{"680783":{"#nid":"680783","#data":{"type":"event","title":"Special CRA Seminar - Dr. Jonathan C. Tan","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ESpeaker:\u0026nbsp;\u003C\/strong\u003EProf. Jonathan C. Tan\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHost: \u003C\/strong\u003EProf. John Wise\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETitle: \u003C\/strong\u003EThe Origin of Supermassive Black Holes from Pop III.1 Seeds\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe origin of supermassive black holes (SMBHs) is a key open question for contemporary astrophysics and cosmology. Here we discuss the predictions of a model of SMBH formation from Pop III.1 protostars, i.e., metal-free\u0026nbsp;stars forming in locally isolated dark matter minihalos, where dark matter annihilation has a chance to alter the structure of the star allowing growth to supermassive scales (Banik, Tan \u0026amp; Monaco 2019; Singh, Monaco \u0026amp; Tan\u0026nbsp;2023; Cammelli et al. 2025). The model predicts that all SMBHs form very early in the Universe (within a few 100 Myr, i.e., by z ~ 20) with a spatial distribution that is initially relatively unclustered. We also present predictions\u0026nbsp;for SMBH occupation fractions, host galaxy properties, frequency of binary SMBHs and the gravitational wave background from this SMBH population. These predictions are compared to latest results from the Hubble Space\u0026nbsp;Telescope, James Webb Spact Telescope and pulsar timing array observations.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003EAbstract:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThe origin of supermassive black holes (SMBHs) is a key open question for contemporary astrophysics and cosmology. Here we discuss the predictions of a model of SMBH formation from Pop III.1 protostars, i.e., metal-free\u0026nbsp;stars forming in locally isolated dark matter minihalos, where dark matter annihilation has a chance to alter the structure of the star allowing growth to supermassive scales (Banik, Tan \u0026amp; Monaco 2019; Singh, Monaco \u0026amp; Tan\u0026nbsp;2023; Cammelli et al. 2025). The model predicts that all SMBHs form very early in the Universe (within a few 100 Myr, i.e., by z ~ 20) with a spatial distribution that is initially relatively unclustered. We also present predictions\u0026nbsp;for SMBH occupation fractions, host galaxy properties, frequency of binary SMBHs and the gravitational wave background from this SMBH population. These predictions are compared to latest results from the Hubble Space\u0026nbsp;Telescope, James Webb Spact Telescope and pulsar timing array observations.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Special CRA Seminar | Prof. Jonathan C. Tan | Chalmers \/ U. Virginia | Host: Prof. John Wise"}],"uid":"30957","created_gmt":"2025-02-27 21:12:53","changed_gmt":"2025-02-27 21:47:29","author":"Shaun Ashley","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2025-03-07T13:00:00-05:00","event_time_end":"2025-03-07T14:00:00-05:00","event_time_end_last":"2025-03-07T14:00:00-05:00","gmt_time_start":"2025-03-07 18:00:00","gmt_time_end":"2025-03-07 19:00:00","gmt_time_end_last":"2025-03-07 19:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Gilbert Boggs Building Rm B1-44","extras":[],"hg_media":{"676420":{"id":"676420","type":"image","title":"Jonathan-Tan-3.7.25--Host-John-Wise-.jpg","body":null,"created":"1740692729","gmt_created":"2025-02-27 21:45:29","changed":"1740692729","gmt_changed":"2025-02-27 21:45:29","alt":"Jonathan C. Tan","file":{"fid":"260205","name":"Jonathan-Tan-3.7.25--Host-John-Wise-.jpg","image_path":"\/sites\/default\/files\/2025\/02\/27\/Jonathan-Tan-3.7.25--Host-John-Wise-.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/02\/27\/Jonathan-Tan-3.7.25--Host-John-Wise-.jpg","mime":"image\/jpeg","size":4218,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/02\/27\/Jonathan-Tan-3.7.25--Host-John-Wise-.jpg?itok=YMXS-fDK"}}},"media_ids":["676420"],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[{"id":"166937","name":"School of Physics"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"177814","name":"Postdoc"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}