Zack Slepian is currently a tenured associate professor in the astronomy department at the University of Florida, and previous to that held Einstein and Chamberlain fellowships at Lawrence Berkeley National Laboratory after a PhD at Harvard with Daniel Eisenstein. His major focus has been measuring and using higher-order clustering statistics of galaxies in redshift surveys such as BOSS, DESI and Roman, including the first detection of Baryon Acoustic Oscillations in the galaxy 3-point function, and intriguing evidence for parity violation in the galaxy 4-point function. His interests are broad and include mathematical physics, new physics during inflation (axions, parity violation), dark energy, algorithms, and philosophy of physics.
Title: 2, 3, 4 point functions: GPU, some math, some data.
Abstract: I will discuss new developments by my group in
- measurement of the galaxy 2, 3, 4 Point Correlation Function with Graphics Processing Units (GPUs)
- speeding up the model and covariance for these with clever math + GPUs
- a little math interlude: generalizing Legendre and Gegenbauer polynomials, multipole expansions, and connections to Bessel integrals and cosmological Perturbation Theory
- a little data: what can I show you or tell you about the DESI analysis?