ΛCDM Cosmology for Astronomers
ΛCDM Cosmology for Astronomers
复制标题
天文学家的 ΛCDM 宇宙学
DOI：
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发表时间：
2018
影响因子：
3.5
通讯作者：
U. Virginia
中科院分区：
文献类型：
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作者：
J. Condon;A. N. R. A. Observatory;U. Virginia
宇宙微波背景辐射观测所青睐的均匀、各向同性和平坦的ΛCDM宇宙只能用欧几里得几何、局部正确的牛顿力学和狭义相对论和广义相对论的基本假设来描述。我们提出了简单的推导最有用的方程连接天文观测（红移，通量密度，角直径，亮度，局部空间密度，.）与远距离源的相应固有特性（回视时间、距离、光谱光度、线性尺寸、比强度、源计数等）相关联。我们还提出了一个分析方程的回望时间是准确的0.1%以内的所有红移z。随动距离的精确方程是一个椭圆积分，必须用数值计算，但我们发现了一个简单的近似，对于所有红移到z = 50的情况，误差<0.2%。
The homogeneous, isotropic, and flat ΛCDM universe favored by observations of the cosmic microwave background can be described using only Euclidean geometry, locally correct Newtonian mechanics, and the basic postulates of special and general relativity. We present simple derivations of the most useful equations connecting astronomical observables (redshift, flux density, angular diameter, brightness, local space density, ...) with the corresponding intrinsic properties of distant sources (lookback time, distance, spectral luminosity, linear size, specific intensity, source counts, ...). We also present an analytic equation for lookback time that is accurate within 0.1% for all redshifts z. The exact equation for comoving distance is an elliptic integral that must be evaluated numerically, but we found a simple approximation with errors <0.2% for all redshifts up to z ≈ 50.
DOI：
10.17863/cam.43425
发表时间：
2016
期刊：
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影响因子：
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作者：
Aghanim N
通讯作者：
Aghanim N