Tuning the cosmic instrument: robust cosmology through combined probes

Speaker: Alex Reeves ( ETH Zurich) In Person and zoom 

Zoom info: https://stanford.zoom.us/j/98604058568

As wide-field surveys yield increasingly precise data, multiprobe analyses offer significant advantages. In this talk, I will discuss our study in which we use a previously developed framework to analyze combinations of three CMB (Planck PR3, Planck PR4, and ACT+WMAP) datasets, DESI Y1 Baryon Acoustic Oscillation (BAO) data, and a 9 × 2pt low-z dataset comprising KiDS-1000, BOSS DR12, and Planck CMB lensing/Integrated Sachs Wolfe (including all cross-correlations). I will discuss the internal consistency of and the hints of possible systematic effects in these data. Then I will show our associated constraints in ΛCDM and, motivated by recent DESI results, dynamical dark energy (w0waCDM) and free neutrino mass extensions. Finally, I will discuss the implications of these results in the context of recent cosmological hints of a dynamical dark energy scenario and (unphysical) negative neutrino masses. Based on https://arxiv.org/abs/2502.01722.