论文标题
损坏的$ u（1）_ {\ rm b-l} $ egentore fermion暗物质
Degenerate Fermion Dark Matter from a Broken $U(1)_{\rm B-L}$ Gauge Symmetry
论文作者
论文摘要
通过假设$ u（1）_ {\ rm b-l} $规范对称性的扩展是非常有动机的，因为它自然地解释了通过seesaw机制和热瘦瘦肉发生来解释小型活性中微子质量所需的沉重右手中微子。传统上，我们介绍了三个右手中微子，以取消$ [u（1）_ {\ rm b-l}]^3 $异常。但是，出于这些目的，引入两个重型右中微子是足够的，因此我们可以用新的手性费米子替换一个右手中微子，以取消$ u（1）_ {\ rm b-l} $ gauge Anomaly。然后，手性费米斯自然可以扮演暗物质候选人的角色。在本文中，我们演示了该框架如何产生一个可以解决所谓“ Core-Cusp问题”的暗物质候选者。作为$λ$ CDM范式遇到的小规模问题之一，这可能意味着暗物质本质的重要线索。许多分辨率之一是假设矮球星系中的亚鲜属暗物质光环在（Quasi）退化构型中。我们展示了退化的子算法候选候选者如何起源于我们的模型，因此可以与Lyman-$α$森林观察一致。因此，小的中微子质量，重子不对称和子键暗物质变成破裂的B-L仪表对称性的后果。
The extension of the Standard model by assuming $U(1)_{\rm B-L}$ gauge symmetry is very well-motivated since it naturally explains the presence of heavy right-handed neutrinos required to account for the small active neutrino masses via the seesaw mechanism and thermal leptogenesis. Traditionally, we introduce three right handed neutrinos to cancel the $[U(1)_{\rm B-L}]^3$ anomaly. However, it suffices to introduce two heavy right-handed neutrinos for these purposes and therefore we can replace one right-handed neutrino by new chiral fermions to cancel the $U(1)_{\rm B-L}$ gauge anomaly. Then, one of the chiral fermions can naturally play a role of a dark matter candidate. In this paper, we demonstrate how this framework produces a dark matter candidate which can address the so-called "core-cusp problem". As one of the small scale problems that $Λ$CDM paradigm encounters, it may imply an important clue for a nature of dark matter. One of resolutions among many is hypothesizing that sub-keV fermion dark matter halos in dwarf spheroidal galaxies are in (quasi) degenerate configuration. We show how the degenerate sub-keV fermion dark matter candidate can be non-thermally originated in our model and thus can be consistent with Lyman-$α$ forest observation. Thereby, the small neutrino mass, baryon asymmetry, and the sub-keV dark matter become consequences of the broken B-L gauge symmetry.
