论文标题
引力波和黑暗相变的深色辐射：连接纳米级脉冲星的时序数据和哈勃张力
Gravitational Waves and Dark Radiation from Dark Phase Transition: Connecting NANOGrav Pulsar Timing Data and Hubble Tension
论文作者
论文摘要
Nanograv协作报告的最新PULSAR时正时数据可能表明存在$ f \ sim 10^{ - 8} $ Hz附近存在随机重力波背景。我们探索了从黑暗扇区过渡产生如此低频引力波的可能性。假设除了通过重力相互作用，我们发现黑暗部门完全与可见的扇形脱钩，我们发现应该保留一定数量的黑辐射直到存在为止。 Nanograv数据表明，暗辐射的量接近当前的上限，这可能有助于减轻所谓的哈勃张力。如果未来的CMB-S4实验中未确认黑暗辐射的存在，这将意味着在O（1-100）MEV的能量尺度上与标准模型部门脆弱地相互作用。
Recent pulsar timing data reported by the NANOGrav collaboration may indicate the existence of a stochastic gravitational wave background around $f \sim 10^{-8}$ Hz. We explore a possibility to generate such low-frequency gravitational waves from a dark sector phase transition. Assuming that the dark sector is completely decoupled from the visible sector except via the gravitational interaction, we find that some amount of dark radiation should remain until present. The NANOGrav data implies that the amount of dark radiation is close to the current upper bound, which may help mitigate the so-called Hubble tension. If the existence of dark radiation is not confirmed in the future CMB-S4 experiment, it would imply the existence of new particles feebly interacting with the standard model sector at an energy scale of O(1-100) MeV.
