Perturbed redshifts from N-body simulations
Perturbed redshifts from N-body simulations
复制标题
N 体模拟引起的红移扰动
DOI：
10.1103/physrevd.97.021302
复制
发表时间：
2017
影响因子：
5
通讯作者：
J. Adamek
中科院分区：
文献类型：
--
作者：
J. Adamek
为了跟上天文测量数据质量不断提高的步伐，观测到的源红移必须在众所周知的多普勒贡献之外进行建模。在这封信中，我想研究一下当人们给用牛顿N体代码生成的模拟数据分配一个扰动的红移时，经常被掩盖的规范问题。仔细分析就会发现，修正项的存在到目前为止一直被忽视。它与观测到的长度尺度除以哈勃尺度大致成正比，因此在地平线内受到抑制。然而，在千兆秒尺度上，它可以与引力红移相媲美，因此构成了一个重要的相对论效应。
In order to keep pace with the increasing data quality of astronomical surveys the observed source redshift has to be modeled beyond the well-known Doppler contribution. In this letter I want to examine the gauge issue that is often glossed over when one assigns a perturbed redshift to simulated data generated with a Newtonian N-body code. A careful analysis reveals the presence of a correction term that has so far been neglected. It is roughly proportional to the observed length scale divided by the Hubble scale and therefore suppressed inside the horizon. However, on gigaparsec scales it can be comparable to the gravitational redshift and hence amounts to an important relativistic effect.
对 $N$ 体模拟和 Zeldovich 近似的广义相对论修正
影响因子：
5
作者：
C. Fidler;C. Rampf;T. Tram;R. Crittenden;K. Koyama ;D. Wands
通讯作者：
D. Wands