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Measuring Dark Energy with non-linear observables in the Euclid era

Santiago Casas
CEA, Sacley

We have long entered the era of precision cosmology, in which we have managed to extract with sub-percent accuracy the value of some cosmological parameters, using mostly linear physics like the CMB. However in the next years, with fourth-generation galaxy surveys, such as Euclid, LSST, SKA and WFIRST, we will also enter the era of big data and non-linearities, which will increase by order of magnitudes the information content that we will have to process and interpret. In this short talk I will explain our forecast methodology for the main probes of Euclid, namely Galaxy Clustering and Weak Lensing and how we handled the cross-correlation between these terms. Then I will focus on the challenges of dealing with non-linear power spectra, both for spectroscopic probes, in which non-linear redshift-space-distortion terms are important as well as for weak lensing in which baryonic feedback and N-body simulations are crucial. Finally, I will comment on our efforts to model these non-linear observables for general theories beyond LCDM, which is still an unsolved challenge.

2020 April 08, 16:00

Online broadcast (Zoom)

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia