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        "date_start":"2026-04-17",
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        "event_title":"HET Seminar | Abelian Instantons in Quantum Field Theory and Gravity",
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        "combined_title":"HET Seminar | Abelian Instantons in Quantum Field Theory and Gravity: Isabel Garcia-Garcia",
        "event_subtitle":"Isabel Garcia-Garcia",
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        "description":"I will discuss field configurations of Abelian gauge fields that carry non-zero second Chern number, generated by closed monopole worldlines in four-dimensional Euclidean space. These \"Abelian instantons\" render the electromagnetic vacuum angle physical. In the presence of gravity, magnetic monopoles that are Reissner-Nordstrom black holes naturally realize these field configurations. Including these instantons in the gravitational path integral makes the electromagnetic theta-term a physical parameter of the Standard Model coupled to gravity,",
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