{ "151080-21910843": { "datetime_modified":"20261008T191237", "datetime_start":"20261028T120000", "datetime_end":"20261028T130000", "has_end_time":1, "date_start":"2026-10-28", "date_end":"2026-10-28", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"HET Brown Bag Seminar | What is the simplest holographic matrix model?", "occurrence_title":"", "combined_title":"HET Brown Bag Seminar | What is the simplest holographic matrix model?: Harish Murali (Stanford)", "event_subtitle":"Harish Murali (Stanford)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"I\u2019ll talk about a Hermitian two matrix model called the Hoppe model, which has an interesting strong coupling limit where the matrices commute with each other. Furthermore, there exists an emergent area preserving diffeomorphism symmetry of this model at strong coupling, which allows us to completely solve it at leading order. The solution for all n-point connected correlators takes the form of a Witten diagram-like expansion in an emergent two-dimensional spacetime. I\u2019ll also briefly talk about commuting strong coupling limits in more general multi-matrix integrals, including supersymmetric ones. The talk will be based on https:\/\/arxiv.org\/pdf\/2608.14781 and https:\/\/arxiv.org\/pdf\/2607.21593.", "occurrence_notes":null, "guid":"151080-21910843@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151080", "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","Lecture","Physics","Science","brown bag"], "website":"", "sponsors":[ { "group_name":"HET Brown Bag Series", "group_id":"3805", "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":21910843 } , "151159-21910990": { "datetime_modified":"20261022T124900", "datetime_start":"20261104T120000", "datetime_end":"20261104T130000", "has_end_time":1, "date_start":"2026-11-04", "date_end":"2026-11-04", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"HET Brown Bag Seminar | Suppressed Quantum Effects of Weakly Coupled Waves", "occurrence_title":"", "combined_title":"HET Brown Bag Seminar | Suppressed Quantum Effects of Weakly Coupled Waves: Kevin Zhou (Berkeley)", "event_subtitle":"Kevin Zhou (Berkeley)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Searches for axion dark matter and gravitational waves are rapidly expanding, with new experiments deploying quantum sensing techniques to reach unprecedented precision. But does one need to account for the quantum nature of the axion or GW itself? I will exhibit two severe obstructions. First, realistic detectors cannot resolve the fundamental modes of a field; instead they couple to coarse-grained \"effective\" modes, which often washes out nonclassical effects. Second, all nonclassical effects are suppressed by extra powers of the weak coupling, making them much harder to detect than the waves themselves. This suppression applies to all observables, including quadrature and number statistics, entanglement, and decoherence, and rules out many proposed methods to detect the quantization of gravity.", "occurrence_notes":null, "guid":"151159-21910990@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151159", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3481", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["brown bag","Brown Bag Seminar","Lecture","Physics","Science","Talk"], "website":"", "sponsors":[ { "group_name":"HET Brown Bag Series", "group_id":"3805", "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":21910990 } , "151160-21910991": { "datetime_modified":"20261023T072027", "datetime_start":"20261111T120000", "datetime_end":"20261111T130000", "has_end_time":1, "date_start":"2026-11-11", "date_end":"2026-11-11", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"HET Brown Bag Seminar | Growing large SMBH at early times with dark atoms", "occurrence_title":"", "combined_title":"HET Brown Bag Seminar | Growing large SMBH at early times with dark atoms: Akshay Ghalsasi (Harvard)", "event_subtitle":"Akshay Ghalsasi (Harvard)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Observations by JWST have indicated the presence of large SMBH within the first 500 Myr of the universe. The existence of these black holes require the BH seeds to grow faster than allowed by the Eddington limit. In this talk I will consider the growth of these black holes if a small component of dark matter was dissipative in nature. Using dark atoms as a concrete example of dissipative dark matter, we show that it is possile to grow large BHs in the early universe through accretion of dark atoms or by starting out with larger seeds.", "occurrence_notes":null, "guid":"151160-21910991@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151160", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3481", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["Physics","Talk","Science","Lecture","Brown Bag Seminar","brown bag"], "website":"", "sponsors":[ { "group_name":"HET Brown Bag Series", "group_id":"3805", "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":21910991 } , "151289-21911322": { "datetime_modified":"20260901T084933", "datetime_start":"20261118T120000", "datetime_end":"20261118T130000", "has_end_time":1, "date_start":"2026-11-18", "date_end":"2026-11-18", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"HET Brown Bag |", "occurrence_title":"", "combined_title":"HET Brown Bag |: Aritra Saha (Texas A&M)", "event_subtitle":"Aritra Saha (Texas A&M)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"tbd", "occurrence_notes":null, "guid":"151289-21911322@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151289", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3481", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["brown bag","Brown Bag Seminar","Lecture","Physics","Science","Talk"], "website":"", "sponsors":[ { "group_name":"HET Brown Bag Series", "group_id":"3805", "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":21911322 } , "151161-21910992": { "datetime_modified":"20260829T095001", "datetime_start":"20261202T120000", "datetime_end":"20261202T130000", "has_end_time":1, "date_start":"2026-12-02", "date_end":"2026-12-02", "time_start":"12:00:00", "time_end":"13:00:00", "time_zone":"America\/Detroit", "event_title":"HET Brown Bag Seminar |", "occurrence_title":"", "combined_title":"HET Brown Bag Seminar |: Taegyu Lee (Indiana)", "event_subtitle":"Taegyu Lee (Indiana)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"tbd", "occurrence_notes":null, "guid":"151161-21910992@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151161", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3481", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["brown bag","Brown Bag Seminar","Lecture","Physics","Science","Talk"], "website":"", "sponsors":[ { "group_name":"HET Brown Bag Series", "group_id":"3805", "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":21910992 } }