{ "144293-21895126": { "datetime_modified":"20260122T101228", "datetime_start":"20260128T150000", "datetime_end":"20260128T160000", "has_end_time":1, "date_start":"2026-01-28", "date_end":"2026-01-28", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Department Colloquium | Programmable Topology in Hybrid Light-Matter Systems", "occurrence_title":"", "combined_title":"Department Colloquium | Programmable Topology in Hybrid Light-Matter Systems: Hui Deng (U-M Physics)", "event_subtitle":"Hui Deng (U-M Physics)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Quantum geometry has emerged as a new framework that unites different disciplines and underpins novel transport and nonlinear phenomena in topological states of matter. In this colloquium, I will discuss an emerging system for topological studies: designable hybrid light-matter fluids. By integration of 2D material excitations \u2014 such as moir\u00e9 excitons and Fermi polarons \u2014 with engineered photonic crystals, we create a platform where topology can be designed and dynamically controlled.", "occurrence_notes":null, "guid":"144293-21895126@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144293", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Physics","Science"], "website":"", "sponsors":[ { "group_name":"Department Colloquia", "group_id":"3804", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "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":"", 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"datetime_end":"20260128T160000", "has_end_time":1, "date_start":"2026-01-28", "date_end":"2026-01-28", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Privacy for Populations at Risk: Supporting Journalists Facing Attacks in the Digital Age", "occurrence_title":"", "combined_title":"Privacy for Populations at Risk: Supporting Journalists Facing Attacks in the Digital Age: Elodie Vialle - International Journalist and Human Rights Activist", "event_subtitle":"Elodie Vialle - International Journalist and Human Rights Activist", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Celebrating International Data Privacy Day!\r\n\r\nElodie Vialle, an international journalist and human rights activist, will discuss how journalists\u2014particularly women journalists and journalists from marginalized communities\u2014are increasingly targeted in online spaces, from coordinated harassment to surveillance and AI-amplified attacks. Drawing on real-world cases, the session will explore practical responses to mitigate harm while safeguarding journalistic work and freedom of expression.\r\n\r\nLynette Clemetson, Charles R. Eisendrath Director of Wallace House, will facilitate Q&A time after the keynote presentation.\r\n\r\nJoin us on Zoom on the day of the event: https:\/\/umich.zoom.us\/j\/97875254127\r\n\r\nAdd this event to your Google calendar: https:\/\/calendar.google.com\/calendar\/u\/0\/r\/eventedit\/copy\/MmtxZHR1aW5raGw4bGZkOWg0N3E5NGNoamYgdW1pY2guZWR1X2ZkczI0Z2V2cGE0MnY5NTc2bG5wZTJjbWxrQGc", "occurrence_notes":null, "guid":"143915-21894254@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143915", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Virtual", "has_livestream":1, "livestream_type":"zoom", "livetream_require_login":0, "livestream_id":"97875254127", "livestream_link":"https:\/\/umich.zoom.us\/j\/97875254127", "cost":"", "tags":["Academic Technology At Michigan","Data Science","digital","Digital Culture","Digital Cultures","Digital Studies","digital technology","Discussion","Ethics","Free","Human Rights, Sustainability, Social Impact","Humanities","Information and Technology","information policy","information technology","Interdisciplinary","internet security","it","Journalism","Law","michigan it","privacy","Public Policy","Social Impact","Social Justice","Social Media","Social Sciences","Sociology","Talk","technology","Webinar"], "website":"https:\/\/umich.zoom.us\/j\/97875254127", "sponsors":[ { "group_name":"Information and Technology Services (ITS)", "group_id":"1179", "website":"https:\/\/x.com\/umichTECH" }, { "group_name":"Information Assurance", "group_id":"1128", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/01\/event_143915_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_143915_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21894254 } , "144436-21895352": { "datetime_modified":"20260125T112641", "datetime_start":"20260128T150000", "datetime_end":"20260128T160000", "has_end_time":1, "date_start":"2026-01-28", "date_end":"2026-01-28", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Trees and SL2", "occurrence_title":"", "combined_title":"Trees and SL2: Aaron Kim", "event_subtitle":"Aaron Kim", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"A common theme in mathematics is to understand algebraic objects using their actions on geometric spaces. Bass\u2014Serre theory is one instance of this approach where one studies groups via their actions on trees. I will give an introduction to the simplest case of Bass\u2014Serre theory and build a dictionary between gluing of spaces, amalgamation of groups, and actions on trees. This dictionary gives us a surprising amount of information about the structure of groups, especially about their torsion subgroups. I will demonstrate this by applying the theory to SL2(Z), SL2(Q_p), and SL2(F_p((t))).", "occurrence_notes":null, "guid":"144436-21895352@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144436", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"EH3866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Student Dynamics\/Geometry\/Topology Seminar - Department of Mathematics", "group_id":"4909", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "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":21895352 } , "141272-21888524": { "datetime_modified":"20260114T220853", "datetime_start":"20260128T153000", "datetime_end":"20260128T170000", "has_end_time":1, "date_start":"2026-01-28", "date_end":"2026-01-28", "time_start":"15:30:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Seminar: On the P=C conjecture", "occurrence_title":"", "combined_title":"Algebraic Geometry Seminar: On the P=C conjecture: Woonam Lim (Yonsei University)", "event_subtitle":"Woonam Lim (Yonsei University)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"I will introduce the P=C conjecture which is an analogue of the P=W conjecture in the setting of a del Pezzo surface S. The main character of the conjecture is the moduli space M of one-dimensional sheaves on S. The perverse filtration records the topology of the Hitchin-type fibration, while the Chern filtration records the shape of tautological relations. The perverse filtration is of particular interest because it conjecturally categorifies the Gopakumar-Vafa invariants of a local Calabi-Yau 3-fold. This is a joint work with Y. Kononov, M. Moreira, W. Pi.", "occurrence_notes":null, "guid":"141272-21888524@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141272", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Algebraic Geometry Seminar - Department of Mathematics", "group_id":"4880", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "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":21888524 } , "143763-21893983": { "datetime_modified":"20260112T153641", "datetime_start":"20260128T160000", "datetime_end":"20260128T170000", "has_end_time":1, "date_start":"2026-01-28", "date_end":"2026-01-28", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Convergence Analysis of Discrete Sampling in Continuous-Time Reinforcement Learning and High-Dimensional Numerical Integration", "occurrence_title":"", "combined_title":"Convergence Analysis of Discrete Sampling in Continuous-Time Reinforcement Learning and High-Dimensional Numerical Integration: Du Ouyang, Tsinghua", "event_subtitle":"Du Ouyang, Tsinghua", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Stochastic policies (also known as relaxed controls) are widely used in continuous-time Reinforcement Learning (RL) algorithms. However, a critical disconnect remains between theory and practice. The theoretical aggregated dynamics, driven by averaged coefficients, provide a convenient basis for deriving RL algorithms but cannot be directly implemented. Physical execution requires the agent to sample concrete actions from the policy. Since continuously sampling independent actions poses significant mathematical and computational challenges, practical implementation must rely on discrete sampling. Yet, for general diffusion processes, the accuracy of such discretely sampled dynamics has lacked rigorous theoretical justification.\r\n\r\nIn this talk, I will bridge this gap by introducing and rigorously analyzing a policy execution framework that samples actions from a stochastic policy at discrete time points and implements them as piecewise constant controls. We prove that as the sampling mesh size tends to zero, the controlled state process converges weakly to the dynamics with coefficients aggregated according to the stochastic policy. We explicitly quantify the convergence rate based on the regularity of the coefficients and establish an optimal first-order convergence rate for sufficiently regular coefficients. Additionally, we prove a 1\/2-order weak convergence rate that holds uniformly over the sampling noise with high probability, and establish a 1\/2-order pathwise convergence for each realization of the system noise in the absence of volatility control. Building on these results, we analyze the bias and variance of various policy evaluation and policy gradient estimators based on discrete-time observations. Our results provide theoretical justification for the exploratory stochastic control framework in [H. Wang, T. Zariphopoulou, and X.Y. Zhou, J. Mach. Learn. Res., 21 (2020), pp. 1-34].\r\n\r\nFinally, I will also briefly discuss my research on Quasi-Monte Carlo sampling methods for efficient computation in high-dimensional numerical integration.", "occurrence_notes":null, "guid":"143763-21893983@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143763", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Virtual", "has_livestream":1, "livestream_type":"other", "livetream_require_login":0, "livestream_id":"", "livestream_link":"", "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Financial\/Actuarial Mathematics Seminar - Department of Mathematics", "group_id":"4890", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "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":21893983 } , "143980-21894368": { "datetime_modified":"20260115T181513", "datetime_start":"20260128T160000", "datetime_end":"20260128T180000", "has_end_time":1, "date_start":"2026-01-28", "date_end":"2026-01-28", "time_start":"16:00:00", "time_end":"18:00:00", "time_zone":"America\/Detroit", "event_title":"Make Your Own Flyer Workshops", "occurrence_title":"", "combined_title":"Make Your Own Flyer Workshops", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"*No prior experience required, all supplies will be provided\"\r\n\r\nAre you curious about DIY art and culture? These art-making drop in workshops offer a hands-on way to engage with the ephemera of underground and independent music scenes featured in the Flyover Country exhibition. You will have the opportunity to make the poster for a dream show with a lineup of your favorite bands, draw a protest flyer, put together a collage art piece, or even design a flyer for a real upcoming event you're planning.\r\nA button maker will be available for anyone who wants to turn a design into a punk-inspired button pin, all participants will receive a free handout to take home with them.\r\n\r\nJanuary 28th workshop participants are also welcome to tape their finished flyers to a shared display wall in the gallery if they choose, becoming part of the exhibit while it\u2019s on view. \r\n\r\nFree coffee, tea, and treats will be provided at both workshops on a first-come, first-served basis.", "occurrence_notes":null, "guid":"143980-21894368@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143980", "building_id":"1000227", "building_name":"Shapiro Library", "campus_maps_id":"139", "room":"Shapiro Gallery, Third Floor, Room 3160", "location_name":"Shapiro Library", "has_livestream":0, "cost":"", "tags":["Art","Arts For All","Culture","In Person","Workshop"], "website":"https:\/\/events.umich.edu\/event\/143875", "sponsors":[ { "group_name":"Arts Initiative", "group_id":"4583", "website":"" }, { "group_name":"University Library", "group_id":"1186", "website":"https:\/\/www.facebook.com\/UMichLibrary\/" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_143980_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_143980_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/01\/event_143980_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/01\/event_143980_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/01\/event_143980_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/01\/event_143980_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_143980_original-1.png" }, "occurrence_count":2, "first_occurrence":21894368 } , "144430-21895346": { "datetime_modified":"20260124T210402", "datetime_start":"20260128T160000", "datetime_end":"20260128T170000", "has_end_time":1, "date_start":"2026-01-28", "date_end":"2026-01-28", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Probability\/Analysis Circle: Change of Variables - From Symmetric Matrices to Eigenvalues", "occurrence_title":"", "combined_title":"Probability\/Analysis Circle: Change of Variables - From Symmetric Matrices to Eigenvalues: Jinho Baik", "event_subtitle":"Jinho Baik", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"This is the second meeting of the Probability\/Analysis Circle, a new event for juniors, seniors, and master\u2019s students interested in probability and analysis. Eigenvalues of a symmetric matrix are complicated functions of the matrix\u2019s entries. If we view the mapping from the entries of a symmetric matrix to its eigenvalues and eigenvectors as a change of variables, what is the Jacobian? We will compute it for the 2x2 case and discuss the general nxn case. Then, we\u2019ll use this formula to explore the distribution of random eigenvalues for certain random symmetric matrices. Students are expected to know multivariable calculus.", "occurrence_notes":null, "guid":"144430-21895346@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144430", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Probability and Analysis Seminar - Department of Mathematics", "group_id":"5203", "website":"https:\/\/sites.google.com\/view\/probsemumich\/future-talks" }, { "group_name":"Department of Mathematics", "group_id":"3791", "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":21895346 } }