论文标题
黑暗部门的动量转移和即将进行的星系调查中的镜头收敛
Momentum transfer in the dark sector and lensing convergence in upcoming galaxy surveys
论文作者
论文摘要
我们研究了一个宇宙学模型，该模型允许暗物质与暗能量之间的动量转移。黑暗扇区中的相互作用主要影响小尺度上扰动的行为，而背景演变与$ W $ CDM解决方案匹配。由于动量转移，这些模型有助于减轻标准模型中$σ_8$差异的差异，但不能解决所谓的$ H_0 $张力。我们确认确实是通过计算宇宙学约束的情况。虽然我们的分析倾向于偏爱$σ_8$值低于$λ$ CDM，但我们找不到证据表明黑暗扇区中的非逐步动量转移。由于即将进行的Galaxy Surveys将在允许在黑暗扇区中的动量转移的测试模型的尺度和红移中提供信息，因此我们还使用不同的调查配置进行了预测。我们评估了忽略镜头收敛$κ$的相关性，当建模数字的角度谱计数$ c_ \ ell^{\ rm ij}（z，z，z'）$。我们发现，即使包括来自其他实验的信息，也不包括$κ$在分析中会导致宇宙学参数的偏差约束（$ \ \ \ 1-5 \，σ$）。错误地建模$ C_ \ ELL^{\ rm IJ}（z，z'）$可能导致$ H_0 $和$σ_8$中的中微子质量的伪造发现和加剧差异。
We investigated a cosmological model that allows a momentum transfer between dark matter and dark energy. The interaction in the dark sector mainly affects the behaviour of perturbations on small scales while the background evolution matches the $w$CDM solution. As a result of the momentum transfer, these kinds of models help alleviating the $σ_8$ discrepancy in the standard model, but do not resolve the so-called $H_0$ tension. We confirm that this is indeed the case by computing cosmological constraints. While our analysis tends to favour $σ_8$ values lower than in $Λ$CDM, we do not find evidence for a non-vanishing momentum transfer in the dark sector. Since upcoming galaxy surveys will deliver information on scales and red-shift relevant for testing models allowing momentum transfer in the dark sector, we also carried out forecasts using different survey configurations. We assessed the relevance of neglecting lensing convergence $κ$ when modelling the angular power spectrum of number counts fluctuations $C_\ell^{\rm ij}(z,z')$. We found that not including $κ$ in analyses leads to biased constraints ($\approx 1-5\,σ$) of cosmological parameters even when including information from other experiments. Incorrectly modelling $C_\ell^{\rm ij}(z,z')$ might lead to spurious detection of neutrino masses and exacerbate discrepancies in $H_0$ and $σ_8$.
