论文标题
大型星系簇，例如“ El Gordo”提示原始量子扩散
Massive galaxy clusters like "El Gordo'' hint at primordial quantum diffusion
论文作者
论文摘要
通常在标准宇宙学模型中假定初始密度扰动在所有尺度上都是高斯。然而，原始量子扩散不可避免地会在通货膨胀扰动的分布中产生非高斯的指数尾巴。这些指数尾巴对宇宙中倒塌结构的形成有直接的后果，正如在原始黑洞的背景下所研究的那样。我们表明，这些尾巴还会影响非常大的结构，使“ El Gordo”之类的沉重集群或与宇宙微波背景冷点相关的大型空隙，更可能。我们在指数尾巴的存在下计算光环质量函数和簇丰度作为红移的函数。我们发现，量子扩散通常会扩大重簇和耗尽Subhalos的数量，这种效果无法被著名的$ f _ {\ mathrm {nl}} $更正捕获。因此，这些晚期的签名可能是通货膨胀期间量子动态的指纹，应将其纳入$ n $ body的模拟中，并根据天体物理数据进行检查。
It is generally assumed within the standard cosmological model that initial density perturbations are Gaussian at all scales. However, primordial quantum diffusion unavoidably generates non-Gaussian, exponential tails in the distribution of inflationary perturbations. These exponential tails have direct consequences for the formation of collapsed structures in the universe, as has been studied in the context of primordial black holes. We show that these tails also affect the very-large-scale structures, making heavy clusters like "El Gordo", or large voids like the one associated with the cosmic microwave background cold spot, more probable. We compute the halo mass function and cluster abundance as a function of redshift in the presence of exponential tails. We find that quantum diffusion generically enlarges the number of heavy clusters and depletes subhalos, an effect that cannot be captured by the famed $f_{\mathrm{NL}}$ corrections. These late-universe signatures could thus be fingerprints of quantum dynamics during inflation that should be incorporated in $N$-body simulations and checked against astrophysical data.
