Fisher Matrix Stability

Abstract

Fisher forecasts are a common tool in cosmology with applications ranging from survey planning to the development of new cosmological probes. While frequently adopted, they are subject to numerical instabilities that need to be carefully investigated to ensure accurate and reproducible results. This research note discusses these challenges using the example of a weak lensing data vector and proposes procedures that can help in their solution.

9 pages, 5 figures

References in corpus (5)

• LSST Science Book, Version 2.0
• Euclid Definition Study Report
• Report of the Dark Energy Task Force
• Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses
• Information Gain in Cosmology: From the Discovery of Expansion to Future Surveys

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• Joint Modelling of Astrophysical Systematics for Cosmology with LSST Cosmic Shear
• Parameter inference with non-linear galaxy clustering: accounting for theoretical uncertainties