TY - JOUR

T1 - Cosmological constraints from the convergence 1-point probability distribution

AU - Patton, Kenneth

AU - Blazek, Jonathan

AU - Honscheid, Klaus

AU - Huff, Eric

AU - Melchior, Peter

AU - Ross, Ashley J.

AU - Suchyta, Eric

N1 - Funding Information:
The work on this paper was supported by Department of Energy grant DE-SC0011726.
Publisher Copyright:
© 2018 The Author(s).

PY - 2017/11

Y1 - 2017/11

N2 - We examine the cosmological information available from the 1-point probability density function (PDF) of the weak-lensing convergence field, utilizing fast L-PICOLA simulations and a Fisher analysis. We find competitive constraints in the Ωm-σ8 plane from the convergence PDF with 188 arcmin2 pixels compared to the cosmic shear power spectrum with an equivalent number of modes (ℓ < 886). The convergence PDF also partially breaks the degeneracy cosmic shear exhibits in that parameter space. A joint analysis of the convergence PDF and shear 2-point function also reduces the impact of shape measurement systematics, to which the PDF is less susceptible, and improves the total figure of merit by a factor of 2-3, depending on the level of systematics. Finally, we present a correction factor necessary for calculating the unbiased Fisher information from finite differences using a limited number of cosmological simulations.

AB - We examine the cosmological information available from the 1-point probability density function (PDF) of the weak-lensing convergence field, utilizing fast L-PICOLA simulations and a Fisher analysis. We find competitive constraints in the Ωm-σ8 plane from the convergence PDF with 188 arcmin2 pixels compared to the cosmic shear power spectrum with an equivalent number of modes (ℓ < 886). The convergence PDF also partially breaks the degeneracy cosmic shear exhibits in that parameter space. A joint analysis of the convergence PDF and shear 2-point function also reduces the impact of shape measurement systematics, to which the PDF is less susceptible, and improves the total figure of merit by a factor of 2-3, depending on the level of systematics. Finally, we present a correction factor necessary for calculating the unbiased Fisher information from finite differences using a limited number of cosmological simulations.

KW - Cosmological parameters

KW - Cosmology: observations

KW - Gravitational lensing: weak

KW - Large-scale structure of Universe

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U2 - 10.1093/mnras/stx1626

DO - 10.1093/mnras/stx1626

M3 - Article

AN - SCOPUS:85042423589

SN - 0035-8711

VL - 472

SP - 439

EP - 446

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -