Small scale cosmic microwave background anisotropies as a probe of the geometry of the universe
Small scale cosmic microwave background anisotropies as a probe of the geometry of the universe
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小尺度宇宙微波背景各向异性作为宇宙几何形状的探针
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
N. Sugiyama
中科院分区：
文献类型：
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作者：
M. Kamionkowski;D. Spergel;N. Sugiyama
我们进行了详细的计算宇宙微波背景（CMB）各向异性在冷暗物质（CDM）为主的开放宇宙与原始绝热密度扰动的各种再电离历史。宇宙微波背景辐射的各向异性主要取决于宇宙的几何形状，在物质主导的宇宙中，宇宙的几何形状由Ω和最后散射表面的光学深度决定。特别地，主多普勒峰上的位置主要取决于Ω，并且对其它未知参数（例如Ω（sub B）、h、λ和功率谱的形状）相当不敏感。因此，如果原始密度扰动是绝热的，那么小尺度上的CMB各向异性的测量可以用来确定Ω。
We perform detailed calculations of cosmic microwave background (CMB) anisotropies in a cold dark matter (CDM)-dominated open universe with primordial adiabatic density perturbations for a variety of reionization histories. The CMB anisotropies depend primarily on the geometry of the universe, which in a matter-dominated universe is determined by Omega and the optical depth to the surface of last scattering. In particular, the location on the primary Doppler peak depends primarily on Omega and is fairly insensitive to the other unknown parameters, such as Omega(sub b), h, Lambda, and the shape of the power spectrum. Therefore, if the primordial density perturbations are adiabatic, measurements of CMB anisotropies on small scales may be used to determine Omega.