Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.53: Poster

Wednesday, March 19, 2025, 15:00–18:00, P4

Using the Anderson Impurity Model to Look for Particles Beyond the Standard Model — •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 [1] not only test the accuracy of computational methods but also offer deeper insights into fundamental physics. In this work, we investigate the interaction of charged ions with multiple electrons and continuum states, presenting a generalized Anderson impurity model. The continuum states considered include photons, free electrons, or as-yet-unobserved particles, such as axions. These interactions can be described through the self-energy or hybridization function [2]. 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. When applied to highly charged heavy ions, whether in laboratory settings or astrophysical environments such as the Sun, these enhanced electron-photon (or other particle) interactions provide a platform to probe the Standard Model. Additionally, they may reveal evidence of new physics, including the potential detection of axions, a leading dark matter candidate that could also address the strong CP problem.

[1] Nat. Phys. 20, 921 (2024).

[2] arXiv:2307.13812v1.

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