期刊
ASTROPHYSICAL JOURNAL
卷 760, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/760/1/45
关键词
cosmological parameters; large-scale structure of universe
资金
- Japan Society for the Promotion of Science (JSPS) [23540324]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Grants-in-Aid for Scientific Research [18072005, 10J00181, 20674003, 23540324] Funding Source: KAKEN
We study the cosmological information contained in the Minkowski functionals (MFs) of weak gravitational lensing convergence maps. We show that the MFs provide strong constraints on the local-type primordial non-Gaussianity parameter f(NL). We run a set of cosmological N-body simulations and perform ray-tracing simulations of weak lensing to generate 100 independent convergence maps of a 25 deg(2) field of view for fNL = -100, 0 and 100. We perform a Fisher analysis to study the degeneracy among other cosmological parameters such as the dark energy equation of state parameter w and the fluctuation amplitude sigma(8). We use fully nonlinear covariance matrices evaluated from 1000 ray-tracing simulations. For upcoming wide-field observations such as those from the Subaru Hyper Suprime-Cam survey with a proposed survey area of 1500 deg(2), the primordial non-Gaussianity can be constrained with a level of fNL similar to 80 and w similar to 0.036 by weak-lensing MFs. If simply scaled by the effective survey area, a 20,000 deg(2) lensing survey using the Large Synoptic Survey Telescope will yield constraints of fNL similar to 25 and w similar to 0.013. We show that these constraints can be further improved by a tomographic method using source galaxies in multiple redshift bins.
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