Matias Zaldarriaga
Welcome to my personal IAS page. I share research notes, data projects, and experimental tools; some are developed with my "Cronopios" (Codex and Claude), a name inspired by Julio Cortazar's Historias de cronopios y de famas.
DESI w0wa — Universal Distance Modes
A cosmology paper and fully reproducible code release analyzing the DESI BAO "dark energy" signal. Using an SVD of cosmological distance ratios, it shows that every low-redshift distance probe (DESI BAO, Pantheon+, DES Y5, Union3) measures the same leading mode — a near-perfect proxy for Ωmh² (R² > 0.99). The much-discussed w0wa tension lives almost entirely in that one matter-density direction, so it could originate in the CMB–BAO calibration rather than in new low-redshift physics.
The repository is also meant as an exercise in how to put out a scientific result. It was written end-to-end with my Cronopios (Claude Code), and every number in the paper traces back to the code that produced it: machine-readable claim and figure registries, a self-contained claim dashboard linking each figure to its computation, and precomputed data so anyone can regenerate the figures without rerunning the full pipeline.
SNS History Project
A public dataset and visualization project about the history of scholars and research at SNS.
Uros Explorer
An interactive 2D embedding of Uros Seljak's publications, colored by year and shaped by topic. Prepared for Uros Fest 2026.
