Cosmic shear nulling as a geometrical cosmological probe: Methodology and sensitivity to cosmological parameters and systematics

Understand

Tomographic weak lensing surveys contain intrinsic symmetries that depend solely on the geometric structure of the Universe.

• These symmetries can be revealed through null tests and verifying their validity provides constraints on cosmological parameters that govern the background evolution-particularly the redshift dependence of the angular diameter distance.
• This forms the foundation of the tomographic cosmic shear nulling test introduced in this work.
• We describe how this test can be implemented, what aspects of cosmology it can constrain, and its specific efficiency in doing so.