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QMAP Particles/Cosmology Andrew Liddle

Description Speaker: Andrew Liddle
Title: Interpreting DESI's evidence for evolving dark energy
Room: 3024
Host: John Terning
Abstract: We are all bored with LambdaCDM and seeking new cosmological physics to explore. For a decade the Hubble tension has been motivating vast numbers of new physics proposals, while this year the DESI collaboration claimed `tantalising hints’ of dark energy evolution from combined cosmic microwave background, baryon acoustic oscillation, and supernova data. We analyse both these lines of evidence from a Bayesian perspective. We argue that reduced tension alone cannot be used a robust signature of new physics, and that the best-fit evolving dark energy models create a new form of cosmic coincidence. In each case careful assessment of model and parameter priors is crucial, and models capable of fitting the data appear a priori unlikely.
Date Mon, May 13, 2024
Time 1:30pm-3:00pm PDT
Duration 1 hour 30 minutes
Access Public
Created by High-Energy Seminars
Updated Tue, May 14, 2024 4:41pm PDT
Send Reminder Yes  -  0 days 6 hour 0 minutes before start

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