{ "143132-21892189": { "datetime_modified":"20260217T111612", "datetime_start":"20260218T130000", "datetime_end":"20260218T140000", "has_end_time":1, "date_start":"2026-02-18", "date_end":"2026-02-18", "time_start":"13:00:00", "time_end":"14:00:00", "time_zone":"America\/Detroit", "event_title":"HET Brown Bag Seminar | Bulk Locality from Infrared Entanglement", "occurrence_title":"", "combined_title":"HET Brown Bag Seminar | Bulk Locality from Infrared Entanglement: Gautam Satishchandran (Princeton)", "event_subtitle":"Gautam Satishchandran (Princeton)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"For quantum field theories coupled to any massless fields, one generally encounters \u201cIR divergences\u201d which arise due to the fact that the asymptotic description of the state contains an infinite number of soft radiative quanta. These quanta have recently gained interest due to their connections to unitarity, asymptotic symmetries and the memory effect. However, for the description of any bulk experiment, these quanta are generally viewed as a nuisance with little physical relevance for the predictions of any bulk, finite time observable.\n\nIn this talk, I will explain that this is not the case. In fact, the situation is quite the opposite: all local physical observables and phenomena depend on the entanglement and absorption of soft radiation. I will explain (1) how this phenomenon arises and (2) why it was missed in the literature and (3) why this result agrees with the predictions of collider experiments. I will primarily focus on the case of QED with and will comment on the analogous issues in QED with massless electrons, Yang-Mills theories and Quantum Gravity.", "occurrence_notes":null, "guid":"143132-21892189@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143132", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3481", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["Brown Bag Seminar","Talk","Science","Physics","Lecture","brown bag"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics", "group_id":"4286", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" }, { "group_name":"HET Brown Bag Series", "group_id":"3805", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics Brown Bag Seminars", "group_id":"4865", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21892189 } , "144373-21895243": { "datetime_modified":"20260123T121714", "datetime_start":"20260218T132000", "datetime_end":"20260218T135000", "has_end_time":1, "date_start":"2026-02-18", "date_end":"2026-02-18", "time_start":"13:20:00", "time_end":"13:50:00", "time_zone":"America\/Detroit", "event_title":"Eva Albalghiti, carillon", "occurrence_title":"", "combined_title":"Eva Albalghiti, carillon", "event_subtitle":"", "event_type":"Performance", "event_type_id":"15", "description":"Eva Albalghiti performs on the Ann & Robert H. Lurie Carillon, an instrument of 60 bells with the lowest bell (bourdon) weighing 6 tons.\n\nThirty-minute recitals are performed on the Lurie Carillon every weekday that classes are in session. During these recitals, visitors may take the elevator to level 2 to view the largest bells, or to level 3 to see the carillonist performing. (Visitors subject to acrophobia are recommended to visit level 2 only.) An optional spiral stairway between levels 2 and 3 allows for up-close views of some of the largest bells.", "occurrence_notes":null, "guid":"144373-21895243@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144373", "building_id":"1000394", "building_name":"Lurie Ann & Robert H. Tower", "campus_maps_id":"91", "room":"", "location_name":"Lurie Ann & Robert H. Tower", "has_livestream":0, "cost":"Free - no tickets required", "tags":["Free","Music","North Campus"], "website":"", "sponsors":[ { "group_name":"School of Music, Theatre & Dance (SMTD)", "group_id":"155", "website":"http:\/\/smtd.umich.edu\/events" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/01\/event_144373_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_144373_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21895243 } }