论文标题
来自宇宙弦和重力波背景的深色光子暗物质
Dark Photon Dark Matter from Cosmic Strings and Gravitational Wave Background
论文作者
论文摘要
深色光子暗物质可以由宇宙弦与深色u（1）尺度对称性断裂产生。我们对Abelian-Higgs模型进行三维晶格模拟，并遵循宇宙弦的演变。特别是，我们模拟了（非常）光矢量玻色子的情况，发现这种向量玻色子是通过小环的崩溃有效产生的，而在重型载体玻色子的情况下，生产效率低下。我们计算由宇宙弦乐环为光矢量玻色子盒产生的引力背景的光谱，并在光谱中找到特征特征，该特征可以用作暗光子暗物质方案的探测。特别是，我们发现当前的基于地面的检测器可能对此类引力波信号敏感，并且持续的/未来的脉冲星时定时观察结果严格限制了深色光子暗物质方案。
Dark photon dark matter may be produced by the cosmic strings in association with the dark U(1) gauge symmetry breaking. We perform three-dimensional lattice simulations of the Abelian-Higgs model and follow the evolution of cosmic strings. In particular, we simulate the case of (very) light vector boson and find that such vector bosons are efficiently produced by the collapse of small loops while the production is inefficient in the case of heavy vector boson. We calculate the spectrum of the gravitational wave background produced by the cosmic string loops for the light vector boson case and find characteristic features in the spectrum, which can serve as a probe of the dark photon dark matter scenario. In particular, we find that the current ground-based detectors may be sensitive to such gravitational wave signals and also on-going/future pulsar timing observations give stringent constraint on the dark photon dark matter scenario.
