What do acoustic scale observations tell us about dark energy?

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• Antony Lewis (University of Sussex)
• Monday 20 October 2025, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Louis Legrand.

I explore how cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) measurements constrain cosmological models. The CMB angular scale provides robust constraints on the ratio of sound horizon to angular diameter distance, limiting possible deviations from the standard ΛCDM model. The null energy condition for a separate dark energy component imposes strict inequalities on BAO observables relative to ΛCDM predictions, restricting the freedom to fit new data within standard cosmological frameworks. I’ll discuss what this means for latest BAO results and other possible interpretations.

This talk is part of the Cosmology Lunch series.

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