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Cosmology with weak lensing: shapes, sizes and baryons

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Cosmic shear is a relatively new discipline, but offers great potential for measuring Dark Energy properties and for testing Einstein’s theory of gravity. It is one of the main scientific methods proposed for ESA ’s Euclid imaging survey. In this talk I argue that another effect of gravitational lensing, cosmic size magnfication, which has received relatively little attention, is a promising extra source of signal. It refers to the changes in size of distant galaxies, and it can be used in a complementary fashion to shear, adding signal-to-noise, or provide an alternative analysis with different systematic effects, using the same basic data. In this talk, I present the ideas, challenges and potential, and also show new results from a full 3D lensing analysis of the CFHT LenS survey, showing tension with Planck results and a possible resolution.

This talk is part of the Cosmology Lunch series.

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