Abstract The recent observation of an excess in the electronic recoil data by the XENON1T detector has drawn many attentions as a potential hint for an extension of the Standard Model (SM). Absorption of a vector boson with the mass of m A ′ ∈ ( 2 keV , 3 keV ) is one of the feasible explanations to the excess. In the case where the vector boson explains the dark matter (DM) population today, it is highly probable that the vector boson belongs to a class of the warm dark matter (WDM) due to its suspected mass regime. In such a scenario, providing a good fit for the excess, the kinetic mixing κ ∼ 10 − 15 asks for a non-thermal origin of the vector DM. In this letter, we consider a scenario where the gauge boson is nothing but the U ( 1 ) B − L gauge boson and its non-thermal origin is attributed to the decay of the coherently oscillating scalar of which condensation induces the spontaneous breaking of U ( 1 ) B − L . We discuss implications for the early universe physics when the warm nature of the vector DM serves as a resolution to both the small scale problems that ΛCDM model encounters and the XENON1T anomaly.

中文翻译：

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微弱相互作用的 U(1)B−L 规范玻色子暖暗物质和 XENON1T 异常

摘要 最近 XENON1T 探测器对电子反冲数据过量的观察作为扩展标准模型 (SM) 的潜在提示引起了许多关注。对质量为 m A ′ ∈ ( 2 keV , 3 keV ) 的矢量玻色子的吸收是对过量的可行解释之一。在矢量玻色子解释当今暗物质 (DM) 种群的情况下，矢量玻色子很可能由于其可疑的质量体系而属于暖暗物质 (WDM) 的一类。在这种情况下，为过剩提供良好拟合，动力学混合 κ ∼ 10 - 15 要求矢量 DM 的非热源。在这封信中，我们考虑一个场景，其中规范玻色子只不过是 U ( 1 ) B - L 规范玻色子，其非热起源归因于相干振荡标量的衰变，其中凝聚引起 U ( 1 ) B 的自发断裂- L 。当矢量 DM 的温暖性质作为 ΛCDM 模型遇到的小规模问题和 XENON1T 异常的解决方案时，我们讨论了对早期宇宙物理学的影响。