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Pré-Publication, Document De Travail Année : 2016

Jackknife resampling technique on mocks: an alternative method for covariance matrix estimation

Résumé

We present a fast and robust alternative method to compute covariance matrix in case of cosmology studies. Our method is based on the jackknife resampling applied on simulation mock catalogues. Using a set of 600 BOSS DR11 mock catalogues as a reference, we find that the jackknife technique gives a similar galaxy clustering covariance matrix estimate by requiring a smaller number of mocks. A comparison of convergence rates show that $\sim$7 times fewer simulations are needed to get a similar accuracy on variance. We expect this technique to be applied in any analysis where the number of available N-body simulations is low.

Dates et versions

hal-02915320 , version 1 (14-08-2020)

Identifiants

Citer

Stéphanie Escoffier, M. -C. Cousinou, A. Tilquin, A. Pisani, A. Aguichine, et al.. Jackknife resampling technique on mocks: an alternative method for covariance matrix estimation. 2016. ⟨hal-02915320⟩
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