Quantum electrodynamic corrections to thegfactor of heliumPstates

Quantum electrodynamic corrections to the hyperfine structure of excited S states

State-dependent quantum electrodynamic corrections are evaluated for the hyperfine splitting of nS states for arbitrary principal quantum number n. The calculations comprise both the self-energy and the vacuumpolarization correction of order α (Z α) EF and the recoil correction of order (Z α) (m/M)EF . Higherorder corrections are summarized and partly reevaluated as well. Accurate predictions f...

Quantum Corrections to Noncommutative Solitons

Noncommutative solitons are easier to find in a noncommutative field theory. Similarly, the one-loop quantum corrections to the mass of a noncommutative soliton are easier to compute, in a real scalar theory in 2 + 1 dimensions. We carry out this computation in this paper. We also discuss the model with a double-well potential, and conjecture that there is a partial symmetry restoration in a va...

Quantum Corrections to Deep Bags ∗

Nontopological solitons, or “bags,” can arise when fermions acquire their mass through a Yukawa coupling to some scalar field. Bags have played an important role in models of baryons, nuclei, and more recently, in the idea that a Higgs condensate may form around a very heavy top quark. It has been claimed that deep bags, which correspond to tightly-bound states of fermions, will form when the Y...

Quantum Corrections to Nucleation Rates

In this paper we show how to compute in a consistent way nucleation rates in field theory at finite temperatures, with metastable vacuum. Using the semiclassical approach in field theory at finite temperature we show that the prefactor term can be calculated explicitly (in the thin-wall approximation) and that the same provides exponential finite temperature quantum corrections to nucleation ra...

Quantum Electrodynamic Theory: Its Relation to Precision Low Energy Experiments*