论文标题
重力门户中没有奇迹
No Miracle in Gravity Portals
论文作者
论文摘要
仅重力耦合的暗物质颗粒的概念是极简主义但可行的。假设标量曲率与暗物质标量（Gravity Portal）参考的额外$ Z_2 $ - 破坏线性耦合。 Arxiv：1603.03696和Arxiv：1611.00725声称，暗物质粒子衰减速率具有强烈的参数生长，这意味着该模型的明显现象学特征。作者归因于该特殊性是由于在最终状态中存在纵向仪的玻色子而归因于增强。不幸的是，在树级振幅中被忽略了。没有奇迹：所有扰动衰减率都被强耦合量表所抑制。
The idea of dark matter particles coupled only gravitationally is minimalist yet viable. Assuming an additional $Z_2$-breaking linear coupling of scalar curvature to the dark matter scalar (gravity portal) Refs. arXiv:1603.03696 and arXiv:1611.00725 claimed a strong parametric growth of the dark matter particle decay rate with its mass, which implies pronounced phenomenological signatures for the model. This peculiarity was attributed by the authors to the enhancement due to the presence of longitudinal gauge bosons in the final state. Quite unfortunately there were overlooked cancellations in the tree-level amplitudes. There is no miracle: all perturbative decay rates are suppressed by the strong coupling scale.
