Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-04-27
Res.Astron.Astrophys.10:107-115,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
8 pages, 2 figures, RAA accepted
Scientific paper
10.1088/1674-4527/10/2/001
The primordial non-Gaussianity (PNG) in 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 on 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 different magnitude limits are considered. We find that the MAIN1 sample (i.e. the main galaxy survey with one magnitude deeper than the SDSS main galaxy survey, or r<18.8) could only provide very weak constraint on PNG. For the MAIN2 sample (r<19.8) and the LRG survey, the 2\sigma (95.5%) limit on the PNG parameter f_{NL} are |f_{NL}|<145 and |f_{NL}|<114 respectively, comparable to the current limit from cosmic microwave background (CMB) data. The quasar survey could provide much more stringent constraint, and we find that the 2\sigma limit for |f_{NL}| 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 constraints to |f_{NL}|<43 (2\sigma). We also discuss the possibility of further tightening the constraint by using the relative bias method proposed by Seljak(2008).
Chen Xuelei
Gong Yan
Wang Xin
Zheng Zheng
No associations
LandOfFree
Primordial Non-Gaussianity from LAMOST Surveys does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Primordial Non-Gaussianity from LAMOST Surveys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Primordial Non-Gaussianity from LAMOST Surveys will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-712467