期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 505, 期 2, 页码 2886-2902出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1381
关键词
methods: analytical; methods: numerical; cosmology: theory; large-scale structure of Universe
资金
- French Agence Nationale de la Recherche [ANR-18CE31-0009]
- CNES
- ASI [I/023/12/0, 2018-23-HH.0]
- PRIN
- PRINMIUR
- PRIN-MIUR [2017YJYZAH]
The study focuses on accurately determining the total neutrino mass and the dark energy equation of state parameters through weak lensing probes. It calculates the convergence PDF using large-deviation statistics and validates the model against simulated data, demonstrating its precision and reliability, showing the advantages of the approach over other methods.
Pinning down the total neutrino mass and the dark energy equation of state is a key aim for upcoming galaxy surveys. Weak lensing is a unique probe of the total matter distribution whose non-Gaussian statistics can be quantified by the one-point probability distribution function (PDF) of the lensing convergence. We calculate the convergence PDF on mildly nonlinear scales from first principles using large-deviation statistics, accounting for dark energy and the total neutrino mass. For the first time, we comprehensively validate the cosmology dependence of the convergence PDF model against large suites of simulated lensing maps, demonstrating its per cent level precision and accuracy. We show that fast simulation codes can provide highly accurate covariance matrices, which can be combined with the theoretical PDF model to perform forecasts and eliminate the need for relying on expensive N-body simulations. Our theoretical model allows us to perform the first forecast for the convergence PDF that varies the full set of Lambda CDM parameters. Our Fisher forecasts establish that the constraining power of the convergence PDF compares favourably to the two-point correlation function for a Euclid-like survey area at a single source redshift. When combined with a cosmic microwave background prior from Planck, the PDF constrains both the neutrino mass M-nu and the dark energy equation of state w(0) more strongly than the two-point correlation function.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据