Carnegie Mellon University

Hy Trac

Associate Professor

Astrophysics & Cosmology
Wean Hall 8307

lab website

Prof. Hy Trac

Education & Professional Experience

PhD: University of Toronto (Canada), Astronomy & Astrophysics (2004)
B.Sc.: University of British Columbia (Canada), Physics and Astronomy (1999)



Curriculum ViTAE

Associate Professor, Carnegie Mellon University, 20016–
Assistant Professor, Carnegie Mellon University, 2010–16
Post-doctoral Research: Harvard University, 2007–10
Post-doctoral Research: Princeton University, 2004–07

Research Interests

I work on computational and theoretical cosmology and astrophysics. My research involves the development and application of numerical simulations to model and interpret the observable University. In cosmology, I work on complex problems involving the gas, stars, galaxies, quasars, and clusters of galaxies that provide information about the underlying dark matter and dark energy. In astrophysics, I am interested in the dynamics of stellar systems and the mergers of compact objects that produce gravitational waves. I also collaborate with computer scientists and statisticians to apply modern AI/ML approaches to improve multi-wavelength data analysis and numerical simulations. For example, we are applying Bayesian Deep Learning to map the dark matter in galaxy clusters. I am a member of the Atacama Cosmology Telescope (ACT) and Simons Observatory (SO) Collaborations.

Recent Publications

Anson D’Aloisio et al., Heating of the Intergalactic Medium by Hydrogen Reionization, Astrophys. J. 874, 154 (2019)

Hironao Miyatake et al., Weak-Lensing Mass Calibration of ACTPol Sunyaev-Zel'dovich Clusters with the Hyper Suprime-Cam Survey, Astrophys J. 875, 63 (2019)

The Simons Observatory Collaboration, The Simons Observatory: Science goals and forecasts, JCAP 02, 056 (2019)

M.M. Rau, S. Koposov, H. Trac, R. Mandelbaum, Calibrating long-period variables as standard candles with machine learning, MNRAS 484, 409 (2019)

A. Doussot, H. Trac, R. Cen, SCORCH. II. Radiation-hydrodynamic Simulations of Reionization with Varying Radiation Escape Fractions, Astrophys. J. 870, 18 (2018)

P. La Plante, H. Trac, R. Croft, R. Cen, Helium Reionization Simulations. III. The Helium Lyα Forest, Astrophys. J. 868, 106 (2018)

D. Glazer, M.M. Rau, H. Trac, The Reionization Parameter Space Consistent with the Thomson Optical Depth from Planck, Res. Notes AAS 2, 135 (2018)

Hy Trac, Parametrizing the Reionization History with the Redshift Midpoint, Duration, and Asymmetry, Astrophys. J. Lett. 858, L11 (2018)

Matt Hilton & the ACT Collaboration, The Atacama Cosmology Telescope: The Two-Season ACTPol Sunyaev-Zel'dovich Effect Selected Cluster Catalog, Astrophys. J. Supp. 235, 20 (2018)

Thibaut Louis & the ACT Collaboration, The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters, JCAP 06, 031 (2017)

P. La Plante, H. Trac, R. Croft, R. Cen, Helium Reionization Simulations. II. Signatures of Quasar Activity on the IGM, Astrophys. J. 841, 87 (2017)

Anson D'Aloisio et al., On the Contribution of Active Galactic Nuclei to the High-Redshift Metagalactic Ionizing Background, MNRAS 468, 4691 (2017)

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ORCID  Researcher ID