论文标题
QCD轴上质量，redux上的宇宙学结合
Cosmological Bound on the QCD Axion Mass, Redux
论文作者
论文摘要
我们在混合热的暗物质方案中重新审视关节限制，其中热产生的QCD轴和存在遗物中微子。在通过文献的最新进展来重新计算宇宙学的丰度后，我们改善了最新的分析，并提供了有关斧头和中微子质量的更新界限。通过避免使用近似方法，例如瞬时解耦近似以及由于QCD中扰动方法的有效性有限而引起的局限性，该方法被迫人为地将约束与轴突 - 抑制因素与轴突 - 振动符的生产通道划分，我们发现了强大的和自稳定的限制。我们研究了两个最受欢迎的轴心框架：KSVZ和DFSZ。从大爆炸核合成（BBN）的光元素丰度数据中，我们找到了KSVZ轴$Δn_ {\ rm eff} <0.31 $和Axion质量限制$ M_A <0.53 $ eV（即，在轴衰减上限制了$ f_a> 1.07 \ 1.07 \ times 10^7 $ g的$ f_a bongion dy $ g $ g $ 95 $ 95 $ 95。如果假定这些BBN边界的提高到$ΔN_ {\ rm eff} <0.14 $和$ m_a <0.16 $ eV（$ f_a> 3.56 \ times 10^7 $ GEV），则假定是从宇宙微波背景（CMB）的Baryon Energy密度上的先前数据。 When instead considering cosmological observations from the CMB temperature, polarization and lensing from the Planck satellite combined with large scale structure data we find $ΔN_{\rm eff}<0.23$, $m_a< 0.28$ eV ($f_a > 2.02 \times 10^7$ GeV) and $\sum m_ν< 0.16$ eV at $95\%$ CL.相对于现有限制，这大约对应于轴法质量的$ 5 $改善。 DFSZ轴是获得非常相似的结果。我们还预测未来CMB和Galaxy调查的观察结果即将进行，这表明它们可以达到$ M_A \ SIM 1 $ EV的百分比错误。
We revisit the joint constraints in the mixed hot dark matter scenario in which both thermally produced QCD axions and relic neutrinos are present. Upon recomputing the cosmological axion abundance via recent advances in the literature, we improve the state-of-the-art analyses and provide updated bounds on axion and neutrino masses. By avoiding approximate methods, such as the instantaneous decoupling approximation, and limitations due to the limited validity of the perturbative approach in QCD that forced to artificially divide the constraints from the axion-pion and the axion-gluon production channels, we find robust and self-consistent limits. We investigate the two most popular axion frameworks: KSVZ and DFSZ. From Big Bang Nucleosynthesis (BBN) light element abundances data we find for the KSVZ axion $ΔN_{\rm eff}<0.31$ and an axion mass bound $m_a < 0.53 $ eV (i.e., a bound on the axion decay constant $f_a > 1.07 \times 10^7$ GeV) both at $95\%$ CL. These BBN bounds are improved to $ΔN_{\rm eff}<0.14$ and $m_a< 0.16$ eV ($f_a > 3.56 \times 10^7$ GeV) if a prior on the baryon energy density from Cosmic Microwave Background (CMB) data is assumed. When instead considering cosmological observations from the CMB temperature, polarization and lensing from the Planck satellite combined with large scale structure data we find $ΔN_{\rm eff}<0.23$, $m_a< 0.28$ eV ($f_a > 2.02 \times 10^7$ GeV) and $\sum m_ν< 0.16$ eV at $95\%$ CL. This corresponds approximately to a factor of $5$ improvement in the axion mass bound with respect to the existing limits. Very similar results are obtained for the DFSZ axion. We also forecast upcoming observations from future CMB and galaxy surveys, showing that they could reach percent level errors for $m_a\sim 1$ eV.
