Revisiting Supernova 1987A constraints on dark photons
Revisiting Supernova 1987A constraints on dark photons
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DOI：
10.1007/jhep01(2017)107
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发表时间：
2016-11
影响因子：
5.4
通讯作者：
Jae Hyeok Chang;R. Essig;Samuel D. McDermott
中科院分区：
文献类型：
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作者：
Jae Hyeok Chang;R. Essig;Samuel D. McDermott
我们从超新星1987 A的观测中重新审视了质量低于100 MeV的暗光子的约束。如果暗光子产生的数量足够多，它们就会减少以中微子形式发射的能量，这与观测结果相矛盾。对于第一次，我们包括有限的温度和密度的动力学混合参数，在这种环境中，的影响。这导致暗光子质量低于15MeV时，暗光子的束缚减弱。对于足够大的λ值，暗光子可以在超新星内部被重新吸收。由于再吸收过程的速率随着暗光子能量的增加而降低，我们指出，能量高于维恩峰的暗光子可以在没有散射的情况下逃逸，从而比假设黑体光谱更容易导致能量损失。此外，我们估计系统的不确定性的冷却边界推导约束假设一个分析和四个不同的模拟温度和密度分布的原中子星星。最后，我们还估计了系统的不确定性的约束，通过改变的距离，跨越暗光子必须传播从他们的生产点，能够影响星星。这项工作澄清了SN 1987 A在暗光子参数空间上的界限。
We revisit constraints on dark photons with masses below∼ 100 MeV from the observations of Supernova 1987A. If dark photons are produced in sufficient quantity, they reduce the amount of energy emitted in the form of neutrinos, in conflict with observations. For the first time, we include the effects of finite temperature and density on the kinetic-mixing parameter, ϵ, in this environment. This causes the constraints on ϵ to weaken with the dark-photon mass below∼ 15 MeV. For large-enough values of ϵ, it is well known that dark photons can be reabsorbed within the supernova. Since the rates of reabsorption processes decrease as the dark-photon energy increases, we point out that dark photons with energies above the Wien peak can escape without scattering, contributing more to energy loss than is possible assuming a blackbody spectrum. Furthermore, we estimate the systematic uncertainties on the cooling bounds by deriving constraints assuming one analytic and four different simulated temperature and density profiles of the proto-neutron star. Finally, we estimate also the systematic uncertainty on the bound by varying the distance across which dark photons must propagate from their point of production to be able to affect the star. This work clarifies the bounds from SN1987A on the dark-photon parameter space.