{ "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","Brown Bag Seminar","Lecture","Physics","Science"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "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 } , "151804-21912196": { "datetime_modified":"20261022T161414", "datetime_start":"20261030T150000", "datetime_end":"20261030T160000", "has_end_time":1, "date_start":"2026-10-30", "date_end":"2026-10-30", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | Fundamental Physics from Large-Scale Structure Cosmology", "occurrence_title":"", "combined_title":"HET Seminar | Fundamental Physics from Large-Scale Structure Cosmology: Mikhail Ivanov (MIT)", "event_subtitle":"Mikhail Ivanov (MIT)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"I will present a program for extracting cosmological information by combining effective field theory techniques with data from galaxy surveys. I will highlight previous successes of this program and share new results from my independent re-analyses of the public DESI survey data, which incorporate additional information from higher-order statistics. These results include new measurements of fundamental cosmological parameters and tight constraints on neutrino masses, cosmic inflation, dark matter, and the dark energy equation of state. I will argue that the dark energy results may hint at new a fundamental force between dark matter and dark energy, which can be tested with upcoming large-scale structure data.", "occurrence_notes":null, "guid":"151804-21912196@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151804", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"4404", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["Talk","High Energy Theory Seminar","Lecture","Physics","Science","Seminar"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "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":21912196 } , "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":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "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 } , "150864-21910328": { "datetime_modified":"20261022T210707", "datetime_start":"20261106T150000", "datetime_end":"20261106T160000", "has_end_time":1, "date_start":"2026-11-06", "date_end":"2026-11-06", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | On the origin of Flavor and CP Violation", "occurrence_title":"", "combined_title":"HET Seminar | On the origin of Flavor and CP Violation: Claudio Manzari (IAS)", "event_subtitle":"Claudio Manzari (IAS)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"I will present recent work on several aspects of flavor physics, motivated by suggestive patterns in high-precision data. First, I will discuss CKM unitarity constraints, focusing on the angles of the unitarity triangle and on intriguing hints of spontaneous CP violation. Then, I will argue that Standard Model running of the Yukawa couplings points to quark\u2013lepton unification at a surprisingly low scale. Simple Pati\u2013Salam theories of flavor can realize this for all three generations, with predictions within reach of upcoming searches for charged-lepton flavor violation.", "occurrence_notes":null, "guid":"150864-21910328@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150864", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"4404", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["Physics","High Energy Theory Seminar","Science","Seminar"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "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":21910328 } , "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":["Science","brown bag","Brown Bag Seminar","Lecture","Physics","Talk"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "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 } , "151162-21910993": { "datetime_modified":"20261026T085513", "datetime_start":"20261113T150000", "datetime_end":"20261113T160000", "has_end_time":1, "date_start":"2026-11-13", "date_end":"2026-11-13", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | Euclidean Wormholes and Axion Cosmology", "occurrence_title":"", "combined_title":"HET Seminar | Euclidean Wormholes and Axion Cosmology: Gary Shiu (Wisconsin)", "event_subtitle":"Gary Shiu (Wisconsin)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Axions arise ubiquitously in theories of particle physics and quantum gravity and may play important roles in cosmology, from inflation and dark matter to dark energy. This raises a basic question: does quantum gravity constrain the allowed parameter space of axions, and can such constraints have observable consequences? I will discuss how Euclidean wormholes provide a surprising connection between these questions and quantum gravity. I will first review the axionic Weak Gravity Conjecture (aWGC), including the importance of its order-one coefficient for axion phenomenology, and then describe how Euclidean wormholes may give rise to this bound. I will discuss the perturbative stability of axion wormholes and their explicit realization in string theory, both in flat space and in AdS. Finally, I will present recent work showing that the aWGC can arise directly from the nonperturbative fragmentation of Euclidean wormholes into charged defects. Requiring such fragmentation to lower the Euclidean action fixes the action-to-charge bound and its order-one coefficient, and reveals a direct connection to the Imaginary Distance Bound. This suggests that quantum-gravitational constraints on axions can be understood as conditions on the non-perturbative stability of gravitational saddles, with implications for axion cosmology and the consistency of effective field theories.", "occurrence_notes":null, "guid":"151162-21910993@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151162", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["High Energy Theory Seminar","Lecture","Physics","Science","Seminar","Talk"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "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":"", 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