Seminario DeCAF: Alberto Domínguez

Date and time: 15:00h (CEST), Wednesday, October 14th, 2026

Location: Room M15-201, Facultad de Ciencias

Speaker: Prof. Alberto Domínguez, Universidad Complutense de Madrid

Title: Probing Cosmic History and the Hubble Constant via Gamma-Ray Attenuation

Abstract: The light emitted by all galaxies across cosmic time is encoded in the extragalactic background light (EBL), the diffuse background spanning ultraviolet to infrared wavelengths. Through electron positron pair production, the EBL acts as a source of opacity for very-high-energy gamma rays, leaving a distinct attenuation imprint on the spectra of distant sources. In this seminar, I will report on new EBL measurements derived from both the Fermi Large Area Telescope and ground-based Imaging Atmospheric Cherenkov Telescopes. These measurements allow us to constrain the cosmic star formation history and provide an independent measurement of the Hubble constant and cosmic matter density. These results demonstrate that high-energy astrophysics provides competitive cosmological constraints complementary to traditional astronomical surveys.

Join via Teams: https://teams.microsoft.com/meet/32964964378465?p=7LCc7AlTDSJtefNW0b

Passcode: n7Qn6Qr9

Additional information: https://weiguangcui.github.io/DECAF/