International Conference on Precision Physics of Simple Atomic Systems

Session

Session 4

18 May 2026, 16:10

Festsaal (ÖAW)

63. Completed two-loop self-energy calculations for improving the bound-electron g-factor theory

Bastian Sikora

18/05/2026, 16:10

Talk

The bound-electron $𝑔$-factor in heavy highly charged ions can be measured with high precision. However, due to uncalculated two-loop QED binding corrections, the theoretical uncertainty in this regime is orders of magnitude larger than the experimental uncertainty. This was also highlighted in a recent collaborative project, where the comparison of bound-electron $𝑔$-factors in hydrogenlike...

17. Relativistic Fock-space coupled cluster properties calculations of highly charged ions for probing atomic clocks and fundamental symmetries

Brajesh Kumar Mani (Indian Institute of Technology Delhi)

18/05/2026, 16:40

Talk

Atomic systems offer a plethora of fundamental and functional properties and therefore are of importance to several key implications. Some examples where atoms and ions can serve as important probes include, atomic clocks [1], parity and time-reversal violations [2, 3], and the search for the variations in the fundamental constants [4]. Atomic systems, however, form a many-body complex system...

87. Searching for new bosons with precision spectroscopy of highly charged ions: $g$-factor and hyperfine structure tests

Dr Zoltan Harman (Max Planck Institute for Nuclear Physics)

18/05/2026, 17:00

Talk

Precision measurements in simple atomic systems offer powerful probes for physics beyond the Standard Model. One promising approach is based on high-precision measurements of the bound-electron g factor in hydrogen-like ions. The exchange of a hypothetical scalar boson would produce a small additional contribution to the ground-state g factor. By calculating this effect and comparing it...

69. Measurements of the bound-electron $g$ factor in highly charged ions: testing fundamental physics

Anton Gramberg (Max Planck Institute for Nuclear Physics (DE))

18/05/2026, 17:20

Talk

The $g$ factor of the bound electron in few-electron highly charged ions is a highly sensitive probe for new physics and its measurement allows to test the predictions of quantum electrodynamics (QED) in the extremely strong electric field of the nucleus. Studying these simple atomic systems allows to examine bound-state QED and even nuclear effects to high accuracy. ALPHATRAP [1] is a...