{ "148214-21903333": { "datetime_modified":"20260511T121921", "datetime_start":"20260522T110000", "datetime_end":"20260522T120000", "has_end_time":1, "date_start":"2026-05-22", "date_end":"2026-05-22", "time_start":"11:00:00", "time_end":"12:00:00", "time_zone":"America\/Detroit", "event_title":"Cosmo-Astro Seminar | Supernova Cousins: Leveraging Galaxy-group Information to Improve Type Ia Supernova Cosmology", "occurrence_title":"", "combined_title":"Cosmo-Astro Seminar | Supernova Cousins: Leveraging Galaxy-group Information to Improve Type Ia Supernova Cosmology: Allison Blum (University of Hawaii at Manoa)", "event_subtitle":"Allison Blum (University of Hawaii at Manoa)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Type Ia supernovae (SNe Ia) are a cornerstone of precision cosmology, but at low redshift their accuracy is increasingly limited by systematic uncertainties. This has gained urgency with recent results from the Dark Energy Spectroscopic Instrument suggesting possible cracks in the standard cosmological model, including evolving dark energy. Among the dominant systematics are peculiar velocities, which are tied to large-scale structure and environmental effects, which are linked to galaxy evolution. Peculiar velocities have been studied through models of the velocity field and galaxy groups and clusters, while environmental effects have been probed using rare \"supernova siblings,\" multiple SNe Ia within the same host galaxy. These approaches, however, focus on either the motions of galaxies or the environment that these SNe go off in, but not both at the same time. In this talk, I introduce \"supernova cousins\": SNe Ia in different galaxies within the same group or cluster, thereby combining both effects. Using a sample of 1,086 low-z SNe Ia from ATLAS, we construct a sample of 93 SN Cousins. With this sample, I compare distance scatter across environments and test the limits of how well we can use them to improve SN cosmology.", "occurrence_notes":null, "guid":"148214-21903333@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148214", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3246", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["Faculty","Free","Physics"], "website":"https:\/\/lsa.umich.edu\/physics", "sponsors":[ { "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":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21903333 } , "148264-21903462": { "datetime_modified":"20260513T124418", "datetime_start":"20260522T110000", "datetime_end":"20260522T120000", "has_end_time":1, "date_start":"2026-05-22", "date_end":"2026-05-22", "time_start":"11:00:00", "time_end":"12:00:00", "time_zone":"America\/Detroit", "event_title":"Cosmo-Astro Seminar | Supernova Cousins: Leveraging Galaxy-group Information to Improve Type Ia Supernova Cosmology", "occurrence_title":"", "combined_title":"Cosmo-Astro Seminar | Supernova Cousins: Leveraging Galaxy-group Information to Improve Type Ia Supernova Cosmology: Allison Blum (University of Hawaii at Manoa)", "event_subtitle":"Allison Blum (University of Hawaii at Manoa)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Type Ia supernovae (SNe Ia) are a cornerstone of precision cosmology, but at low redshift their accuracy is increasingly limited by systematic uncertainties. This has gained urgency with recent results from the Dark Energy Spectroscopic Instrument suggesting possible cracks in the standard cosmological model, including evolving dark energy. Among the dominant systematics are peculiar velocities which are tied to large-scale structure and environmental effects which are linked to galaxy evolution. Peculiar velocities have been studied through models of the velocity field and galaxy groups and clusters, while environmental effects have been probed using rare \u201csupernova siblings,\u201d multiple SNe Ia within the same host galaxy. These approaches, however, focus on either the motions of galaxies or the environment that these SNe go off in, but not both at the same time. In this talk, I introduce \u201csupernova cousins\u201d: SNe Ia in different galaxies within the same group or cluster, thereby combining both effects. Using a sample of 1,086 low-z SNe Ia from ATLAS, we construct a sample of 93 SN Cousins. With this sample, I compare distance scatter across environments and test the limits of how well we can use them to improve SN cosmology.", "occurrence_notes":"Leinweber Institute for Theoretical Physics", "guid":"148264-21903462@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148264", "building_id":"1000208", "building_name":"Randall Laboratory", "campus_maps_id":"133", "room":"3247 Neal Lab", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["Astronomy","Physics"], "website":"https:\/\/lsa.umich.edu\/litp\/news-events\/all-events\/seminars\/um-cosmology-group-seminars.html", "sponsors":[ { "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":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21903462 } , "148234-21903426": { "datetime_modified":"20260512T112510", "datetime_start":"20270331T160000", "datetime_end":"20270331T170000", "has_end_time":1, "date_start":"2027-03-31", "date_end":"2027-03-31", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"2027 Helmut W. Baer Lecture", "occurrence_title":"", "combined_title":"2027 Helmut W. Baer Lecture: Abhay Deshpande, Associate Lab Director for Nuclear and Particle Physics & EIC Science Director (Brookhaven National Laboratory and Stony Brook University)", "event_subtitle":"Abhay Deshpande, Associate Lab Director for Nuclear and Particle Physics & EIC Science Director (Brookhaven National Laboratory and Stony Brook University)", "event_type":"Presentation", "event_type_id":"16", "description":"Prof. Abhay Deshpande works in experimental nuclear and high-energy physics. His current research includes various exploratory and precision studies in QCD using polarized proton-proton, proton-nucleus, and nucleus-nucleus beams of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory on Long Island, and high-intensity polarized electron beams of the recently upgraded Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson National Laboratory, in Newport News, Virginia. He has been deeply involved in the development of the science and promotion of the future Electron Ion Collider.", "occurrence_notes":null, "guid":"148234-21903426@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148234", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Engineering","Faculty","Free","Graduate And Professional Students","Natural Sciences","Nuclear","Smoke-free","Undergrad Physics Events","Undergraduate Students"], "website":"https:\/\/lsa.umich.edu\/physics\/news-events\/special-lectures\/the-helmut-w--baer-lecture.html", "sponsors":[ { "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":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21903426 } }