期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 479, 期 1, 页码 162-170出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1430
关键词
methods: numerical; large-scale structure of Universe
资金
- DFG [SFB-Transregio TR33]
- European Research Council [ERC-2015-STG 678652]
In this paper we carry out anisotropic, 'separate universe' simulations by including a large-scale tidal field in the N-body code GADGET4 using an anisotropic expansion factor A(ij). We use the code in a pure particle -mesh mode to simulate the evolution of 16 realizations of an initial density field with and without a large-scale tidal field, which are then used to measure the response function describing how the tidal field influences structure formation in the linear and non-linear regimes. Together with the previously measured response to a large scale overdensity, this completely describes the non-linear matter bispectrum in the squeezed limit. We find that, contrary to the density response, the tidal response never significantly exceeds the large-scale perturbation-theory prediction even on non-linear scales for the redshift range we discuss, We develop a simple halo model that takes into account the effect of the tidal field and compare it with our direct measurement from the anisotropic N-body simulations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据