Hi, I'm Julian. Welcome to my page!

I am a theoretical cosmologist, working as a long-term Clay fellow at the Harvard-Smithsonian Center for Astrophysics. Before that I was a postdoctoral fellow at the Harvard Physics Department. I got my PhD from Johns Hopkins University in 2017, under the supervision of Marc Kamionkowski.

My work is at the intersection of particle physics and astrophysics. Recently, I have focused on learning about cosmology, galaxy formation, and dark-matter microphysics from the first galaxies. This includes using UV LFs from Hubble as well as the 21-cm line of hydrogen. I have developed the latter both as a new dark-matter probe and as a standard ruler (using velocity-induced acoustic oscillations, or VAOs). My interests also include gravitational lensing, the large-scale structure, light relics, primordial black holes, fast radio bursts, and the cosmic microwave background.

You can find my full CV here, and my publications in



Feel free to contact me at

julianmunoz (AT) cfa.harvard.edu