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    "153121-21915118":
    {
        "datetime_modified":"20261005T161042",
        "datetime_start":"20261012T150000",
        "datetime_end":"20261012T160000",
        "has_end_time":1,
        "date_start":"2026-10-12",
        "date_end":"2026-10-12",
        "time_start":"15:00:00",
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        "time_zone":"America\/Detroit",
        "event_title":"CA Seminar: The Second Vanishing Theorem in Ramified Mixed Characteristic",
        "occurrence_title":"",
        "combined_title":"CA Seminar: The Second Vanishing Theorem in Ramified Mixed Characteristic: Alex Scheffelin - Columbia University",
        "event_subtitle":"Alex Scheffelin - Columbia University",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Abstract: To a triple of a ring $R$, an $R$-module $M$, and an ideal $I$ we can associate the local cohomology modules $H^n_I(M)$. One classical problem dating back to a question of Grothendieck is to identify when these vanish for all $n > i$ and all modules $M$, the smallest such $i$ we denote the cohomological dimension of $R$ with respect to $I$. Grothendieck showed that this is bounded by $d = \\dim R$, while a very simple condition on $\\widehat{R}$ and $I\\widehat{R}$ controls the vanishing at $d$. A more subtle topological condition controls the vanishing at $d-1$ for regular local rings as posed by Hartshorne in the late 60s, and was proven in equicharacteristic in the early 70s. After 50 years it was shown to be true in unramified mixed characteristic, and the main result of this talk is the ramified mixed characteristic case.\n\nWe will discuss the history of the problem, as well as our solution in the ramified case. This proof can recover the vanishing in all characteristics, providing a unified proof, and requires only classical techniques making use of formal schemes.",
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                "group_name":"Commutative Algebra Seminar - Department of Mathematics",
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    {
        "datetime_modified":"20260923T131538",
        "datetime_start":"20261012T150000",
        "datetime_end":"20261012T160000",
        "has_end_time":1,
        "date_start":"2026-10-12",
        "date_end":"2026-10-12",
        "time_start":"15:00:00",
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        "time_zone":"America\/Detroit",
        "event_title":"HEP-Astro Seminar | Does the Higgs boson talk to itself? The latest ATLAS search for di-Higgs production in the HH\u2192bb\u03c4\u03c4 decay channel",
        "occurrence_title":"",
        "combined_title":"HEP-Astro Seminar | Does the Higgs boson talk to itself? The latest ATLAS search for di-Higgs production in the HH\u2192bb\u03c4\u03c4 decay channel: Greg Myers (U-M Physics)",
        "event_subtitle":"Greg Myers (U-M Physics)",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"The Higgs boson, the most recently discovered particle in the Standard Model, is predicted to be an elementary scalar boson which can interact with itself -- an interaction which has yet to be experimentally observed. Measuring the strength of the Higgs self-interaction could tell us if the Higgs is a composite particle, about the shape of the Higgs potential, and further illuminate the details of Electroweak Symmetry-Breaking. By searching for proton--proton collisions at the Large Hadron Collider which produce two Higgs bosons at the same time, we can directly probe the Higgs trilinear self-coupling. In this talk, I will motivate and present results from the latest ATLAS search for di-Higgs production in the HH\u2192bb\u03c4\u03c4 (two b-quarks and two tau leptons) decay channel, the most sensitive search of its kind to date, and the prospects for ATLAS di-Higgs measurements.",
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        "building_name":"West Hall",
        "campus_maps_id":"163",
        "room":"340",
        "location_name":"West Hall",
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        "tags":["Physics","Science"],
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