I spent the day at MPA and MPE in Garching, where I gave a seminar in the "Bayes Forum". I talked about hierarchical inference for quasar target selection, exoplanet characterization, and astronomical image processing (source detection). The audience asked all the right questions. After my talk, Torsten Ensslin showed me some nice results from his "information field theory" approach to inferring density fields and other maps from finite data. His approach is a well-defined, controlled approximation to Bayesian inference that makes use of the equipment of field theory.

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