论文标题
Pulsar定时阵列数据集中的域壁的重力波
Gravitational Waves from Domain Walls in Pulsar Timing Array Datasets
论文作者
论文摘要
我们提出了与模型无关的搜索，以搜索来自宇宙域壁（DWS）的重力波背景12。5年12。5年数据集和国际PTA数据发行版2. dws在温度下ni灭$ \ sim 20-50〜 \ sim 20-50〜 \ sim 20-50〜 \ text {mev} $ \ sim $ \ sim a as as as as as as as as as as as as as as as a as as as as as as as fit a as flovistack重大。超级黑洞合并的天体物理背景。 DWS可能会腐烂到标准模型（SM）或黑暗部门。在后一种情况下，我们预测深色辐射的丰度$Δn_{\ text {eff}} $在即将进行的CMB调查的范围内。如果存在与SM的耦合，则可能会出现在山脉和实验室的互补签名。例如，我们讨论了繁重的轴心场景，QCD禁闭可能会引起DW歼灭。
We present a model-independent search for the gravitational wave background from cosmic domain walls (DWs) in the NANOGrav 12.5 years dataset and International PTA Data Release 2. DWs that annihilate at temperatures $\sim 20-50~\text{MeV}$ with tensions $\sim (40-100~\text{TeV})^3$ provide as good a fit to both datasets as the astrophysical background from supermassive black hole mergers. DWs may decay into the Standard Model (SM) or a dark sector. In the latter case we predict an abundance $ΔN_{\text{eff}}$ of dark radiation well within the reach of upcoming CMB surveys. Complementary signatures at colliders and laboratories can arise if couplings to the SM are present. As an example, we discuss heavy axion scenarios, where DW annihilation may interestingly be induced by QCD confinement.
