论文标题
Xenon1t轴的宇宙烙印
Cosmic Imprints of XENON1T Axions
论文作者
论文摘要
Xenon1t观察到的最近的电子后坐力过剩，就与电子耦合的太阳轴有关。如果此类轴在重组时仍然是相对论的，他们还将以额外的辐射分量的形式留下宇宙烙印，该形式由有效的中微子数字$Δn_\ text {eff} $参数化。我们在未来的CMB调查中探索了最小的情况，并具有可检测的信号：轴是由民主耦合到所有费米子，辐射产生的轴 - 电子耦合，QCD轴的DFSZ框架。预测的$Δn_\ text {eff} $在所有情况下大于$ 0.03-0.04 $，接近CMB-S4实验的$2σ$预测灵敏度。这打开了宇宙学观察结果测试的可能性。
The recent electron recoil excess observed by XENON1T has a possible interpretation in terms of solar axions coupled to electrons. If such axions are still relativistic at recombination they would also leave a cosmic imprint in the form of an additional radiation component, parameterized by an effective neutrino number $ΔN_\text{eff}$. We explore minimal scenarios with a detectable signal in future CMB surveys: axions coupled democratically to all fermions, axion-electron coupling generated radiatively, the DFSZ framework for the QCD axion. The predicted $ΔN_\text{eff}$ is larger than $0.03-0.04$ for all cases, close to the $2σ$ forecasted sensitivity of CMB-S4 experiments. This opens the possibility of testing with cosmological observations the solar axion interpretation of the XENON1T excess.
