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        "date_start":"2023-08-03",
        "date_end":"2023-08-03",
        "time_start":"14:30:00",
        "time_end":"15:15:00",
        "time_zone":"America\/Detroit",
        "event_title":"We Are Stars",
        "occurrence_title":"",
        "combined_title":"We Are Stars: Planetarium & Dome Theater",
        "event_subtitle":"Planetarium & Dome Theater",
        "event_type":"Presentation",
        "event_type_id":"16",
        "description":"What are we made of? Where did it all come from? Explore the secrets of our cosmic chemistry and our explosive origins. Connect life on Earth to the evolution of the Universe by following the formation of hydrogen atoms to the synthesis of carbon, and the molecules for life.\r\n\r\nThe state-of-the-art Planetarium & Dome Theater at the U-M Museum of Natural History transports visitors beyond distant stars and back in time from the comfort of reclining seats. Tickets $8. Tickets are available on the day of the show at the Museum Store.",
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        "building_name":"Museum of Natural History",
        "campus_maps_id":"646",
        "room":"",
        "location_name":"Museum of Natural History",
        "has_livestream":0,
        "cost":"",
        "tags":["Astronomy","Museum","Natural Sciences","Science"],
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                "group_name":"Planetarium & Dome Theater at the Museum of Natural History",
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        "datetime_start":"20230803T160000",
        "datetime_end":"20230803T170000",
        "has_end_time":1,
        "date_start":"2023-08-03",
        "date_end":"2023-08-03",
        "time_start":"16:00:00",
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        "time_zone":"America\/Detroit",
        "event_title":"Bessel operators as toy models of  renormalization group",
        "occurrence_title":"",
        "combined_title":"Bessel operators as toy models of  renormalization group: Jan Derezinski (University of Warsaw)",
        "event_subtitle":"Jan Derezinski (University of Warsaw)",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"In Quantum Field Theory one usually needs to perform the following steps:\r\n1. Cut off the formal Hamiltonian with a momentum cutoff.\r\n2.  Add an appropriate counterterm times a running coupling constant. \r\n3. Determine the differential equation for the coupling constant.\r\n4. Go with the cutoff to infinity.\r\nI will show that the same steps are needed in the much simpler context of Bessel Hamiltonians, that is,  Schr\\\"odinger operators with the inverse square potential, if you use the momentum representation. The action of scaling on  self-adjoint realizations of Bessel operators serves as a nice illustration of  a \"renormalization group flow\".",
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                "guid":"109157-21821140@events.umich.edu",
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        "building_name":"East Hall",
        "campus_maps_id":"53",
        "room":"4088",
        "location_name":"East Hall",
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        "tags":["Mathematics","Quantum Field Theory"],
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        "sponsors":[
             {
                "group_name":"Department of Mathematics",
                "group_id":"3791",
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