An article from the LIGO-Virgo-KAGRA collaboration, explained by Mairi Sakellariadou, Professor of theoretical physics at King's College London, and member of the LIGO collaboration.
Constraints on Cosmic strings using data from the third Advanced LIGO-Virgo observing run ; R. Abbott et al. (LIGO Scientific Collaboration, Virgo Collaboration, and KAGRA Collaboration), Phys. Rev. Lett. 126, 241102 – Published 16 June 2021.