非线性功率谱的广义相对论效应
General relativistic effects on non-linear power spectra
摘要:
爱因斯坦方程的非线性性质使描述宇宙学扰动演化的牛顿流体方程具有真正的相对论高阶修正。我们研究了这种新的非线性的影响下,以领先的顺序物质和速度功率谱的情况下,无压,无旋流体在一个平坦的弗里德曼背景。我们发现,纯广义相对论的修正是可以忽略不计的小在所有的尺度。我们的结果保证,在目前的标准宇宙学范式,人们可以安全地使用牛顿宇宙学,即使在非线性制度。
英文摘要:
Non-linear nature of Einstein equation introduces genuine relativistic higher order corrections to the usual Newtonian fluid equations describing the evolution of cosmological perturbations. We study the effect of such novel non-linearities on the next-to-leading order matter and velocity power spectra for the case of pressureless, irrotational fluid in a flat Friedmann background. We find that pure general relativistic corrections are negligibly small over all scales. Our result guarantees that, in the current paradigm of standard cosmology, one can safely use Newtonian cosmology even in non-linear regimes.
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