Welcome talks and presentation of the meeting

• Francis Bernardeau (IPhT Saclay)

Room: salle des séminaires

The Flagship Simulation efforts and roadmap

• Pablo Fosalba
• Micol Bolzonella

Room: salle des séminaires - Presentation of the Flagship Wide by P. Fosalba - Presentation of the Flagship Deep by M. Bolzonella

Using cross correlation between 2D and 3D data in Euclid

• ALAIN BLANCHARD (IRAP , OMP)

Room: salle des séminaires Euclid will have the unique feature of simultaneously having 2D probes with 3*2pt but also 3D data on the same areas of the sky. In this presentation I will discuss how to use this information in a cost-effective way and the type of gain that can be forecasted.

A novel method to combine clustering and lensing analyses for spectroscopic and photometric samples

• Stefano Camera (U. Turin)

Room: salle des séminaires I present a new technique for the measurement of the growth of cosmic structures via the power spectrum of weak lensing cosmic shear, which can be straightforwardly combined to classic bias and growth measurements from clustering. It is based on a template-fitting approach, where a redshift-dependent amplitude of lensing modulates a fixed template power spectrum. To allow for tracking the redshift evolution of the signal, the method makes use of the Bernardeay-Nishimishi-Taruya transform, which allows for a localisation of the lensing kernel. I show that this method is able to correctly reconstruct Ωσ8 at the percent level across redshift, thus allowing us to measure the growth of structures unbiased by observing discrete tracers. Moreover, I only make use of mea- surements on linear scales. I also demonstrate that the method is robust against an incorrect choice of cosmological parameters in the template, thanks to the inclusion of an Alcock-Paczyński parameter.

OU-PHZ status and Roadmap

• William Hartley

Room: salle des séminaires

OU-SHE presentation and performances

• Andy Taylor

Room: salle des séminaires