{"id":3344,"date":"2025-05-19T10:34:53","date_gmt":"2025-05-19T01:34:53","guid":{"rendered":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/?post_type=seminar&p=3344"},"modified":"2025-05-19T10:35:28","modified_gmt":"2025-05-19T01:35:28","slug":"chords-of-a-black-hole-ringing-probing-extreme-gravity-with-gravitational-wave-observations","status":"publish","type":"seminar","link":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/","title":{"rendered":"Chords of a black hole ringing: Probing extreme gravity with gravitational-wave observations"},"content":{"rendered":"

“KMI colloquium” 11th Jun. (Wed)\u00a0 17\uff1a00 – 18 : 00<\/span><\/strong><\/span>
\n<\/span><\/span>Speaker<\/span>: Naritaka Oshita (Hakubi Center for Advanced Research\/YITP, Kyoto University)<\/span><\/span><\/span>
\n<\/span><\/span><\/span><\/strong><\/span><\/span>Title: Chords of a black hole ringing: <\/span>Probing extreme gravity with gravitational-wave observations
\n<\/span>Place: ES635 & ZOOM<\/span>
\n<\/span><\/p>\n

Abstract: As musical instruments resonate with their characteristic vibrational modes, black holes also ring with their distinctive tones. These tones are known as quasi-normal modes (QNMs), and their frequencies are uniquely determined by the black hole\u2019s mass and spin. After the merger of a binary black hole system, the remnant black hole exhibits its free oscillations, emitting gravitational waves known as the ringdown signal. The ringdown contains multiple QNMs, and it is expected that black hole spectroscopy\u2014resolving these modes individually\u2014will enable precision tests of gravity in the strong-field regime.
\n<\/span>In this colloquium, I will present an overview of black hole perturbation studies from both theoretical and observational perspectives. I will then introduce recent progress in ringdown modeling based on the universal excitability of QNMs and the black hole S-matrix, and will discuss its implications for probing strong gravity.<\/span><\/p>\n

<\/span>\"\"<\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

<\/span><\/p>\n","protected":false},"featured_media":0,"template":"","tags":[],"seminar_category":[55],"acf":{"s_now_accepting":true,"s_date_order":"2025-06-11 17:00:00","s_date_end":"2025-06-11 18:00:00","s_date_text":"17:00 - 18:00","s_text":"Naritaka Oshita (Hakubi Center for Advanced Research\/YITP, Kyoto University)","s_place":"ES635 and ZOOM\u00a0","s_place_other":"","s_categoryother":"","s_poster":"","s_poster2":"","s_slide":""},"yoast_head":"\nChords of a black hole ringing: Probing extreme gravity with gravitational-wave observations - 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\/3344\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chords of a black hole ringing: Probing extreme gravity with gravitational-wave observations - KMI - Nagoya University\" \/>\n<meta property=\"og:description\" content=\"“KMI colloquium” 11th Jun. (Wed)\u00a0 17\uff1a00 – 18 : 00 Speaker: Naritaka Oshita (Hakubi Center for Advanced Research\/YITP, Kyoto University) Title: Chords of a black hole ringing: Probing extreme gravity with gravitational-wave observations Place: ES635 & ZOOM Abstract: As musical instruments resonate with their characteristic vibrational modes, black holes also ring with their distinctive tones. These tones are known as quasi-normal modes (QNMs), and their frequencies are uniquely determined by the black hole\u2019s mass and spin. After the merger of …\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/\" \/>\n<meta property=\"og:site_name\" content=\"KMI - Nagoya University\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-19T01:35:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2025\/05\/Colloquium_Oshita_20250611.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/\",\"url\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/\",\"name\":\"Chords of a black hole ringing: Probing extreme gravity with gravitational-wave observations - KMI - Nagoya University\",\"isPartOf\":{\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2025\/05\/Colloquium_Oshita_20250611.png\",\"datePublished\":\"2025-05-19T01:34:53+00:00\",\"dateModified\":\"2025-05-19T01:35:28+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/#primaryimage\",\"url\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2025\/05\/Colloquium_Oshita_20250611.png\",\"contentUrl\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2025\/05\/Colloquium_Oshita_20250611.png\",\"width\":1965,\"height\":2780},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Seminars\",\"item\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Chords of a black hole ringing: Probing extreme gravity with gravitational-wave observations\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/#website\",\"url\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/\",\"name\":\"KMI - Nagoya University\",\"description\":\"Nagoya University: Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI)\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Chords of a black hole ringing: Probing extreme gravity with gravitational-wave observations - KMI - Nagoya University","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3344\/","og_locale":"en_US","og_type":"article","og_title":"Chords of a black hole ringing: Probing extreme gravity with gravitational-wave observations - KMI - Nagoya University","og_description":"“KMI colloquium” 11th Jun. 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