Chen Xuelei1; Gong Yan1; Wang Xin1; Zheng Zheng2
Source Publicationresearchinastronomyandastrophysics
AbstractThe primordial non-Gaussianity (PNG) in the matter density perturbation is a very powerful probe of the physics of the very early Universe. The local PNG can induce a distinct scale-dependent bias on the large scale structure distribution of galaxies and quasars, which could be used for constraining it. We study the detection limits of PNG from the surveys of the LAMOST telescope. The cases of the main galaxy survey, the luminous red galaxy (LRG) survey, and the quasar survey of dif- ferent magnitude limits are considered. We find that the Mainl sample (i.e. the main galaxy survey which is one magnitude deeper than the SDSS main galaxy survey, or r 〈 18.8) could only provide a very weak constraint on PNG. For the Main2 sample (r 〈 19.8) and the LRG survey, the 2or (95.5%) limits on the PNG parameter fNL are | fNL|〈 145 and | fNL| 〈 114 respectively, which are comparable to the current limit from cosmic microwave background (CMB) data. The quasar survey could provide a much more stringent constraint, and we find that the 2a limit for |fNL| is between 50 and 103, depending on the magnitude limit of the survey. With Planck-like priors on cosmological parameters, the quasar survey with g 〈 21.65 would improve the constraint to I fNLI 〈 43 (2or). We also discuss the possibility of further tightening the constraint by using the relative bias method proposed by Seljak.
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Chen Xuelei,Gong Yan,Wang Xin,et al. primordialnongaussianityfromlamostsurveys[J]. researchinastronomyandastrophysics,2010,000(002):107.
APA Chen Xuelei,Gong Yan,Wang Xin,&Zheng Zheng.(2010).primordialnongaussianityfromlamostsurveys.researchinastronomyandastrophysics,000(002),107.
MLA Chen Xuelei,et al."primordialnongaussianityfromlamostsurveys".researchinastronomyandastrophysics 000.002(2010):107.
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