Schedule

MINDS SEMINAR

Deep Learning-based Search for 
Lensed Gravitational-Wave Signals from Binary Black Hole Events in GWTC-1 and -2

MINDS SEMINAR
period : 2022-07-11 ~ 2022-07-11
time : 13:00:00 ~ 14:00:00
개최 장소 : Math Bldg 404 & Online streaming (Zoom)
Topic : Deep Learning-based Search for 
Lensed Gravitational-Wave Signals from Binary Black Hole Events in GWTC-1 and -2
개요
Date 2022-07-11 ~ 2022-07-11 Time 13:00:00 ~ 14:00:00
Speaker Kyungmin Kim Affiliation Ewha Womans University
Place Math Bldg 404 & Online streaming (Zoom) Streaming link ID : 688 896 1076 / PW : 54321
Topic Deep Learning-based Search for 
Lensed Gravitational-Wave Signals from Binary Black Hole Events in GWTC-1 and -2
Contents We present the result of a deep learning-based search for beating patterns, one of the gravitational lensing signatures, from the observed gravitational-wave signals. In this search, we examine the binary black hole events in the first and second gravitational-wave transient catalogs. This search is the first endeavor utilizing deep learning for searching lensing signatures from gravitational waves. Specifically, the search identifies beating patterns induced by lenses with masses between 10^3--10^5M⊙ from spectrograms of gravitational-wave signals. We train a deep learning model with spectrograms of simulated noisy gravitational-wave signals to classify the binary black hole events into two classes, lensed or unlensed signals. We introduce an ensemble learning with the deep learning model and employ a majority voting strategy for the predictions of all ensemble learners. The majority voting-based primary classification classifies one event, GW190707_093326, out of forty-six events, into the lensed class. However, upon estimating the p-value of the event, we observe that the uncertainty of p-value still includes the possibility of the event being unlensed. Therefore, we conclude the gravitational-wave signal of GW190707_093326 is likely an unlensed signal and, consequently, our search finds no significant evidence of beating patterns from the evaluated binary black hole events.
MinDS MinDS · 2022-07-05 11:02 · Views 243