Seminar:- Detectability of Lensed Gravitational Waves in Matched-Filtering Searches
Gravitational lensing by compact, small-scale intervening masses causes frequency-dependent distortions to gravitational-wave events. The optimal Signal-to-Noise Ratio(SNR) is often used as a proxy for the detectability of exotic signals in gravitational-wave searches. In reality, the detectability of such signals in a matched-filtering search requires comprehensive consideration of match-filtered SNR, signal-consistency test value, and other factors. In this work, the speaker investigates for the first time the detectability of lensed gravitational waves from compact binary coalescences with a match-filtering search pipeline. Contrary to expectations from the optimal-SNR approximation approach, he shows that the strength of a signal (i.e., higher optimal SNR) does not necessarily result in higher detectability. He also demonstrates that lensed gravitational waves with wave optics effects can suffer significantly, from ~90% (unlensed) to <1% (lensed) detection efficiency, due to downranking by the signal-consistency test values. These findings stress the need to extend current template banks to effectively search for lensed gravitational waves and to reassess current constraints on compact dark matter scenarios.
時間：2025.01.07(二) 13:30~14:30
地點：香港中文大學 科學館*北座 G25室
講者：Juno CHAN Chun-Lung 陳俊龍 (Niels Bohr Institute University of Copenhagen, Denmark)
語言：英語
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【此屬轉載信息，以主事單位發布為準】
*Science Centre
此活動由香港中文大學物理系主辦。
https://wp.phy.cuhk.edu.hk/wp-content/uploads/25-01-07sem-Chan-CLJ.pdf
