Séminaire Doctoral / Seminar PhD |
| « Information content of high order correlation functions for weak lensing » |
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Matteo Rizzato |
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In order to fully exploit the constraining power of data that fu-
ture surveys like Euclid will provide, we need to understand how the cosmological information content of the observables of interest is diminished by the quality of our approximations. In particular, the fidelity of the modelling of the statistical properties of the ob- servables is paramount. Semi-analytical models for the non linear clustering have been developed in order to avoid heavy simula- tions (required for full-sky surveys). However, they might not be as precise as required at all the scales of interest. Along with the survey’s specificities, we need to understand how all these aspects can affect our capability in estimating the value of the cosmolog- ical parameters. I will present a pipeline capable to describe the dependence of the Fisher information content on the cosmological parameters in the case of weak lensing. The late time dark matter field being non-gaussian, I will show how it is possible to increase the retrieved information by considering the higher order correla- tion functions of the field. |
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vendredi 9 mars 2018 - 16:00 Salle du Conseil, Institut d'Astrophysique |
| Page web du séminaire / Seminar's webpage |