{"id":3459,"date":"2025-12-15T10:34:19","date_gmt":"2025-12-15T01:34:19","guid":{"rendered":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/?post_type=seminar&p=3459"},"modified":"2025-12-15T10:44:16","modified_gmt":"2025-12-15T01:44:16","slug":"the-trichotomy-of-primordial-black-holes-initial-conditions","status":"publish","type":"seminar","link":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3459\/","title":{"rendered":"The trichotomy of Primordial Black Holes initial conditions"},"content":{"rendered":"

In this talk, I will show that the formation of primordial black holes, in an asymptotically flat and radiation dominated Friedman-Robertson-Walker (FRW) Universe, is not mainly determined by the behaviour of the smoothed linear over-density at its maximum, as earlier thought, but also by the three-dimensional curvature at smaller (but super-horizon) scales, which is called \u201cthe core\u201d.
\nI will present three classes of initial condition characterised by an open, closed or flat FRW core. I will motivate the use of the three-dimensional curvature as the key parameter to determine the threshold of PBH formation.<\/p>\n

\n

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\n\u305d\u3057\u3066\u3001\u958b\u3044\u305f\u30fb\u9589\u3058\u305f\u30fb\u5e73\u5766\u3068\u3044\u3046FRW\u30b3\u30a2\u306b\u3088\u3063\u3066\u7279\u5fb4\u3065\u3051\u3089\u308c\u308b3\u3064\u306e\u521d\u671f\u6761\u4ef6\u3092\u89e3\u8aac\u3057\u3001PBH\u5f62\u6210\u306e\u30b9\u30ec\u30c3\u30b7\u30e7\u30eb\u30c9\u3092\u6c7a\u5b9a\u3059\u308b\u305f\u3081\u306e\u4e3b\u8981\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3068\u3057\u3066\u4e09\u6b21\u5143\u66f2\u7387\u3092\u3082\u3061\u3044\u308b\u3053\u3068\u306e\u59a5\u5f53\u6027\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"featured_media":0,"template":"","tags":[],"seminar_category":[154],"acf":{"s_now_accepting":true,"s_date_order":"2025-12-16 10:30:00","s_date_end":"2025-12-16 11:30:00","s_date_text":"10:30 - 11:30","s_text":"Laia Montell\u00e0 Manuel (Universitat de Barcelona, ICCUB)","s_place":"ES635","s_place_other":"","s_categoryother":"","s_poster":"","s_poster2":"","s_slide":""},"yoast_head":"\nThe trichotomy of Primordial Black Holes initial conditions - 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\/3459\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The trichotomy of Primordial Black Holes initial conditions - KMI - Nagoya University\" \/>\n<meta property=\"og:description\" content=\"In this talk, I will show that the formation of primordial black holes, in an asymptotically flat and radiation dominated Friedman-Robertson-Walker (FRW) Universe, is not mainly determined by the behaviour of the smoothed linear over-density at its maximum, as earlier thought, but also by the three-dimensional curvature at smaller (but super-horizon) scales, which is called \u201cthe core\u201d. 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