[phas-undergrad] Seminar 10:30am, Tuesday, Aug. 6, 2024, Science Building 103

Bao-An Li Bao-An.Li at tamuc.edu
Sun Aug 4 14:55:50 CDT 2024


Physics and Astronomy Seminar
10:30am, Tuesday, Aug. 6, 2024, Science Building 103

Magnetar QPOs and crustal torsional oscillations
Dr. Hajime Sotani
[Photo of Hajime Sotani]RIKEN (Japan National Research and Development Agency)
Abstract:
Neutron stars are one of the most suitable environments for probing physics under extreme states. For example, the quasi-periodic oscillations (QPOs) observed in a giant flare occurred in a strongly magnetized neutron star (magnetar), are carrying crucial information for extracting the neutron star properties. To theoretically explain the observed QPOs from magnetars, we systematically examine the crustal torsional oscillations, neglecting the magnetic effects. We find that the observed QPOs can be identified well with crustal oscillations together with the nuclear saturation parameters. Then, we can constrain the so-called slope parameter, L. In addition, we consider the high-frequency QPOs observed in GRB 200415A. By identifying the observed QPOs, we can inversely constrain the neutron star mass and radius for GRB 200415A by comparing them to the values of nuclear saturation parameters obtained from terrestrial experiments.

ChatGPT: Dr. Hajime Sotani is an astrophysicist in Japan, affiliated with RIKEN. His research focuses on various aspects of astrophysics, including neutron stars, black holes, and gravitational waves. Dr. Sotani has published numerous papers contributing to the understanding of the fundamental properties and behaviors of these celestial objects. His work often involves collaborations with other leading scientists in the field. Detailed information about his research can be found at https://inspirehep.net/authors/988012?ui-citation-summary=true&ui-exclude-self-citations=true

BIO
2004.3. Ph.D @ Waseda University (supervisor: Kei-ichi Maeda)
2004.4.-2006.3. Assistant prof. @ Waseda Univ.
2006.4.-2008.3. Marie-Currie Fellow @ University of Thessaloniki (Kostas Kokktas)
2008.4.-2010.5. Postdoc fellow @ University of Tuebingen (Kostas Kokkotas)
2010.6.-2012.10. Postdoc fellow @ National Astronomical Observatory of Japan (NAOJ)
2012.11.-2014.6. Specially Appointed Assistant Professor @ Yukawa Institute, Kyoto Univ.
2014.7.-2019.6. Specially Appointed Assistant Professor @ NAOJ
2019.7.-2019.10. Specially Appointed researcher @ NAOJ
2019.11.-2024.9. Researcher @ RIKEN
2024.10.- Associate professor @ Kochi Univ.

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