ChangHoon Hahn

I'm a postdoc at the Princeton Dept of Astrophysical Sciences . My research focuses on applying cutting-edge machine learning (ML) methods to the millions of galaxies observed by spectroscopic surveys to answer fundamental questions in cosmology and galaxy evolution: What is the nature of dark energy that drives the accelerated expansion of the Universe? What is the sum of neutrino masses? How does the underlying dark matter environment of galaxies impact their evolution?

My research is highly multi-disciplinary. I develop new statistical and ML methods (PROVABGS, SEDflow, Causalflow). I am also an expert in large-scale structure cosmology and galaxy evolution. My work leverages my expertise in both observations and theory/computation. I am leading ongoing and upcoming galaxy surveys: the Dark Energy Spectroscopic Instrument (DESI) and the Subaru Prime Focus Spectrograph (PFS). I served as a co-chair of the DESI Bright Galaxy Survey Working Group and I am currently a co-leader of the PFS Cosmology Survey. At the same time, I lead the SimBIG Collaboration and I am a member of the Quijote, CAMELS, and IQ collaborations.

Before Princeton, I was a postdoc fellow at the Lawrence Berkeley National Lab and UC Berkeley Center for Cosmological Physics. I completed my PhD in Physics at NYU Center for Cosmology and Particle Physics.