{"693692":{"#nid":"693692","#data":{"type":"event","title":"CRA SEMINAR | Dr. Misha Rashkovetskyi | Ohio State University | Host: Prof. John Wise","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ESpeaker:\u003C\/strong\u003E Dr. Misha Rashkovetskyi\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHost: \u003C\/strong\u003EProf. John Wise\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETitle: \u003C\/strong\u003ESpectral survey instrument reveals notes of discord with cosmic sound waves: DESI overview, BAO measurements and their cosmological implications\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EWe have known that the Universe is vast and expands with acceleration for many years, yet the physical origin of this acceleration remains an open question. While the concordance cosmological model, \u039bCDM, has been remarkably successful, recent cutting-edge observational results suggest that dark energy may evolve with time or that the standard model might not keep up with all the highest-quality data.\u003C\/p\u003E\u003Cp\u003EIn this talk, I will introduce baryon acoustic oscillations (BAO), relic sound waves from the early Universe whose imprint in the large-scale distribution of galaxies provides a robust standard ruler for measuring the cosmic expansion history. I will then present an overview of the Dark Energy Spectroscopic Instrument (DESI), a 5000-object fiber spectrograph with robotic positioning highly optimized for conducting a spectroscopic galaxy survey at a record-breaking speed and scale.\u003C\/p\u003E\u003Cp\u003EOne of DESI\u0027s main objectives\u0026nbsp;is to measure BAO across cosmic time. I will discuss the methodology and results of the recent BAO analysis from DESI Data Release 2, based on the first three years of observations. Combining these measurements with cosmic microwave background and Type Ia supernova data yields intriguing indications of departures from the standard \u039bCDM model, including possible evidence for evolving dark energy.\u003C\/p\u003E\u003Cp\u003EI will conclude with an outlook on upcoming DESI cosmological analyses, including full-shape clustering measurements from Data Release 2 and BAO results from the 5-year Data Release 3.\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003EAbstract\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EWe have known that the Universe is vast and expands with acceleration for many years, yet the physical origin of this acceleration remains an open question. While the concordance cosmological model, \u039bCDM, has been remarkably successful, recent cutting-edge observational results suggest that dark energy may evolve with time or that the standard model might not keep up with all the highest-quality data.\u003C\/p\u003E\u003Cp\u003EIn this talk, I will introduce baryon acoustic oscillations (BAO), relic sound waves from the early Universe whose imprint in the large-scale distribution of galaxies provides a robust standard ruler for measuring the cosmic expansion history. I will then present an overview of the Dark Energy Spectroscopic Instrument (DESI), a 5000-object fiber spectrograph with robotic positioning highly optimized for conducting a spectroscopic galaxy survey at a record-breaking speed and scale.\u003C\/p\u003E\u003Cp\u003EOne of DESI\u0027s main objectives\u0026nbsp;is to measure BAO across cosmic time. I will discuss the methodology and results of the recent BAO analysis from DESI Data Release 2, based on the first three years of observations. Combining these measurements with cosmic microwave background and Type Ia supernova data yields intriguing indications of departures from the standard \u039bCDM model, including possible evidence for evolving dark energy.\u003C\/p\u003E\u003Cp\u003EI will conclude with an outlook on upcoming DESI cosmological analyses, including full-shape clustering measurements from Data Release 2 and BAO results from the 5-year Data Release 3.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"CRA SEMINAR | Dr. Misha Rashkovetskyi | Ohio State University | Host: Prof. John Wise"}],"uid":"30957","created_gmt":"2026-11-02 17:14:50","changed_gmt":"2026-11-02 17:19:49","author":"Shaun Ashley","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2026-11-05T15:30:00-05:00","event_time_end":"2026-11-05T16:30:00-05:00","event_time_end_last":"2026-11-05T16:30:00-05:00","gmt_time_start":"2026-11-05 20:30:00","gmt_time_end":"2026-11-05 21:30:00","gmt_time_end_last":"2026-11-05 21:30:00","rrule":null,"timezone":"America\/New_York"},"location":"College of Computing Building Rm CCB103","extras":[],"hg_media":{"681618":{"id":"681618","type":"image","title":"Rashkovetskyi--Michael-11.4.26.jpg","body":null,"created":"1793639900","gmt_created":"2026-11-02 17:18:20","changed":"1793639900","gmt_changed":"2026-11-02 17:18:20","alt":"Rashkovetskyi--Michael-11.4.26.jpg","file":{"fid":"266050","name":"Rashkovetskyi--Michael-11.4.26.jpg","image_path":"\/sites\/default\/files\/2026\/11\/02\/Rashkovetskyi--Michael-11.4.26.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2026\/11\/02\/Rashkovetskyi--Michael-11.4.26.jpg","mime":"image\/jpeg","size":6353,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2026\/11\/02\/Rashkovetskyi--Michael-11.4.26.jpg?itok=Vtt4lIaJ"}}},"media_ids":["681618"],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[],"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":""}}}