GENERAL COLLOQUIUM

Speaker:  Tommaso Treu (UCLA)

Data:   Tuesday June 17, 4:00 PM -6:00 PM
Luogo: Aula Conversi (Ed. Marconi)

The talk presents new cosmological results based on JWST observations of strongly lensed quasars. The first part focuses on using gravitational time delays (via the TDCOSMO collaboration) to measure the Hubble constant independently of both the local distance ladder and the cosmic microwave background, offering insights into the current tension in H₀ measurements. The second part uses JWST-MIRI data to detect dark subhalos lacking stars, providing a test of the cold dark matter model and constraining key dark matter properties like free streaming length and self-interaction cross section.

Zoom: https://uniroma1.zoom.us/j/82330282429?pwd=MktKdmlkSUxxdXlraFhKSHhJTDZnUT09