Constraints on primordial non-Gaussianity from galaxy-CMB lensing cross correlation
- Department of Physics, Nagoya University, Chikusa-ku, Nagoya, 464-8602 (Japan)
- Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Chikusa-ku, Nagoya, 464-8602 (Japan)
Recent studies have shown that the primordial non-Gaussianity affects the clustering of dark matter halos through a scale-dependent bias, and various constraints on the non-Gaussianity through this scale-dependent bias have been placed. Here, we introduce the cross correlation between the CMB lensing potential and the galaxy angular distribution to effectively extract information about the bias from the galaxy distribution. Then, we estimate the error of the nonlinear parameter, f{sub NL}, for the ongoing CMB experiments and galaxy surveys, such as Planck and Hyper Suprime-Cam. We found that for the constraint on f{sub NL} with Planck and Hyper Suprime-Cam, the wide field galaxy survey is preferable to the deep one, and the expected error on f{sub NL} can be as small as {Delta}f{sub NL{approx}}80 for b{sub 0}=2 and {Delta}f{sub NL{approx}}30 for b{sub 0}=4, where b{sub 0} is the linear bias parameter. It is also found that a future wide field galaxy survey could achieve {Delta}f{sub NL{approx}}5 with cosmic microwave background prior to Planck, if one could observe highly biased objects at higher redshift (z{approx}2).
- OSTI ID:
- 21415219
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
79 ASTRONOMY AND ASTROPHYSICS
ANGULAR DISTRIBUTION
COMPUTER-AIDED MANUFACTURING
CORRELATIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
GALAXIES
GRAVITATIONAL LENSES
LENSES
MANUFACTURING
MATTER
MICROWAVE RADIATION
NONLINEAR PROBLEMS
NONLUMINOUS MATTER
RADIATIONS
RED SHIFT
RELICT RADIATION