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Full-Text Articles in Physics
Renormalization And Radiative-Corrections At Finite Temperature, Jf Donoghue, Br Holstein
Renormalization And Radiative-Corrections At Finite Temperature, Jf Donoghue, Br Holstein
Barry R Holstein
We discuss the renormalization prescription for fermions at finite temperature and describe the procedure for calculating radiative corrections. Novel features arise, such as a lack of explicit Lorentz invariance, 1k2 singularities, and the absorption of soft photons from the background heat bath. The methods are illustrated by explicit calculation of the electron renormalization and the radiative corrections to H-->e+e- (with H being spin zero) in finite-temperature QED.
Bound-States, Virtual States, And Non-Exponential Decay Via Path-Integrals, Br Holstein
Bound-States, Virtual States, And Non-Exponential Decay Via Path-Integrals, Br Holstein
Barry R Holstein
Using path integral techniques we demonstrate how three quantum-mechanical phenomena-alpha decay, nonexponential decay, and resonant scattering-can be treated. This procedure is an algebraic one yet reproduces the usual results obtained via solution of the Schrödinger equation via WKB methods.