I What is the connection between the Lamb Shift and the g factor?

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Trying to find a connection between these two (Lamb Shift and G factor aka anomalous magnetic moment)
German Wikipedia mentions that the g factor is one of the causes of the Lamb Shift. It does not say why and I am trying to find a connection between these two things. Any ideas?
 
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The anomalous ##g## factor (devisions from 2 for elementary Dirac particles like the electron or muon) are due to the radiative corrections of the ##e\bar{e}\gamma## vertex function, which are also contributing to the Lamb shift of the hydrogen-atom levels.
 
vanhees71 said:
The anomalous ##g## factor (devisions from 2 for elementary Dirac particles like the electron or muon) are due to the radiative corrections of the ##e\bar{e}\gamma## vertex function, which are also contributing to the Lamb shift of the hydrogen-atom levels.
Ah I see. And how are they contributing? What would change if they would not be there?
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!

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