Matias Zaldarriaga

Matias Zaldarriaga Matias Zaldarriaga is an Argentine-born theoretical astrophysicist and cosmologist known for foundational work on the cosmic microwave background and large-scale structure, with influential contributions to statistical methods for primordial non-Gaussianity and cosmological perturbation theory. He has collaborated with researchers across institutions and missions, contributing to analyses relevant to the WMAP, Planck, and upcoming experiments connected to BICEP and Simons Observatory. His work bridges theoretical frameworks from inflationary theory to observational programs such as SDSS, DES, and Vera C. Rubin Observatory.

Early life and education

Born in Buenos Aires, Zaldarriaga completed undergraduate studies at the Universidad de Buenos Aires and pursued graduate training at Princeton University under the supervision of David N. Spergel. During his doctorate he interacted with research groups associated with NASA, NSF, and projects led by investigators at Institute for Advanced Study, Harvard University, Massachusetts Institute of Technology, and Yale University. His formative years included collaborations and visits to institutions such as California Institute of Technology, Stanford University, University of Chicago, and Columbia University, exposing him to teams working on COBE, WMAP, and theoretical developments by figures like Alan Guth, Andrei Linde, Paul Steinhardt, and Viatcheslav Mukhanov.

Research and contributions

Zaldarriaga developed analytical and numerical techniques for the analysis of anisotropies in the Cosmic microwave background. He co-authored methods for fast computation of cosmological angular power spectra that have been used by groups at Max Planck Institute for Astrophysics, Space Telescope Science Institute, European Space Agency, and collaborations involving Johns Hopkins University, Carnegie Institution for Science, and University of California, Berkeley. His papers on secondary anisotropies, lensing of the CMB, and reionization informed measurements made by teams at Atacama Cosmology Telescope, South Pole Telescope, BICEP2, and POLARBEAR. Zaldarriaga's work on primordial non-Gaussianity and bispectrum estimation influenced analyses by researchers at University of Cambridge, Princeton University Observatory, Institute for Theoretical Physics (UCSB), and groups led by Matias Zaldarriaga (do not link). He introduced tools that interface with data pipelines used by Planck Collaboration, ACTPol, SPTpol, Herschel Space Observatory, and surveys like 2dF Galaxy Redshift Survey and 6dF Galaxy Survey. His theoretical contributions connect to concepts developed by Scott Dodelson, Wayne Hu, Marc Kamionkowski, Neil Turok, and Martin Rees, while his methodological advances are implemented alongside software from HEALPix, CAMB, CLASS, and numerical techniques used at National Center for Supercomputing Applications and Lawrence Berkeley National Laboratory.

Academic positions and affiliations

Zaldarriaga has held faculty and research positions at Harvard University, where he engaged with departments linked to CfA and collaborations with MIT Kavli Institute for Astrophysics and Space Research, and later at Institute for Advanced Study and New York University. He has maintained affiliations with observational consortia including the Planck Collaboration and academic networks spanning Perimeter Institute for Theoretical Physics, Kavli Institute for Cosmological Physics, Simons Foundation, and the Flatiron Institute. His collaborations extend to researchers at University of Pennsylvania, University of Toronto, University of Oxford, University of Cambridge, Imperial College London, ETH Zurich, Max Planck Institute for Radio Astronomy, and laboratories such as SLAC National Accelerator Laboratory and Fermi National Accelerator Laboratory.

Awards and honors

Zaldarriaga's recognition includes the MacArthur Fellows Program fellowship and the Gruber Prize in Cosmology, with citations highlighting contributions to cosmic microwave background science and cosmological parameter estimation. He has received fellowships and grants from the National Science Foundation, the Simons Foundation, and honors from societies such as the American Physical Society, American Astronomical Society, and Royal Astronomical Society. His achievements were recognized in symposia at International Astronomical Union meetings, COSPAR sessions, and conferences organized by American Institute of Physics, European Astronomical Society, and institutes including Perimeter Institute and Kavli Foundation.

Selected publications and impact

Representative publications by Zaldarriaga include influential articles in journals like Physical Review Letters, Physical Review D, Astrophysical Journal, and Monthly Notices of the Royal Astronomical Society. These works address topics such as CMB polarization, lensing reconstruction, non-Gaussianity estimators, and cross-correlation techniques with large-scale structure surveys including SDSS, DES, and LSST. His papers are widely cited by researchers at Planck Collaboration, groups analyzing data from WMAP, ACT, SPT, and theory groups at Princeton University, Harvard University, Caltech, and UC Berkeley. The methodologies he developed are integrated into pipelines used by collaborations such as CMB-S4, Simons Observatory, Euclid, and Roman Space Telescope, influencing forecasts and design choices cited in instrument proposals from NASA, ESA, NSF, and international consortia.

Category:Argentine astrophysicists Category:Cosmologists Category:Princeton University alumni