Cosmology with recombination spectrum
Cosmology with recombination spectrum
复制标题
复合谱宇宙学
DOI：
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发表时间：
2019
影响因子：
6.4
通讯作者：
R. Khatri
中科院分区：
文献类型：
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作者：
D. Sarkar;R. Khatri
精确测量宇宙复合光谱可以为观察早期宇宙提供一个全新的窗口。我们的目标是量化隐藏在宇宙学复合谱中的信息，为此，我们已经开发了一个新的代码后，在[1，2]中提出的算法。我们的代码是基于COSMOSPEC [3]代码的。我们发现，使用Fisher信息矩阵，并假设前景可以通过使用更高或更低的频率通道和空间信息来减去，与拟议的实验PIXIE相比，超出检测将需要灵敏度为25倍的实验。这样的实验将能够测量宇宙学参数，其精度与CMB各向异性实验具有竞争力。最好的约束参数是重子能量密度，ΩB，它可以在原则上以令人难以置信的精度确定下来。我们还表明，氢线的形状连接到氢复合的速度，与复合线的峰值重合的复合率的峰值。一般来说，谱线的形状编码了关于作为红移函数的重组率的信息。
Precision measurement of the cosmological recombination spectrum can provide an entire new window to look at the early universe. We aim to quantify the information hidden in the cosmological recombination spectrum and for this purpose we have developed a new code following the algorithm proposed in [1,2]. Our code is closely based on the COSMOSPEC [3] code. We find, using Fisher information matrix and assuming that the foregrounds can be subtracted by using higher or lower frequency channels and spatial information, that going beyond the detection will need an experiment with sensitivity 25× better compared to the proposed experiment PIXIE. Such an experiment will be able to measure the cosmological parameters with a precision that is competitive with the CMB anisotropy experiments. The best constrainted parameter is baryon energy density, Ωb, which can be nailed down with incredible precision in principle. We also show that the shape of the hydrogen lines is connected to the speed of the hydrogen recombination, with the peaks of the recombination lines coinciding with the peak of the recombination rate. In general, the shape of the lines encodes information about the rate of recombination as a function of redshift.
影响因子：
6.4
作者：
Prism Collaboration Philippe Andr'e;C. Baccigalupi;A. Banday;D. Barbosa;B. Barreiro;J. Bartlett;N. Bart
通讯作者：
Prism Collaboration Philippe Andr'e;C. Baccigalupi;A. Banday;D. Barbosa;B. Barreiro;J. Bartlett;N. Bart