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27.03.2026 / 10:30 - 12:00 / Zeuthen, SR5 Villa
Astro-SeminarA decade of cosmological tensions from galaxy surveys, or: How I learned to love time domain astronomy
In the past decade, observations of large areas of the sky containing large numbers of distant galaxies have been developed into the most powerful way to answer some of the most pressing questions in fundamental physics, among them the nature of dark energy and neutrinos. As we enter the next decade of galaxy surveys, the Dark Energy Spectroscopic Experiment (DESI) is using a spectrograph with 5000 robotic fibers on the Mayall Telescope at Kitt Peak, Arizona, to lead the field of precision measurements of the expansion history of the cosmos. As I will discuss in my talk, early results from DESI may have widened and at the same time may have contributed to healing cracks in the standard model of cosmological physics. Whether the future is bright depends on whether we can quench a number of sources of systematic uncertainty, and on our ability to use the flood of galaxy survey data for less planned discoveries.
