21-cm background anisotropies can discern primordial non-gaussianity

被引：82
|
作者：
Cooray, Asantha [1 ]
机构：
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 26期
关键词：
D O I：
10.1103/PhysRevLett.97.261301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The non-Gaussianity of initial perturbations provides information on the mechanism that generated primordial density fluctuations. We find that 21-cm background anisotropies due to inhomogeneous neutral hydrogen distribution prior to reionization captures information on primordial non-Gaussianity better than a high-resolution cosmic microwave background anisotropy map. An all-sky 21-cm experiment over the frequency range from 14 to 40 MHz with angular information out to a multipole of 10(5) can limit the primordial non-Gaussianity parameter f(NL)less than or similar to 0.01.
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页数：4
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