current status of space gravitational wave antenna decigo and b decigo

• DOI: 10.48550/arxiv.2006.13545
• Publication Date: 2021-02-22
• Authors: Naoki Aritomi; Shin-ichiro Sakai; Hirotaka Takahashi; Ken-ichi Oohara; Seiji Kawamura; Yousuke Itoh; Atsushi Nishizawa; K. Tsubono; Masa Katsu Fujimoto; Fumiko Kawazoe; Takashi Sato; Izumi Watanabe; Ryutaro Takahashi; S. Eguchi; Kiyotomo Ichiki; Kazunori Kohri; Hideki Asada; Shinji Tsujikawa; K. Izumi; Kunihito Ioka; Masaru Shibata; Masaru Shibata; Tomohiro Ishikawa; Masashi Ohkawa; Takashi Nakamura; Keisuke Taniguchi; Shigeo Nagano; Masa-aki Sakagami; Atsushi Taruya; Koji Nagano; Shoki Iwaguchi; Shinji Mukohyama; Toshifumi Futamase; Ken-ichi Ueda; Nobuyuki Kanda; Feng-Lei Hong; Shuhei Matsushita; Taigen Morimoto; Tomohiro Harada; Hajime Sotani; Jun'ichi Yokoyama; Takahiro Ito; Yoshiaki Himemoto; Norichika Sago; Takahiro Tanaka; Akito Araya; Shinya Kanemura; Kazuhiro Agatsuma; Shuichi Sato; Hisa-aki Shinkai; Isao Kawano; Sachiko Kuroyanagi; Keiko Kokeyama; Chul-Moon Yoo; Ayaka Shoda; Takeshi Takashima; Takeshi Chiba; Hideki Ishihara; Yoshinori Nakayama; Kazuhiro Nakazawa; Masaki Ando; Yuta Michimura; Shuichiro Yokoyama; Keiichi Maeda; Motoyuki Saijo; Motohiro Enoki; Kazuhiro Hayama; Satoshi Ikari; Kei Kotake; Mizuhiko Hosokawa; Naoki Seto; Tomotada Akutsu; Ryuichi Fujita; Shiho Kobayashi; Kent Yagi; Takeo Naito; Yasufumi Kojima; Takashi Hiramatsu; Zong Hong Zhu; Ken-ichi Nakao; Hiroyuki Nakano; Mitsuru Musha; Akitoshi Ueda; Shinichi Nakasuka; Rika Yamada; Takamori Akiteru; Kentaro Somiya; Kouji Nakamura
• Keywords: F31 Expectation and estimation of gravitational radiation; 0103 physical sciences; FOS: Physical sciences; General Relativity and Quantum Cosmology (gr-qc); Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik; F30 Instrumentation and technique; 01 natural sciences; 7. Clean energy; QC; General Relativity and Quantum Cosmology; QB

Abstract The Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future Japanese space mission with a frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the detection of primordial gravitational waves, which could have been produced during the inflationary period right after the birth of the Universe. There are many other scientific objectives of DECIGO, including the direct measurement of the acceleration of the expansion of the Universe, and reliable and accurate predictions of the timing and locations of neutron star/black hole binary coalescences. DECIGO consists of four clusters of observatories placed in heliocentric orbit. Each cluster consists of three spacecraft, which form three Fabry–Pérot Michelson interferometers with an arm length of 1000 km. Three DECIGO clusters will be placed far from each other, and the fourth will be placed in the same position as one of the other three to obtain correlation signals for the detection of primordial gravitational waves. We plan to launch B-DECIGO, which is a scientific pathfinder for DECIGO, before DECIGO in the 2030s to demonstrate the technologies required for DECIGO, as well as to obtain fruitful scientific results to further expand multi-messenger astronomy.