{ "130752-21866812": { "datetime_modified":"20250205T084223", "datetime_start":"20250221T150000", "datetime_end":"20250221T160000", "has_end_time":1, "date_start":"2025-02-21", "date_end":"2025-02-21", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | The Gauge Theory Bootstrap: Computing Pion amplitudes and low energy parameters from QCD.", "occurrence_title":"", "combined_title":"HET Seminar | The Gauge Theory Bootstrap: Computing Pion amplitudes and low energy parameters from QCD.: Martin Kruczenski (Purdue)", "event_subtitle":"Martin Kruczenski (Purdue)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Under the assumption of confinement and chiral symmetry breaking the low energy description of QCD is in terms of an effective theory of pions whose properties (couplings) should be derived from the high energy Lagrangian (QCD). In this talk I will describe recent work in collaboration with Yifei He where we propose a bootstrap method to compute pion scattering phase shifts and low energy effective action coefficients. The method looks for the most general S-matrix that matches at low energy the tree level amplitudes of the non-linear sigma model and at high energy, QCD sum rules and form factors. This is a theoretical\/numerical calculation that uses as only data the pion mass, pion decay constant fpi and the QCD parameters Nc=3, Nf=2, mq and alpha_s. The results are in reasonable agreement with experiment. In particular, we find the rho(770), f2(1270) and rho(1450) resonances. The interplay between the UV gauge theory and low energy pion physics is an example of a general situation where we know the microscopic theory as well as the effective theory of long wavelength fluctuations but we want to solve the strongly coupled dynamics at intermediate energies. The bootstrap builds a bridge between the low and high energy by determining the consistent S-matrix that matches both and provides, in this case, a new direction to understand the strongly coupled physics of gauge theories.", "occurrence_notes":null, "guid":"130752-21866812@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/130752", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3481", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["High Energy Theory Seminar","Physics"], "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 Seminars", "group_id":"3806", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics High Energy Theory Seminars", "group_id":"4313", "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":21866812 } , "132697-21871614": { "datetime_modified":"20250303T063217", "datetime_start":"20250221T150000", "datetime_end":"20250221T153000", "has_end_time":1, "date_start":"2025-02-21", "date_end":"2025-02-21", "time_start":"15:00:00", "time_end":"15:30:00", "time_zone":"America\/Detroit", "event_title":"My First Year Teaching in Albemarle County Public Schools", "occurrence_title":"", "combined_title":"My First Year Teaching in Albemarle County Public Schools", "event_subtitle":"", "event_type":"Careers \/ Jobs", "event_type_id":"2", "description":"In this second edition, we will check back in with one of our first year teachers. Winter break recharge, winter weather, back forsecond semester.We hope to see you there.", "occurrence_notes":null, "guid":"132697-21871614@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/132697", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"", "has_livestream":0, "cost":"", "tags":[], "website":"", "sponsors":[ { "group_name":"University Career Center UCC", "group_id":"1140", "website":"http:\/\/careercenter.umich.edu" } ], "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":21871614 } , "132812-21871908": { "datetime_modified":"20250217T004231", "datetime_start":"20250221T150000", "datetime_end":"20250221T160000", "has_end_time":1, "date_start":"2025-02-21", "date_end":"2025-02-21", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Student Algebraic Geometry: The Mckay Correspondence", "occurrence_title":"", "combined_title":"Student Algebraic Geometry: The Mckay Correspondence: Ritwick Bhargava", "event_subtitle":"Ritwick Bhargava", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The Mckay Correspondence is a bijection between finite subgroups of SL(2,C), rational double points on surfaces, and the ADE Dynkin diagrams. This links various \"exceptional objects\" appearing in classifications, for example, associating the regular icosahedron to the E8 diagram. I will outline an explanation of the correspondence by relating the geometry of the minimal resolution of the quotient C^2\/G to the representation theory of the finite subgroup G of SL(2,C). I will also mention generalizations to higher dimensions and the setting of derived categories.", "occurrence_notes":null, "guid":"132812-21871908@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/132812", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"2866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Student Algebraic Geometry Seminar - Department of Mathematics", "group_id":"4904", "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":21871908 } }