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Fisher Matrix Stability
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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.
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Cited by 3 Pith papers
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Forecasting the Impact of Source Galaxy Photometric Redshift Uncertainties on the LSST $3\times2$pt Analysis
A Fisher forecast code for LSST 3x2pt and cosmic shear shows photo-z parameter marginalization inflates contours 2 to 6 times, and maps the most impactful photo-z parameters for each cosmological parameter.
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Probing massive neutrinos and modified gravity with redshift-space morphologies and anisotropies of large-scale structure
In a dark-matter-only simulation forecast, combining power spectrum multipoles with Minkowski functionals and tensors tightens constraints on neutrino mass and f(R) gravity parameters by factors of 1.5 to 3.4.
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Fisher Forecasting for the DESC with $\texttt{Augur}$
Augur is a validated DESC Fisher-forecasting pipeline whose Y1/Y10 3x2pt constraints match nested sampling and external forecast codes when derivative step sizes and redshift sampling are chosen in a stable regime.
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