Only conversation today, making me worry about my ability to still actually do anything! Gabe Perez-Giz (NYU) and I spent an inordinate amount of time talking about how GPS works, and whether recent claims about systematic error in the OPERA neutrinos could be correct. We also talked about his work on classifying very odd test-particle orbits in the Kerr spacetime.
In the afternoon, Goodman, Hou, Foreman-Mackey, and I talked about Gaussian Processes, among other things. Hou's model of stellar variability is a very restricted (and physically motivated) GP, while Foreman-Mackey's Stripe 82 calibration model involves a (not physically motivated) GP for interpolation and error propagation. Goodman pointed us to the idea of the copula, which apparently destroyed the world recently.
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