Einstein's legacy in galaxy surveys

被引:62
|
作者
Camera, Stefano [1 ,2 ]
Maartens, Roy [3 ,4 ]
Santos, Mario G. [2 ,3 ,5 ]
机构
[1] Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England
[2] Univ Lisbon, Inst Super Tecn, CTR, P-1049001 Lisbon, Portugal
[3] Univ Western Cape, Dept Phys, ZA-7535 Cape Town, South Africa
[4] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England
[5] Square Kilometre Array SA, ZA-7405 Cape Town, South Africa
基金
欧洲研究理事会; 新加坡国家研究基金会;
关键词
relativistic processes; cosmological parameters; cosmology: observations; early Universe; large-scale structure of the universe; radio lines: galaxies; PRIMORDIAL NON-GAUSSIANITY;
D O I
10.1093/mnrasl/slv069
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Non-Gaussianity in the primordial fluctuations that seeded structure formation produces a signal in the galaxy power spectrum on very large scales. This signal contains vital information about the primordial Universe, but it is very challenging to extract, because of cosmic variance and large-scale systematics - especially after the Planck experiment has already ruled out a large amplitude for the signal. Whilst cosmic variance and experimental systematics can be alleviated by the multitracer method, we here address another systematic - introduced by not using the correct relativistic analysis of the power spectrum on very large scales. In order to reduce the errors on f(NL), we need to include measurements on the largest possible scales. Failure to include the relativistic effects on these scales can introduce significant bias in the best-fit value of f(NL) from future galaxy surveys.
引用
收藏
页码:L80 / L84
页数:5
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