The Einstein Equivalence Principle has as one of its implications that the non-gravitational laws of physics are those of special relativity in any local freely-falling frame. We consider possible tests of this hypothesis for systems whose energies are due to radiative corrections, ie. which arise purely as a consequence of quantum field theoretic loop effects. Specifically, we evaluate the Lam...

The Lamb shift measurement and theory are now both a dynamically developing field and we give a review of the current data. Critical comparison of theory and experiment can be done using a value of the proton charge radius and we pay attention to several results of its determination. The talk is devoted to the Lamb shift in the hydrogen atom. The workshop is for exotic atoms and first of all I ...

The leading order vacuum polarization contribution of very light milli–charged fermions with charge εe and mass μ to the Lamb shift of the hydrogen atom is shown to imply a universal, i.e. μ–independent, upper bound on ε : ε < ∼ 10 for μ < ∼ 1 keV. This is in contrast to expectations based on the commonly used approximation to the Uehling potential.

The Lamb shift in hydrogen spectrum is obtained here in the framework of some weak generalization of the classical Maxwell electrodynamics. It is shown that weakly generalized classical Maxwell electrodynamics can describe the intra-atomic phenomena with the same success as relativistic quantum mechanics can do. Group-theoretical grounds for the description of fermionic states by bosonic system...

We estimate the correction to the Cooper-pair box energy level splitting due to the quantum motion of a coupled micromechanical gate electrode. While the correction due to zero-point motion is very small, it should be possible to observe thermal motion-induced corrections to the photon-assisted tunneling current.

We calculate radiative corrections to the Lamb shift of order α3(Zα)5m and radiative corrections to hyperfine splitting of order α(Zα)EF generated by the diagrams with insertions of radiative photons and electron polarization loops in the graphs with two external photons. We also obtain the radiativerecoil correction to hyperfine splitting in muonium generated by the diagrams with the τ polariz...

The interaction of light with ensembles of many identical resonant atoms becomes increasingly relevant these days as more and more of such systems can be experimentally prepared in a controlled fashion, ranging from atoms in the gas phase, like Bose-Einstein condensates, to solid-state systems, like quantum dots. The existence of many identical resonators in close proximity modifies their prope...

The QCD β-function and the anomalous dimensions for the Coulomb potential and the static potential first differ at three loop order. We evaluate the three loop ultrasoft anomalous dimension for the Coulomb potential and give the complete three loop running. Using this result, we calculate the leading logarithmic Lamb shift for a heavy quark-antiquark bound state, which includes all contribution...

The maximal acceleration corrections to the Lamb shift of muonic hydrogen are calculated by using the relativistic Dirac wave functions. The correction for the 2S − 2P transition is ∼ 0.38 meV and is higher than the accuracy of present QED calculations and of the expected accuracy of experiments in preparation. PACS: 04.90.+e, 12.20.Ds

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