26-30 July 2021
Europe/Berlin timezone

Implications for fi rst-order cosmological phase transitions and the formation of primordial black holes from the third LIGO-Virgo observing run

30 Jul 2021, 11:10


Parallel session talk Astroparticle and Gravitational Waves T01: Astroparticle and Gravitational Waves


Alba Romero-Rodríguez (IFAE)


We place constraints on the normalised energy density in gravitational waves from first-order strong phase transitions and then from the formation of primordial black holes using data from Advanced LIGO and Virgo's first, second and third observing runs. First, adopting a broken power law model, we place 95 % confidence level upper limits simultaneously on the gravitational-wave energy density at 25 Hz from unresolved compact binary mergers and strong first-order phase transitions. We then consider two more complex phenomenological models, limiting at 25 Hz the gravitational-wave background due to bubble collisions and the background due to sound waves at 95 % confidence level for phase transitions occurring at temperatures above 1e8 GeV. We then do a similar search assuming a background sourced by the formation of primordial black holes and unresolved compact binary mergers. For a very generic spectrum describing the primordial black hole background, we place 95% confidence level upper limits on the gravitational-wave energy density at 25 Hz

Collaboration / Activity Co-author
Email aromero@ifae.es
First author Alba Romero-Rodríguez

Primary authors

Alba Romero-Rodríguez (IFAE) Prof. Mairi Sakellariadou (King's College London) Mario Martinez (ICREA/IFAE-Barcelona) Mr Yue Zhao (Utah university) Mr Fengwei Yang (Utah university ) Mr Huaike Guo (Oklahoma university) Mr Thomas A. Callister (Flatiron Institute) Ms Katarina Martinovic (King's College London) Mr Ville Vaskonen (IFAE) Mr Oriol Pujolas (IFAE)

Presentation Materials