Research Activity

Tomohiro Harada April 5, 2021

Contents

1 Seminars 1

2 Intensive course 4

3 Discussion group 5

4 Workshops and lectures organisation 5

5 Researcher who belongs or belonged to our group 6

6 Visitors 7

1 Seminars

We have seminars every Tuesday in the field of cosmology, gravitation, astro- physics and particle physics. If you are interested in giving a talk in the field of cosmology, gravitation and astrophysics, please contact harada_AT_rikkyo.ac.jp. Recent seminar talks in the field of relativity, cosmology and astrophysics are listed below.

ˆ 2020: Hiramatsu, Takashi (Rikkyo U); Kamata, Kouhei (RESCEU, U Tokyo); Kinugawa, Tomoya (ICRR, U Tokyo); Omukai, Kazuyuki (To- hoku U); Fujikura, Kouhei (TIT); Ikeda, Taishi (Rome U); Kuroyanagi, Sachiko (Universidad Autonoma de Madrid); Saida, Hiromi (Daido Insti- tute of Technology); Soda, Jiro (Kobe U); Kiuchi, Kenta (Max Planck Institute); Yoshida, Daisuke (Kobe U); Honma, Mareki (NAOJ)

ˆ 2019: Mizuno, Yosuke (Goethe University, Frankfurt), Kimura, Masashi (Rikkyo U); Noda, Sohsuke (YITP); Asano, Katsuaki (ICRR, U. Tokyo); Takahashi, Ryuichi (Hirosaki U); Kyutoku, Koutaro (Kyoto U); Shimada, Keigo (TIT); Arai, Shun (Nagoya U); Inomata, Keisuke (ICRR, U. Tokyo); Naruko, Atsushi (YITP); Suwa, Yudai (Kyoto Sangyo U); Ohsuga, Ken (Tsukuba U); Saito, Ryo (Yamaguchi U)

1 ˆ 2018: Takahashi, Kazufumi (Rikkyo U); Ikeda, Taishi (Nagoya U); Seto, Naoki (Kyoto U); Mena, Filipe C. (Univ. Minho, Braga); Taruya, Atsushi (YITP); Nambu, Yasusada (Nagoya U); Nishizawa, Atsushi (Nagoya U); Kimura, Masashi (IST, Lisbon); Tada, Yuichiro (Nagoya U); Senovilla, Jos´eM. M. (U Basque Country UPV/EHU); Carr, Bernard (QMUL); Soda, Jiro (Kobe U); Houri, Tsuyoshi (Maizuru NCT); Motohashi, Hayato (Kyoto U) ˆ 2017: Kinoshita, Shunichiro (Chuo U); Izumi, Keisuke (Nagoya U); Ohta, Atsuhisa (TIT); Fujita, Tomohiro (Kyoto U); Hotta, Masahiro (Tohoku U); Thaller, Maximilian (Chalmers University of Technology, Gothen- burg/Rikkyo U); Tanahashi, Norihiro (Osaka U); Negishi, Hiroyuki (Os- aka City U); Asada, Hideki (Hirosaki U); Sakakibara, Yuki (Osaka City U); Tokuda, Junsei (Kyoto U); Ishibashi, Akihiro (Kindai U); Akitsu, Kazuyuki (Kavli IPMU); Inoue, Yoshiyuki (RIKEN); Oshita, Naritaka (RESCEU, U Tokyo); Debnath, Ujjal (IIEST, Shibpur) ˆ 2016: Obata, Ippei (Kyoto U); Yamada, Kei (YITP); Lee, Chung-Chi (NCTS, Hsinchu); Wu, Yi-Peng (Academia Sinica, Taipei); Kohri, Kazunori (KEK); Kinugawa, Tomoya (U Tokyo); Negoro, Hitoshi (Nihon U); Tag- ishi, Hideyuki (Osaka City U); Kimura, Ranpei (TIT); Giri, Anjan (IIT Hyderabad); Suto, Yasushi (U Tokyo); Takamizu, Yuichi (Rikkyo U); Cro- ker, Kevin (U Hawaii); Rocha, Jorge (U Barcelona); Yumisaki, Akira (Gunma U); Yamauchi, Daisuke (Kanagawa U); Nakano, Hiroyuki (YITP); Tashiro, Hiroyuki (Nagoya U) ˆ 2015: Tanabe, Kentaro (KEK); Itoh, Yousuke (RESCEU, U Tokyo); Ida, Daisuke (Gakushuin U); Kyutoku, Koutarou (KEK); Yoo, Chulmoon (Nagoya U); Vega, Ian (SISSA, Trieste) ; Masusa, Atsuki (Osaka City U); Shi- romizu, Tetsuya (Nagoya U); Noda, Sosuke (Nagoya U); Tsukamoto Naoki (Rikkyo U); Aoki Katsuki (Waseda U); Nakayama, Kazunori (Tokyo U); Namba, Ryo (Kavli IPMU) ˆ 2014: Okuzumi, Satoshi (TIT); Saga, Shohei (Nagoya U); Tomizawa, Shin- ya (Tokyo University of Technology); Jhingan, Sanjay (Jamia Millia Is- lamia, Delhi); Nair, Remya (Jamia Millia Islamia, Delhi); Torii, Takashi (Osaka Institute of Technology); Okawa, Hirotada (Waseda U); Naruko, Atsushi (TIT); Hoshino, Masahiro (U Tokyo); Kuroyanagi, Sachiko (Nagoya U); Inutsuka, Shuichiro (Tokyo U of Science); Urakawa, Yuko (Nagoya U); Sakai, Nobuyuki (Yamaguchi U); Toma, Kenji (Tohoku U); Sekiguchi, Toyokazu (Helsinki U) ˆ 2013: Hayasaki, Kimitake (Korea Astronomy and Space Science Insti- tute, Daejeon, South Korea); Ohsuga, Ken (NAOJ); Tanahashi, Norihiro (IMPU); Tsutsui, Ryo (RESCEU, U Tokyo); Kunstatter, Gabor (Win- nipeg U); Kimura, Masashi (YITP); Lin, Chia-Min (Chuo U); Konno, Kohkichi (Tomakomai NCT); Yamamoto, Kazuhiro (Hiroshima U); Bhat- tacharya, Sourav (Harish-Chandra Research Institute, Allahabad); Soumiya,

2 Kentaro (TIT); Nishizawa, Atsushi (Kyoto U); Ishibashi, Akihiro (Kinki U); Musco, Ilia (U Oslo); Oyama, Yoshihiko (KEK); Shibata, Masaru (YITP); Yamashita, Shinji (Kumamoto U); Rugina, Christina (U Bucharest); Murata, Keiju (Keio U) ˆ 2012: Takei, Dai (Harvard-Smithsonian Center for Astrophysics); Kuroy- anagi, Sachiko (RESCEU, U Tokyo); Sotani, Hajime (NAOJ); Shiraishi, Maresuke (Nagoya U); Sendouda, Yuuiti (Hirosaki U); Yokoyama, Shuichiro (U Tokyo); Itoh, Yousuke (RESEU, U Tokyo); Koiso, Miyuki (Kyushu U); Uchikata, Nami (Tohoku U); Watanabe, Yuki (RESCEU, U Tokyo); Makino, Junichiro (TIT); Kohri, Kazunori (KEK); Kinoshita, Shunichiro (Osaka City U); Kyutoku, Kotaro (KEK); Susa, Hajime (Konan U); Saikawa, Kenichi (ICRR, U Tokyo); Hotokezaka, Kenta (Kyoto U); Nakamura, Shin (Kyoto U) ˆ 2011:Yagi, Kent (Kyoto U); Tagoshi, Hideyuki (Osaka U); Wada, Tomo- hide (NAOJ); Kasai, Masumi (Hirosaki U); Matsubara, Takahiko (Nagoya U); Ioka, Kunihito (KEK); Kawai, Hikaru (Kyoto U); Asada, Hideki (Hi- rosaki U); Yoshida, Shijun (Tohoku U); Kotake, Kei (NAOJ); Iso, Satoshi (KEK); Mizuta, Akira (KEK); Kimura, Masashi (YITP); Takada, Masahiro (IPMU); Maeda, Hideki (CECs, Valdivia); Hayasaki, Kimitake (YITP); Yoshino Hirotaka (KEK); Yoo, Chul-Moon (YITP); Iguchi, Hideo (Nihon U); Chiba, Masashi (Tohoku U); Nagakura, Hiroki (YITP); Jhingan, San- jay (Jamia Millia Islamia, New Delhi); Iguchi, Satoru (NAOJ); Mineshige, Shin (Kyoto U); Kurita, Yasunari (Kanagawa Institute of Technology); Harada, Tomohiro (Rikkyo U) ˆ 2010: Kiuchi, Kenta (YITP); Yasutake, Nobutoshi (NAOJ); Yokoyama, Jun’ichi (RESCEU, U Tokyo); Ishibashi, Akihiko (KEK); Sago, Norichika (YITP); Abe, Fumio (Nagoya U); Itoh, Yousuke (Tohoku U); Novak, Jerome (Observatoire de Paris); Fujisawa, Kotaro (U Tokyo); Kimura, Masashi (Osaka City U); Tsuchiya, Shunji (Keio U); Maeda, Hideki (CECS, Valdivia); Takahashi, Rohta (RIKEN); Shibata, Shinpei (Yamagata U); Jhingan, Sanjay (Jamia Millia Islamia, New Delhi); Nozawa, Masato (Waseda U); Kawanaka, Norita (KEK); Taruya, Atsushi (RESCEU, U Tokyo); Tavakol, Reza (Queen Mary U of London); Izumi, Keisuke (IPMU) ˆ 2009: Yoshida, Shin-Ichiro (U Tokyo); Carr, Bernard J (Queen Mary U of London/RESCEU, U Tokyo); Soda, Jiro (Kyoto U); Siino, Masaru (TIT); Bamba, Aya (JAXA/ISAS); Ohsuga, Ken (NAOJ); Maeda, Hideki (CECS, Valdivia); Nakao, Ken-ichi (Osaka City U); Bambi, Cosimo (IPMU); Yamaguchi, Masahide (Aoyama Gakuin U); Kobayashi, Tsutomu (Waseda U); Barack, Leor (U Southampton); Saijo, Motoyuki (Rikkyo U); Chiba, Takeshi (Nihon U); Torii, Shoji (Waseda U) ˆ 2008: Uchiyama, Yasunobu (JAXA/ISAS); Mueller, Ewald (Max-Planck Institute (Garching)); Nolan, Brien C (Dublin City U); Ioka, Kunihito (KEK); Suyama, Teruaki (ICRR, U Tokyo); Baiotti, Luca (U Tokyo);

3 Tamaki, Takashi (Waseda U/Rikkyo U); Taruya, Atsushi (U Tokyo); Hori- uchi, Shunsaku (U Tokyo); Asano, Katsuaki (TIT); Sasaki, Misao (YITP); Hansen, Jakob (Waseda U); Miyamoto, Umpei (Hebrew U, Israel); Sug- awara, Yasuharu (Chuo U) ˆ 2007: Kawai, Nobuyuki (TIT); Shiromizu, Tetsuya (TIT); Ohashi, Takaya (Tokyo Metropolitan U); Seto, Naoki (NAOJ); Miyamoto, Umpei (Waseda U); Tsujikawa, Shinji (Gunma NCT); Tomisaka, Koji (NAOJ); Sotani, Hajime (Aristotle U of Thessaloniki); Hayward, Sean A. (Shanghai Normal U); Masai, Kuniaki (TMU); Tavakol, Reza (Queen Mary, U of London); Kiuchi, Kenta (Waseda U); Yamazaki, Dai G. (NAOJ); Mizuno, Shuntaro (RESCEU); Tomimatsu, Akira (Nagoya U); Tamaki, Takashi (Waseda U)

ˆ 2006: Hanayama, Hidekazu (NAOJ); Sekiguchi, Yuichiro (U Tokyo); Muko- hyama, Shinji (U Tokyo); Nagakura, Takanobu (NAOJ); Siino, Masaru (Tokyo Institute of Technology); Suzuki, Takeru (U Tokyo); Yamamoto, Akira (KEK); Sharif, M. (U Punjab); Saida, Hiromi (Daido Institute of Technology); Yamada, Shoichi (Waseda U); Takiwaki, Tomoya (U Tokyo); Narita, Makoto (National Taiwan U); Kobayashi, Chiaki (NAOJ); Enoki, Motohiro (NAOJ); Hirotani, Kouichi (TIARA, Taipei)

2 Intensive course

Our department is known with its intensive courses by distinguished invited lecturers. Recent intensive courses in our fields are following:

ˆ 2020: Omukai, Kazuyuki (Tohoku U); Soda, Jiro (Kobe U)

ˆ 2019: Kyutoku, Koutaro (Kyoto U); Ohsuga, Ken (Tsukuba U) ˆ 2018: Taruya, Atsushi (YITP); Nambu, Yasusada (Nagoya U) ˆ 2017: Asada, Hideki (Hirosaki U); Ishibashi, Akihiro (Kindai U)

ˆ 2016: Kohri, Kazunori (KEK); Suto, Yasushi (U Tokyo) ˆ 2015: Itoh, Yousuke (RESCEU, U Tokyo); Shiromizu, Testuya (Nagoya U) ˆ 2014: Hoshino, Masahiro (U Tokyo); Inutsuka, Shuichiro (Nagoya U)

ˆ 2013: Yamamoto, Kazuhiro (Hiroshima U); Shibata, Masaru (YITP) ˆ 2012: Makino, Junichiro (TIT); Susa, Hajime (Konan U) ˆ 2011: Mineshige, Shin (Kyoto U); Chiba, Masashi (Tohoku U); Matsub- ara, Takahiko (Nagoya U)

ˆ 2010: Shibata, Shinpei (Yamagata U); Kodama, Hideo (KEK)

4 ˆ 2009: Soda, Jiro (Kyoto U); Nakao, Ken-ichi (Osaka City U); Terasawa, Toshio (TIT) ˆ 2008: Sasaki, Misao (YITP); Ioka, Kunihito (KEK) ˆ 2007: Tomimatsu, Akira (Nagoya U.); Masai, Kuniaki (TMU); Tomisaka, Koji (NAOJ) ˆ 2006: Yamada, Shoichi (Waseda U); Wada, Keiichi (NAOJ)

3 Discussion group

We meet and discuss topics in all fields related to relativity, gravity and cos- mology usually every Friday.

4 Workshops and lectures organisation

We have recently organised the following workshops and lectures in Rikkyo University. ˆ JGRG28: The Twenty-Eighth Workshop on General Relativity and Gravi- tation in Japan, Monday the 5th to the 9th of November 2018, Rikkyo Uni- versity, Tokyo, Japan https://www2.rikkyo.ac.jp/web/jgrg28/jgrg28. php ˆ Singularity18: The Eighteenth Workshop on Singularities, Spacetimes and Related Physics, Tuesday the 27th to Thursday the 29th of December 2016, Rikkyo University, Tokyo, Japan http://www2.rikkyo.ac.jp/web/ harada/sing18/index.html ˆ Gmunu100: Public Lectures by Profs. Hideki Ishihara (Osaka City U) and Nobuyuki Kanda (Osaka City U) (22nd of Oct, 2015), Rikkyo University, Tokyo, Japan link ˆ Public Lecture: “The Story of Space and Time: From Myths to Reality” by Professor Sanjay Jhingan (Jamia Millia Islamia, Delhi) (Friday, 30th of May, 2014), Rikkyo University, Tokyo, Japan link ˆ HC13: The 13th Hayashi Chushiro Memorial Lectures by Profs. Humitaka Sato and Katsuhiko Sato, the 18th of December 2012, Rikkyo University, Tokyo, Japan link

ˆ Public Lecture: “ Black holes, wormholes and time machines ” by Pro- fessors Fumio Abe (Nagoya U) and Matt Visser (Victoria University of Wellington), the 27th of October 2012, Rikkyo University, Tokyo, Japan link ˆ Wormholes: The workshop on theories and possibilities of observations of wormholes, Saturday the 27th and Sunday the 28th of October 2012, Rikkyo University, Tokyo, Japan link

5 ˆ JGRG19: The Nineteenth Workshop on General Relativity and Gravita- tion in Japan, Monday the 30th of November to Friday the 4th of Decem- ber 2009, Rikkyo University, Tokyo, Japan http://www2.rikkyo.ac.jp/ web/jgrg19/ ˆ Singularity9: The Ninth Workshop on Singularities, Spacetimes and Re- lated Physics, Saturday the 12th to Monday the 14th of January 2008, Rikkyo University, Tokyo, Japan http://www2.rikkyo.ac.jp/web/harada/ sing9_index.html ˆ Rironkon19: The “Rironkon” Symposium on Theoretical Astronomy and Astrophysics, the 25th to the 27th of December 2006, Rikkyo University, Tokyo http://www.cfca.nao.ac.jp/~rironkon/sympo06/Sympo2006.htm

5 Researcher who belongs or belonged to our group

ˆ Kimura, Masashi (4/2019-) ˆ Jhingan, Sanjay (4/2016-) (Yamanashi Gakuin U)

ˆ Igata, Takahisa (4/2015-) ˆ Tanabe, Kentaro (4/2016-3/2017) ˆ Tsukamoto, Naoki (4/2008-9/2013, 10/2015-3/2016, currently in Hachi- nohe NCT)

ˆ Shimano, Masahiro (4/2007-, currently in Rikkyo Niiza Junior and Senior High School, Niiza) ˆ Tanaka, Tomo (4/2014-3/2015, 10/2015-3/2016, currently in Waseda U, Tokyo)

ˆ Uchikata, Nami (10/2015-3/2016, currently in Niigata U) ˆ Patil, Mandar (4/2015-3/2016, currently in IIT Dharwad) ˆ Maeda, Hideki (4/2006-3/2007, 4/2013-3/2014, currently in Hokkai-Gakuen U, Sapporo)

ˆ Houri, Tsuyoshi (4/2013-3/2014, currently in Maizuru NCT) ˆ Miyamoto, Umpei (10/2009-3/2013, currently in Akita Prefectural U, Yurihonjo) ˆ Saijo, Motoyuki (4/2008-5/2013, currently in Waseda U, Tokyo)

ˆ Tamaki, Takashi (4/2008-3/2009)

6 6 Visitors

We have recently had the following visitors for the period longer than three days:

ˆ 2020: Kokubu, Takafumi (Hunan Normal U, Changsha) ˆ 2019: Ogasawara, Kota (Kyoto U); Kokubu, Takafumi (Hunan Normal U, Changsha) ˆ 2018: Mena, Filipe (University of Minho, Braga); Kimura, Masashi (IST, Lisbon); Senovilla, Jos´eM. M. (University of the Basque Country UPV/EHU); Carr, Bernard J. (Queen Mary University of London); Gair, Jonathan R. (U Edinburgh); Hindmarsh, Mark B. (Sussex U.); Mota, David F. (Inst. Theor. Astrophys., Oslo); Starobinsky, Alexei A. (Landau Institute for Theoretical Physics, Moscow); Takahashi, Hirotaka (Nagaoka U. Tech.); Uzan, Jean-Philippe (Institut d’Astrophysique de Paris); Vennin, Vincent (Paris U. VII, APC)

ˆ 2017: Debnath, Ujjal (IIEST, Shibpur), Thaller, Maximilian (Chalmers University of Technology, Gothenburg) ˆ 2015: Kimura, Masashi (U Cambridge), Jhingan, Sanjay (Jamia Millia Islamia, Delhi)

ˆ 2014: Jhingan, Sanjay (Jamia Millia Islamia, Delhi) ˆ 2013: Kunstatter, Gabor (U Winnipeg); Bhattacharya, Sourav (Harish- Chandra Research Institute, Allahabad); Kimura, Masashi (YITP); Musco, Ilia (U Oslo) ˆ 2012: Maeda, Hideki (CECs, Valdivia); Visser, Matt (Victoria University of Wellington); Hayward, Sean A. (Shanghai Normal U) ˆ 2011: Jhingan, Sanjay (Jamia Millia Islamia, New Delhi); Kimura, Masashi (YITP) ˆ 2010: Novak, Jerome (Observatoire de Paris)

ˆ 2009: Bojowald, Martin (Penn State U , USA); Coley, Alan (Dalhousie U., Halifax , Canada); Craps, Ben (Vrije Universiteit Brussel, Belgium); Huang, Qing-Guo (KIAS , Korea); Hughes, Scott (MIT , USA); Razzaque, Soebur (Naval Research Lab., USA) ˆ 2008: Nolan, Brien C. (Dublin City U)

ˆ 2007: Tavakol, Reza (Queen Mary, U London); Narita, Makoto (National Taiwan U)

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