{ "149985-21907765": { "datetime_modified":"20260824T163759", "datetime_start":"20260911T150000", "datetime_end":"20260911T160000", "has_end_time":1, "date_start":"2026-09-11", "date_end":"2026-09-11", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | Phasing out Dark Matter Isocurvature with Thermal Misalignment", "occurrence_title":"", "combined_title":"HET Seminar | Phasing out Dark Matter Isocurvature with Thermal Misalignment: Mudit Rai (UM)", "event_subtitle":"Mudit Rai (UM)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Thermal misalignment provides an alternative to the standard misalignment mechanism for the cosmological production of scalar dark matter. In this framework, feeble couplings to particles in the thermal bath generate a finite-temperature potential that drives the scalar towards large field values early in the radiation era, dynamically inducing the misalignment before the onset of scalar oscillations. As a result, the relic abundance is controlled primarily by particle masses and couplings rather than the initial field value. As a light spectator field, the scalar acquires inflationary fluctuations that are uncorrelated with the adiabatic curvature mode, generically sourcing isocurvature perturbations. We show that, unlike standard misalignment, where light scalars are strongly constrained by cosmic microwave background bounds on dark matter isocurvature for high-scale inflation, thermal misalignment can naturally suppress the isocurvature signal. This occurs through a novel late-time phase offset between the background zero mode and the superhorizon perturbations, which reduces the final dark matter density contrast. Thermal misalignment therefore provides a new and generic route to isocurvature-safe scalar dark matter.", "occurrence_notes":null, "guid":"149985-21907765@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149985", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["lecture","Physics","Science","Seminar","High Energy Theory Seminar"], "website":"", "sponsors":[ { "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":21907765 } , "150863-21910327": { "datetime_modified":"20260825T092903", "datetime_start":"20260925T150000", "datetime_end":"20260925T160000", "has_end_time":1, "date_start":"2026-09-25", "date_end":"2026-09-25", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar |", "occurrence_title":"", "combined_title":"HET Seminar |: Raymond Co (Indiana)", "event_subtitle":"Raymond Co (Indiana)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"tbd", "occurrence_notes":null, "guid":"150863-21910327@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150863", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Talk","Science","Physics","Lecture","High Energy Theory Seminar"], "website":"", "sponsors":[ { "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":21910327 } , "149986-21907766": { "datetime_modified":"20260807T095615", "datetime_start":"20261016T150000", "datetime_end":"20261016T160000", "has_end_time":1, "date_start":"2026-10-16", "date_end":"2026-10-16", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | Cosmological Seed Magnetic Field from Inflation", "occurrence_title":"", "combined_title":"HET Seminar | Cosmological Seed Magnetic Field from Inflation: Bharat Ratra (Kansas University)", "event_subtitle":"Bharat Ratra (Kansas University)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"A cosmological magnetic field of nG strength on Mpc length scales could be the seed magnetic field needed to explain observed few microG large-scale galactic magnetic fields. I first briefly review the observational and theoretical motivations for such a seed field, two galactic magnetic field amplification models, and some non-inflationary seed field generation scenarios. I then discuss an inflation magnetic field generation model. I conclude by mentioning possible extensions of this model as well as potentially observable consequences.", "occurrence_notes":null, "guid":"149986-21907766@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149986", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Seminar","Science","Physics","Natural Sciences","lecture","High Energy Theory Seminar"], "website":"", "sponsors":[ { "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":21907766 } , "150864-21910328": { "datetime_modified":"20260825T093241", "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 |", "occurrence_title":"", "combined_title":"HET Seminar |: Claudio Manzari (IAS)", "event_subtitle":"Claudio Manzari (IAS)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"tbd", "occurrence_notes":null, "guid":"150864-21910328@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150864", "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","Physics","Science","Seminar"], "website":"", "sponsors":[ { "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":21910328 } }