I had some work conversations today. One was with Kate Storey-Fisher (NYU) about our paper on a continuous-function estimator for the two-point correlation function of galaxies. We were discussing this related paper and how we might give a better or more intuitive mathematical derivation of our estimator. It is correct, but our argument is somewhat obtuse: It is that the estimator becomes Landy–Szalay for the top-hat-bin case, but is affine invariant. That is an odd argument!
I also had a long chat with Lehman Garrison (Flatiron) about N-body simulations, initial conditions, entropy, symmetries, reconstruction, halo occupation, and other matters related to the computational theory of cosmology. I'm hoping there's a project for us to do here.
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