Description
Photometric Redshift Uncertainties Meet Intrinsic Alignments
The combined power of weak lensing, galaxy clustering, and galaxy-galaxy lensing (3x2pt) is a promising method to help us probe the underlying structure of our universe. This method helps us address key questions like the S8 tension and the nature of dark energy. Its statistical power relies on photometric redshifts, which allow us to build a vast and detailed evolutionary history of our universe. However, the uncertainty in the redshifts derived from this method and contamination from intrinsic alignments introduce significant systematic biases. The interacting effects of these systematics can degrade cosmological constraints and bias results, potentially causing us to misidentify the nature of our universe. I will be discussing the interplay of these systematics in a 3x2pt context and their effects on cosmology, as well as a look towards HOS and their response to these effects.
