| Name: | Ankur Barsode |
| Affiliation: | ICTS-TIFR |
| Conference ID: | ASI2025_331 |
| Title: | Detecting a population of strongly lensed gravitational waves |
| Authors: | Ankur Barsode 1, Parameswaran Ajith 1,2, Rajaram Nityananda 1 |
| Authors Affiliation: | 1 International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Bangalore 560089, India
2 Canadian Institute for Advanced Research, CIFAR Azrieli Global Scholar, MaRS Centre, West Tower, 661 University Ave., Suite 505, Toronto, ON M5G 1M1, Canada |
| Mode of Presentation: | Oral |
| Abstract Category: | Galaxies and Cosmology |
| Abstract: | A small fraction (~0.1 – 1%) of gravitational-wave (GW) signals detectable by ground-based detectors will be strongly lensed by intervening galaxies and clusters, producing multiple detectable copies of the same signal. These signals arrive at the detectors at different times due to characteristic time delays induced by lensing. These time delays differ from those between independent, unlensed GW signals, which might hint at a population of lensed signals in the data. We develop a Bayesian method to constrain the fraction of lensed signals in a population of GW events, based on the time delay between them. We discuss the prospects of detecting strong gravitational lensing through such a measurement by considering various observation scenarios, with potential applications to cosmography. |
