Parameter extraction by Planck for a cold dark matter model with broken scale invariance and cosmological constant
Parameter extraction by Planck for a cold dark matter model with broken scale invariance and cosmological constant
复制标题
普朗克对具有破坏尺度不变性和宇宙学常数的冷暗物质模型的参数提取
DOI：
10.1046/j.1365-8711.1999.02186.x
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发表时间：
1998
影响因子：
4.8
通讯作者：
D. Polarski
中科院分区：
文献类型：
--
作者：
J. Lesgourgues;J. Lesgourgues;S. Prunet;D. Polarski
我们考虑一类空间平坦的冷暗物质（CDM）模型，宇宙学常数和破尺度不变（BSI）阶跃状原始谱的绝热扰动，以前发现是非常好的协议与观测。执行Fisher矩阵分析，我们表明，在一个大的引力波（GW）的贡献的情况下，我们的BSI模型的一些自由参数（定义的步骤）可以提取显着的精度由普朗克卫星，由于偏振各向异性测量。此外，尽管自由参数的数量比最简单的暴胀模型要多，宇宙学参数仍然可以很精确地找到。
We consider a class of spatially flat cold dark matter (CDM) models, with a cosmological constant and a broken-scale-invariant (BSI) steplike primordial spectrum of adiabatic perturbations, previously found to be in very good agreement with observations. Performing a Fisher matrix analysis, we show that in case of a large gravitational waves (GW) contribution some free parameters (defining the step) of our BSI model can be extracted with remarkable accuracy by the Planck satellite, thanks to the polarisation anisotropy measurements. Further, cosmological parameters can still be found with very good precision, despite a larger number of free parameters than in the simplest inflationary models.