Research

I work on precision cosmology with large-scale structure data, focusing especially on measurements that connect cosmic distances, structure growth, and survey systematics. Much of my recent work has been within the Dark Energy Spectroscopic Instrument (DESI) collaboration, where I contribute to BAO measurements and validation for galaxy and quasar clustering. At UMichigan, I am part of the Huterer Research Group in the Department of Physics.

• Baryon acoustic oscillations

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  I study BAO as a precision standard ruler, with emphasis on validating measurements from galaxy and quasar clustering, reconstruction choices, mock catalogs, and blinding strategies.

• Growth and geometry

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  I develop and apply consistency tests that compare the cosmic expansion history with the growth of structure, probing dark energy, gravity, and possible departures from the standard cosmological model.

• Survey validation

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  I work on analysis validation for large spectroscopic surveys, including systematic tests, catalog-level checks, and coordination across analysis pipelines and working groups.

• Cosmological inference

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  I connect clustering measurements to cosmological constraints, including dark energy, gravity, neutrino physics, and consistency with complementary probes.

Current Interests

• DESI BAO measurements from galaxy and quasar clustering.
• Model-agnostic tests of the relationship between expansion and structure growth.
• Validation of analysis choices, blinding schemes, and covariance estimates.
• Connections between DESI, DES, Euclid, Rubin, and other large-scale structure probes.

Selected Research Contributions

BAO and galaxy clustering

• Validation of the DESI DR2 Measurements of Baryon Acoustic Oscillations from Galaxies and Quasars
  Led analysis and writing for the DESI DR2 galaxy and quasar BAO validation paper.
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
  Contributed as DR2 BAO Topical Group lead, including coordination, validation, unblinding tests, documentation, plots, and writing.

Growth, geometry, and gravity

• A test of the standard cosmological model with geometry and growth
  Developed a consistency test comparing cosmic expansion and the growth of structure.
• Exploring modified gravity: constraints on the μ and Σ parametrization with WMAP, ACT, and SPT
  Led an analysis constraining phenomenological departures from General Relativity.

Survey validation and systematics

• Validating the galaxy and quasar catalog-level blinding scheme for the DESI 2024 analysis
  Led validation of DESI catalog-level blinding methodology for galaxy and quasar clustering.
• Fiducial-cosmology-dependent systematics for the DESI 2024 BAO analysis
  Part of the DESI BAO validation and systematics program supporting robust distance-scale measurements.

Cosmic isotropy and homogeneity

• The angular scale of homogeneity with SDSS-IV DR16 luminous red galaxies
  Led a measurement of the cosmic homogeneity scale with luminous red galaxies.
• A model-independent test of cosmic isotropy with low-z Pantheon supernovae
  Led a low-redshift supernova analysis testing one of the foundational assumptions of standard cosmology.

Explore More

• Publications for refereed papers and collaboration results.
• Talks for selected invited and conference presentations.
• CV for a fuller record of leadership, service, mentoring, and professional history.