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

Shouvik Roy Choudhury^1*

¹Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taipei, Taiwan

* Presenter:Shouvik Roy Choudhury, email:sroy@asiaa.sinica.edu.tw

Based on arXiv: 2409.13022 and arXiv: 2504.15340 (both published in ApJ Letters) 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.

Keywords: dark energy, cosmological neutrinos, Hubble tension