2021/05/31 by Justin Janquart, O. A. Hannuksela, Otto A. Hannuksela +3
Physics and Astronomy · #Algorithm #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Computer science #Galaxy #Gamma-ray bursts and supernovae #Gravitational lens #Gravitational wave #Gravitational-wave observatory #LIGO #Physics #Pulsars and Gravitational Waves Research #Redshift #Sky #astro-ph.HE #gr-qc
paper · pdf · doi:10.1093/mnras/stab1991
10 pages, 6 figures
arxiv created 2021/07/09 · openalex publication_date 2021/07/12 · arxiv updated 2021/08/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
ABSTRACT Gravitational waves, like light, can be gravitationally lensed by massive astrophysical objects such as galaxies and galaxy clusters. Strong gravitational-wave lensing, forecasted at a reasonable rate in ground-based gravitational-wave detectors such as Advanced LIGO, Advanced Virgo, and KAGRA, produces multiple images separated in time by minutes to months. These images appear as repeated events in the detectors: gravitational-wave pairs, triplets, or quadruplets with identical frequency evolution originating from the same sky location. To search for these images, we need to, in principle, analyse all viable combinations of individual events present in the gravitational-wave catalogues. An increasingly pressing problem is that the number of candidate pairs that we need to analyse grows rapidly with the increasing number of single-event detections. At design sensitivity, one may have as many as \mathcal O(105) event pairs to consider. To meet the ever-increasing computational requirements, we develop a fast and precise Bayesian methodology to analyse strongly lensed event pairs, enabling future searches. The methodology works by replacing the prior used in the analysis of one strongly lensed gravitational-wave image by the posterior of another image; the computation is then further sped up by a pre-computed lookup table. We demonstrate how the methodology can be applied to any number of lensed images, enabling fast studies of strongly lensed quadruplets.