In separate conversations, I spoke with Yike Tang and MJ Vakili (both NYU graduate students) about doing hierarchical inference to infer the weak-lensing cosmological shear map at higher resolution than is possible by any shape-averaging method. Tang is working on building priors over shapes, and Vakili is looking at whether we could build more general priors over galaxy images. That, as my loyal reader knows, is one of my long-term goals; it could have many applications beyond lensing. At lunch, Glennys Farrar (NYU) gave a provocative talk about the possible effect of pion–matter effects (like an index of refraction) to resolve issues in understanding ultra-high energy cosmic ray showers in the atmosphere, issues that have been pointing to possible new physics.
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