论文标题
循环校正具有全职和规模依赖性的大规模中微子宇宙学的功率谱
Loop corrections to the power spectrum for massive neutrino cosmologies with full time- and scale-dependence
论文作者
论文摘要
通过Einstein De-Sitter（EDS）宇宙学采用的近似非线性内核经常计算到功率谱的环校正。我们提出了一种算法，该算法使我们可以考虑基础流体动力学的全日制和规模依赖性，并将其应用于评估中微子自由流对1和2循环物质功率谱的影响。中微子的扰动由混合玻尔兹曼/两流体模型描述，当使用适当的有效中微子声音速度时，我们表明，在线性级别上，我们表明在线性水平上同意。然后，我们在1和2循环的情况下使用此方案对物质功率谱进行精确比较，并简化了大规模中微子的处理。对于使用冷暗物质+baryon扰动和EDS内核来计算非线性校正的通常采用的方案，我们在z = 0时发现k> 0.15 h/mpc的偏差高于1％，而在z = 0.5时弱的非线性尺度上的偏差一致性。我们还证明了ED近似对无质量中微子的2循环功率谱的影响。
Loop corrections to the power spectrum are frequently computed using approximate non-linear kernels adopted from an Einstein de-Sitter (EdS) cosmology. We present an algorithm that allows us to take the full time- and scale-dependence of the underlying fluid dynamics into account, and apply it to assess the impact of neutrino free-streaming on the 1- and 2-loop matter power spectrum. Neutrino perturbations are described by a hybrid Boltzmann/two-fluid model, that we show to agree with the CLASS Boltzmann solution at the linear level when using an appropriate effective neutrino sound velocity. We then use this scheme at 1- and 2-loop to perform a precision comparison of the matter power spectrum with simplified treatments of massive neutrinos. For a commonly adopted scheme using cold dark matter+baryon perturbations and EdS kernels to compute non-linear corrections, we find deviations above 1% for k > 0.15 h/Mpc at z=0, and sub-percent agreement on weakly non-linear scales at z=0.5. We also demonstrate the impact of the EdS approximation on the 2-loop power spectrum for massless neutrinos.
