Publication
New Virgo papers
September 2, 2020
Gravitational Waves GroupTwo new papers have been published by the group
“A gravitational-wave measurement of the Hubble constant following the second observing run of Advanced LIGO and Virgo” . Thanks to the relevant contributions by C. Karathanasis (PhD student from IFAE), he has been invited as author of this flagship paper from O2 submitted to Submitted to ApJ.
“Determination of the light exposure on the photodiodes of a new instrumented baffle for the Virgo input mode cleaner end-mirror” . Submitted to CQG Journal.
Gravitational Waves
Spain strengthens its participation in major gravitational-wave infrastructures
December 10, 2025
The Spanish Ministry of Science, Innovation and Universities has allocated new funding to Spain’s participation in major international gravitational-wave infrastructures, with the Institut de Física d’Altes Energies (IFAE) designated as the institution through which these contributions will be channelled.
Results
LIGO–Virgo–KAGRA complete their richest gravitational-wave observation run to date
November 18, 2025
The LIGO–Virgo–KAGRA (LVK) Collaboration has announced the completion of O4, the most productive gravitational-wave observation run so far, yielding an unprecedented number of candidate events and high-quality data for the scientific community.
Results
LIGO, Virgo and KAGRA observed 'second generation' black holes for the first time
October 29, 2025
Researchers from the Institut de Física d’Altes Energies (IFAE), through its Gravitational Waves group, participate in the LIGO–Virgo–KAGRA collaboration that has reported the first observational evidence of candidate second-generation black holes. The analysis of two gravitational-wave signals reveals binary systems with unusual mass ratios and spin configurations, opening a new window on black-hole formation in dense astrophysical environments.