Overview
Use observational tools to measure the expansion history of the universe. Trying to answer big questions like 'what is dark energy?'.
Current Appointments & Affiliations
Associate Professor of Physics
·
2023 - Present
Physics,
Trinity College of Arts & Sciences
Associate Professor in the Department of Electrical and Computer Engineering
·
2025 - Present
Electrical and Computer Engineering,
Pratt School of Engineering
Recent Publications
The Dark Energy Bedrock All-sky Supernova Program: Cross Calibration, Simulations, and Cosmology Forecasts
Journal Article The Astrophysical Journal · January 1, 2026 Abstract Type Ia supernovae (SNe Ia) have been essential for probing the nature of dark energy; however, most SN analyses rely on the same low-redshift sample, which may lead to shared ... Full text CiteIsotropy of Hubble Expansion in the Early and Late Universe
Journal Article Physical Review Letters · December 31, 2025 We test the isotropy of Hubble expansion by combining several probes for the first time, constructing full-sky maps of expansion rate variation using Type Ia supernovae, fundamental plane galaxies, and cosmic microwave background (CMB) temperature fluctuat ... Full text CiteReassessing the ZTF Volume-limited Type Ia Supernova Sample and Its Implications for Continuous, Dust-dependent Models of Intrinsic Scatter
Journal Article The Astrophysical Journal · December 10, 2025 Abstract The volume-limited low-redshift SNe Ia sample made available by ZTF DR2 is excellent for studying a central question for analyses of SNe Ia—whether the remaining diversity of ... Full text CiteRecent Grants
A Roman Project Infrastructure Team to Support Cosmological Measurements with Type Ia Supernovae
ResearchPrincipal Investigator · Awarded by National Aeronautics and Space Administration · 2023 - 2028Research in High Energy Physics at Duke University
ResearchCo Investigator · Awarded by Department of Energy · 2013 - 2028Big Data and the Biggest Tension in Cosmology
ResearchPrincipal Investigator · Awarded by David & Lucile Packard Foundation · 2019 - 2027View All Grants
Education, Training & Certifications
Johns Hopkins University ·
2013
Ph.D.
Massachusetts Institute of Technology ·
2007
B.S.