{"id":2917,"date":"2023-10-03T09:59:24","date_gmt":"2023-10-03T00:59:24","guid":{"rendered":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/?post_type=seminar&p=2917"},"modified":"2023-11-27T11:18:24","modified_gmt":"2023-11-27T02:18:24","slug":"close-to-detection-nano-hertz-gravitational-wave-background-2","status":"publish","type":"seminar","link":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/2917\/","title":{"rendered":"Close to Detection: Nano-Hertz Gravitational Wave Background"},"content":{"rendered":"

“KMI colloquium” 25th Oct (Wed)\u00a0 17\uff1a00 –\u00a0<\/span><\/strong><\/span>
\n<\/span><\/strong><\/span>Speaker<\/span>: Keitaro Takahashi<\/span>\u00a0<\/span><\/span>(Kumamoto University<\/span><\/span>)<\/span><\/span><\/span>
\n<\/span><\/span>Title: Close to Detection: <\/span>Nano<\/span>–<\/span>Hertz Gravitational Wave Background<\/span>
\n<\/span>Place: ES635& ZOOM<\/p>\n

<\/span>Abstract:<\/span> <\/span>Pulsar timing array is an<\/span> <\/span>experiment to detect gravitational waves with a frequency of<\/span> nanohertz by accurate long<\/span>–<\/span>term observation of pulsars. The pulsar timing array has various<\/span> systematic errors such as dispersion delays caused by interstellar plasma and uncertainty in the posit<\/span>ion and motion of solar system objects, which inhibit detection of gravitational wave signals.
\n<\/span>Recently, these have been signs of gravitational wave background through appropriate modeling of systematic errors and correlation between pulsars. The estimated<\/span> <\/span>power spectrum of gravitational<\/span> wave background is consistent with one from supermassive black hole binaries, but other possibilities such as secondary generation due to density fluctuations and inflation are not excluded. In this talk, I cover the princi<\/span>ples of pulsar timing arrays, data analysis methods and the physical interpretation<\/span> of recent results. In addition, I introduce the Indian Pulsar Timing Array, which is a joint project by Japan and India.<\/span><\/p>\n

\"\"<\/p>\n","protected":false},"featured_media":0,"template":"","tags":[],"seminar_category":[55],"acf":{"s_now_accepting":true,"s_date_order":"2023-10-25 17:00:00","s_date_end":null,"s_date_text":"17:00 - 18:00","s_text":"Keitaro Takahashi\u00a0(Kumamoto University)","s_place":"ES635\uff06ZOOM","s_place_other":"","s_categoryother":"","s_poster":"","s_poster2":"","s_slide":""},"yoast_head":"\nClose to Detection: Nano-Hertz Gravitational Wave Background - KMI - Nagoya University<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/2917\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Close to Detection: Nano-Hertz Gravitational Wave Background - KMI - Nagoya University\" \/>\n<meta property=\"og:description\" content=\"“KMI colloquium” 25th Oct (Wed)\u00a0 17\uff1a00 –\u00a0 Speaker: Keitaro Takahashi\u00a0(Kumamoto University) Title: Close to Detection: Nano–Hertz Gravitational Wave Background Place: ES635& ZOOM Abstract: Pulsar timing array is an experiment to detect gravitational waves with a frequency of nanohertz by accurate long–term observation of pulsars. 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