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Research Seminar: Searching gravitational wave signals with autoregressive approach and deep learning

Speaker:Prof. Chung Yue HUI
Affiliation:Department of Astronomy & Space Science, Chungnam National Univerisity (CNU, South Korea)
Date:February 1, 2023 (Wednesday)
Time:2:00 p.m.
Venue:MW325, 3/F, Meng Wah Complex, The University of Hong Kong


We are experimenting novel approaches of searching gravitational wave signal by employing autoregressive modeling and deep learning. The Autoregressive Integrated Moving Average (ARIMA) model holds the potential for an automatic pipeline for noise reduction, event candidate detections and template-free parameter estimation. In our proof-of-concept experiment with LIGO data, we demonstrated that our proposed scheme can extract the waveform with higher fidelity than the conventional spectral whitening. We have also proposed a deep learning algorithm by incorporating Generative Adversarial Network (GAN). By devising a GAN-based data augmentation scheme, we can tackle both small sample problem and imbalance class problem in classifying gravitational wave spectrograms with deep networks. By experimenting this framework in classifying glitches in the Gravity Spy dataset, we found that our method can yield a performance comparable to or even exceed that achieved by transfer-learning. Such technique can also increase the diversity of training data which can facilitate the search of gravitational wave signals with stochastic nature (e.g. from core-collapsed supernovae).


After completing his Bachelor (BSc) and MPhil degrees in physics from The University of Hong Kong, Hui has moved to Germany for his doctoral study under the support of Croucher Foundation and Max Planck Society. In 2007, after receiving his doctoral degree (Dr. Rer. Nat. magna cum laude) from University of Munich (LMU), he has continued his post-doctoral research in Max Planck Institute for Extraterrestrial Physics before joining CNU as a faculty member in 2010. 

Hui’s research interest covers high energy astrophysics, gravitational wave astronomy and astroinformatics. He is a consortium member of KAGRA and Cherenkov Telescope Array (CTA). He is also a co-founder of Fermi Asian Network (FAN) and the Center of High Energy Astrophysics (CHEA, Korea) for promoting collaborations in Asia.

Anyone interested is welcome to attend.