in the magnetic field of the Milky Way. The lack of a gamma-ray signal in the GRS instrument of the SMM satellite in coincidence with the observation of the neutrinos emitted from SN1987A therefore provides a strong bound on their coupling to photons. Due to the large uncertainty associated with the current bound, we revise this argument, based on state-of-the-art physical inputs both for the supernova models and for the Milky-Way magnetic field. Furthermore, we provide major amendments, such as the consistent treatment of nucleon-degeneracy effects and of the reduction of the nuclear masses in the hot and dense nuclear medium of the supernova. With these improvements, we obtain a new upper limit on the photon-ALP coupling: gaγ ≲ 5.3 × 10-12 GeV-1, for ma ≲ 4.4 × 10-10 eV, and we also give its dependence at larger ALP masses ma. Moreover, we discuss how much the Fermi-LAT satellite experiment could improve this bound, should a close-enough supernova explode in the near future.