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arXiv 2110.03362hep-phastro-ph.HE
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中子星通过核子-核子韧致辐射产生暗规范玻色子

Dark gauge boson production from neutron stars via nucleon-nucleon bremsstrahlung

Chang Sub Shin, Seokhoon Yun

摘要:

讨论了中子星通过核子-核子韧致辐射的暗规范玻色子辐射。通过对有效场论公式和热效应的严格处理,我们导出了介质中暗规范玻色子与强子的相应耦合。作为一个具体的例子,$U(1)_{\rm B-L}$规范玻色子的情况下,选择调查暗规范玻色子发射率在超新星和冷却的年轻中子星。从恒星冷却的观点出发,我们得到了SN 1987 A超新星中微子信号持续时间和SN 1987 A残骸中致密天体(NS 1987 A)的x射线光度两个观测值对给定规范玻色子质量的$\rm B-L$规范耦合的约束。特别是,从SN 1987 A上的$U(1)_{\rm B-L}$规范玻色子的情况下的约束被重新访问。由于横向偏振的发射而排除的规范耦合比以前的推导提高了一个数量级。也有一个新排除的参数空间,由于纵向偏振的发射。

英文摘要:

We discuss the dark gauge boson emission from neutron stars via nucleon-nucleon bremsstrahlung. Through the rigorous treatment of the effective field theory prescription and the thermal effect, we derive the relevant couplings of dark gauge bosons to hadrons in medium. As a specific example, the $U(1)_{\rm B-L}$ gauge boson scenario is chosen to investigate dark gauge boson emissivities during supernovae and cooling of young neutron stars. From the stellar cooling argument, we obtain the constraints on the $\rm B-L$ gauge coupling for given gauge boson masses in two observations: the duration of the supernova neutrino signal of SN1987A, and the inferred x-ray luminosity of the compact object in the remnant of SN1987A (NS1987A). In particular, the constraint from SN1987A on the $U(1)_{\rm B-L}$ gauge boson scenario is revisited. The excluded gauge coupling due to the emission of transverse polarizations is an order of magnitude enhanced compared to the previous derivation. There is also a newly excluded parameter space due to the emission of longitudinal polarizations.

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