Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 23: Correlated Electrons – Poster I

TT 23.32: Poster

Monday, March 9, 2026, 18:00–20:00, P1

High precision physics in Anderson impurity models, from neutrino mass to axion production in the sun. — •Vera Butz and Maurits W Haverkort — Universität Heidelberg, Institut für theoretische Physik, Philosophenweg 19, 69120 Heidelberg

High-precision comparisons between experimental measurements and numerical simulations not only test the accuracy of computational methods but also offer deeper insights into fundamental physics. In this work, we investigate how charged ions with multiple electrons interact with continuum states, such as photons, free electrons, or as-yet-unobserved particles. This is achieved by using a generalized Anderson impurity model, in which the interactions can be described via the self-energy or hybridization function. The real part of the self-energy induces energy shifts in atomic multiplets, such as the Lamb shift, while the imaginary part results in finite lifetimes for excited states, leading to phenomena like fluorescence or Auger-Meitner decay. Using this method of high-precision calculations of decay rates, on highly charged heavy ions in laboratory or astrophysical settings, allows us to probe the Standard Model. Be that by measuring unknowns, like the neutrino mass [1] or discovering new potential particles like dark matter candidates [2].
[1] Nat. Phys. 20, 921 (2024)
[2] JCAP 09 (2021) 006

Keywords: Precision; Many-body quantum systems; Auger-Meitner decay; Beyond standard model physics; Axions