Bath-Induced Self-Energy: Cooperative Lamb-Shift and Dipole–Dipole Interactions

2021 ◽  
pp. 91-118
Keyword(s):  
Lamb Shift ◽  
Self Energy ◽  
Dipole Interactions

scholarly journals Quantum electrodynamics with self-conjugated equations with spinor wave functions for fermion fields

2021 ◽  
pp. 2150086
Author(s):  
V. P. Neznamov ◽  
V. E. Shemarulin
Keyword(s):  
Cross Sections ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Quantum Electrodynamics ◽  
Lamb Shift ◽  
Wave Functions ◽  
Self Energy ◽  
Fermion Fields ◽  
Spinor Wave

Quantum electrodynamics (QED) with self-conjugated equations with spinor wave functions for fermion fields is considered. In the low order of the perturbation theory, matrix elements of some of QED physical processes are calculated. The final results coincide with cross-sections calculated in the standard QED. The self-energy of an electron and amplitudes of processes associated with determination of the anomalous magnetic moment of an electron and Lamb shift are calculated. These results agree with the results in the standard QED. Distinctive feature of the developed theory is the fact that only states with positive energies are present in the intermediate virtual states in the calculations of the electron self-energy, anomalous magnetic moment of an electron and Lamb shift. Besides, in equations, masses of particles and antiparticles have the opposite signs.

scholarly journals Relative Entropy as a Measure of Difference between Hermitian and Non-Hermitian Systems

Entropy ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 809
Author(s):  
Kabgyun Jeong ◽  
Kyu-Won Park ◽  
Jaewan Kim
Keyword(s):  
Relative Entropy ◽  
Lamb Shift ◽  
Strong Interactions ◽  
Average Value ◽  
Optical Microcavities ◽  
Self Energy ◽  
The Difference

We employ the relative entropy as a measure to quantify the difference of eigenmodes between Hermitian and non-Hermitian systems in elliptic optical microcavities. We have found that the average value of the relative entropy in the range of the collective Lamb shift is large, while that in the range of self-energy is small. Furthermore, the weak and strong interactions in the non-Hermitian system exhibit rather different behaviors in terms of the relative entropy, and thus it displays an obvious exchange of eigenmodes in the elliptic microcavity.

scholarly journals Some recent advances in bound-state quantum electrodynamics

2005 ◽  
Vol 83 (4) ◽  
pp. 375-386 ◽  
Author(s):  
U D Jentschura ◽  
J Evers
Keyword(s):  
Effective Field Theories ◽  
Quantum Electrodynamics ◽  
Lamb Shift ◽  
Recent Progress ◽  
Bound State ◽  
Effective Field ◽  
Field Theories ◽  
Nonrelativistic Quantum ◽  
Self Energy ◽  
Bound Electron

We discuss recent progress in various problems related to bound-state quantum electrodynamics: the bound-electron g factor, two-loop self-energy corrections, and the laser-dressed Lamb shift. The progress relies on various advances in the bound-state formalism, including ideas inspired by effective field theories such as nonrelativistic quantum electrodynamics. Radiative corrections in dynamical processes represent a promising field for further investigations. PACS Nos.: 31.15.–p, 12.20.Ds

Second-order self-energy–vacuum-polarization contributions to the Lamb shift in highly charged few-electron ions

1996 ◽  
Vol 54 (4) ◽  
pp. 2805-2813 ◽  
Author(s):  
Hans Persson ◽  
Ingvar Lindgren ◽  
Leonti N. Labzowsky ◽  
Günter Plunien ◽  
Thomas Beier ◽  
...  
Keyword(s):  
Lamb Shift ◽  
Vacuum Polarization ◽  
Second Order ◽  
Self Energy

scholarly journals Two-loop QED corrections in few-electron ions

2007 ◽  
Vol 85 (5) ◽  
pp. 521-529 ◽  
Author(s):  
V A Yerokhin ◽  
P Indelicato ◽  
V M Shabaev
Keyword(s):  
Excited States ◽  
Lamb Shift ◽  
Nuclear Charge ◽  
Detailed Comparison ◽  
Theoretical Uncertainty ◽  
Strength Parameter ◽  
Transition Energies ◽  
Energy Correction ◽  
Self Energy ◽  
Order Calculation

Results of a calculation valid to all orders in the nuclear-strength parameter Zα are presented for the two-loop Lamb shift, notably for the two-loop self-energy correction, for the ground and first excited states of ions with the nuclear charge numbers Z = 60–100. A detailed comparison of the all-order calculation with earlier investigations based on an expansion in the parameter Zα is given. The calculation removes the largest theoretical uncertainty for the 2pj–2s transition energies in heavy Li-like ions and is important for interpretation of experimental data.PACS Nos.: 31.30.Jv, 31.30.–i, 31.10.+z

scholarly journals Contribution of the screened self-energy to the Lamb shift of quasidegenerate states

2001 ◽  
Vol 63 (4) ◽  
Author(s):  
Éric-Olivier Le Bigot ◽  
Paul Indelicato ◽  
Vladimir M. Shabaev
Keyword(s):  
Lamb Shift ◽  
Self Energy
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