ChangHoon Hahn

I'm a postdoc at the Princeton Dept of Astrophysical Sciences . I'm interested in answering fundamental questions in cosmology and galaxy evolution using the millions of galaxies observed by large spectroscopic surveys: What is the nature of dark energy that drives the accelerated expansion of the Universe? What is the sum of neutrino masses? How do the environments of galaxies impact their evolution?

My research is highly multi-disciplinary. I develop new statistical and machine learning methods, especially for simulation-based inference (a.k.a. likelihood-free inference). I am an expert in large-scale structure cosmology and galaxy evolution. I am also heavily involved in two 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 for the past three years and I am currently a co-leader of the PFS Cosmology Survey.

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.