A Quick Intro to Bayes and Emulating the Matter Power Spectrum

Jan 07, 2019 - 11:00 am to 12:00 pm

Campus, Varian 355

Earl Lawrence (Los Alamos National Laboratory)

I will start with a short introduction to Bayesian statistics, including the magic of Markov chain Monte Carlo. With these concepts, I will describe how to build and use an emulator, a fast statistical approximation to a computationally intensive simulation. I will present this in the context of the Cosmic Emu, an emulator for the matter power spectrum based on large n-body simulations. The work involves various types of Gaussian process models, a flexible approach to regression that's useful in lots of contexts, cosmological and otherwise.