论文标题

来自宇宙密度峰的非扰动光环聚类

Non-perturbative halo clustering from cosmological density peaks

论文作者

Baldauf, Tobias, Codis, Sandrine, Desjacques, Vincent, Pichon, Christophe

论文摘要

将光环的形成位点与平滑线性密度场的最大值相关联,我们对Lagrangian和Evolved Halo相关函数提出了非扰动预测,这些函数在所有分离中都是有效的。在Lagrangian空间中,我们发现与小尺度上的扰动偏置计算有很大的偏差,特别是一个明显的排除区域,其中$ξ= -1 $对于高度不平等的最大值。我们的预测与从n体模拟重建的暗物质原始途径的拉格朗日聚类非常吻合。我们对光环的平均插入和速度分散的预测与局部偏置扩展不同,显示出与模拟的一致性水平。最后,我们根据Zeldovich的近似来取代初始密度峰,以预测暗物质光环的延迟聚类。尽管我们能够重现这组保守的示踪剂集的早期演变,但在非线性尺度上,我们的近似值在塌陷时期(z = 0)r <10mpc/h,强调了对晕晕置换场的非扰动治疗的需求。

Associating the formation sites of haloes with the maxima of the smoothed linear density field, we present non-perturbative predictions for the Lagrangian and evolved halo correlation functions that are valid at all separations. In Lagrangian space, we find significant deviations from the perturbative bias calculation at small scales, in particular, a pronounced exclusion region where $ξ=-1$ for maxima of unequal height. Our predictions are in good agreement with the Lagrangian clustering of dark matter proto-haloes reconstructed from N-body simulations. Our predictions for the mean infall and velocity dispersion of haloes, which differ from the local bias expansion, show a similar level of agreement with simulations. Finally, we displace the initial density peaks according to the Zeldovich approximation in order to predict the late-time clustering of dark matter haloes. While we are able to reproduce the early evolution of this conserved set of tracers, our approximation fails at the collapse epoch (z=0) on non-linear scales r<10Mpc/h, emphasizing the need for a non-perturbative treatment of the halo displacement field.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源