Cosmology in an extended parameter space: new constraints on dark energy and neutrino masses with DESI BAO

We update constraints on cosmological parameters in a
12-parameter model, which extends the standard 6-parameter ΛCDM to include
dynamical dark energy and massive neutrinos, along with other new
parameters. We use the latest Planck PR4 (2020) likelihoods, DESI DR1 &
DR2 BAO, and the latest uncalibrated type Ia Supernovae (SNe) datasets. In
this talk, I will discuss the implications for dynamical dark energy in
such an extended model, and at the same time, provide robust bounds on
neutrino masses which will be useful for the astro- and particle physics
communities. I will also discuss the current status of the weak lensing
tension and the Hubble tension in this extended cosmology.
[Based on arXiv: 2409.13022 and arXiv: 2504.15340 (both published in ApJ
Letters)]