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Takeda, M.; Hiranuma, Y.; Kanda, N.; Kotake, K.; Kuroda, T.; Negishi, R.; Oohara, K.; Sakai, K.; Sakai, Y.; Sawada, T.; Takahashi, H.; Tsuchida, S.; Watanabe, Y.; Yokozawa, T.
Physical review. D, 10/2021, Letnik: 104, Številka: 8Journal Article
Through numerical simulations, it is predicted that the gravitational waves (GWs) reflect the characteristics of the core-collapse supernova (CCSN) explosion mechanism. There are multiple GW excitation processes that occur inside a star before its explosion, and it is suggested that the GWs originating from the CCSN have a mode for each excitation process in terms of time-frequency representation. Therefore, we propose an application of the Hilbert-Huang transform (HHT), which is a high-resolution time-frequency analysis method, to analyze these GW modes for theoretically probing and increasing our understanding of the explosion mechanism. The HHT defines frequency as a function of time, and is not bound by the trade-off between time and frequency resolutions. In this study, we analyze a gravitational waveform obtained from a three-dimensional general-relativistic CCSN model that showed a vigorous activity of the standing-accretion-shock-instability (SASI). We succeed in extracting the SASI induced GWs with high resolution on a time-frequency representation using the HHT and we examine their instantaneous frequencies.
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