Nicholas Kern

Research Fellow | astrophysics & cosmology, radio astronomy, machine learning
Ann Arbor, MI, USA

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I am a NASA Hubble Fellow based at the University of Michigan. I am a data-focused researcher working at the interface of high-redshift astrophysics & cosmology, radio astronomical observation and machine learning. My research goals are to use next-generation radio telescopes to map the high-redshift universe with unprecedented statistical precision, enabling us to tap into a trove of currently unharnessed cosmological information. Some of the broad questions my research aims to address are:

  • How did the first stars, black holes, and galaxies form, and how did their radiative feedback impact the surrounding primordial hydrogen?
  • How do high-redshift observations of the universe fit with low-redshift observations, and how can they stress-test our cosmological model?
  • How can we robustly and optimally extract weak cosmological signals from noisy and systematics-contaminated data, and how can advances in machine learning accelerate this process?

I leverage data from powerful radio telescopes, and design novel, ML-driven analysis frameworks for addressing these questions. My current work is in developing the first fully end-to-end and differentiable Bayesian forward model for the wide range of 21 cm cosmology and line intensity mapping (LIM) experiments. This framework will be a critical step in suppressing systematics to the level needed to unlock 21 cm cosmology science, which enable us to probe cosmological structure across a wider redshift and scale range than currently accessible.

Previously, I was a Pappalardo Fellow at MIT. I received a PhD in astrophysics from UC Berkeley in 2020, and a BS in physics and astrophysics at the University of Michigan in 2015.


Upcoming Talks
Event Date Type
International Conference on Particle Physics & Cosmology
CMU, Pittsburgh, PA
October, 2025 research talk
NASA Hubble Symposium
Baltimore, MD
October, 2025 research talk
21cm Global Signal Conference
Caltech, Pasadena, CA
September, 2025 research talk
Astronomy Colloquium
U. Toledo, Toledo, OH
September, 2025 invited talk
HEP-Astro Seminar
U. Michigan, Ann Arbor, MI
September, 2025 invited talk
Astrophysics & Cosmology Seminar
U. Illinois, Urbana-Champaign, IL
September, 2025 invited talk

nkern@umich.edu
github.com/nkern
google scholar
linkedin/nicholas-kern