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 am a theoretical and computational cosmologist whose scientific interests include cosmic evolution and structure formation. My work is generally centered on the development and application of numerical simulations to model and interpret the observable Universe. In cosmology, I am especially interested in 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 would particularly like to work on star and planet formation and the development of planetary atmospheres. I also collaborate with machine learning experts and statisticians to apply modern approaches to improve multi-wavelength data analysis and numerical simulations. I am a member of the Atacama Cosmology Telescope (ACT), Sloan Digital Sky Survey (SDSS), and Large Synoptic Survey Telescope (LSST) 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