[en] The Casimir stress on a perfectly conducting cylindrical shell, due to quantum field fluctuations (zero-point energy) in both the interior and exterior regions, is computed using a Green's dyadic formulation for the field strengths. To obtain a finite answer, a frequency cutoff must be inserted, but the result is independent of that cutoff. The Casimir stress is found to be attractive, the Casimir energy per unit length for a cylinder of radius a being: epsilon = -0.014/a²

No abstract available

No abstract available

No abstract available

[en] The decay of psi' → psi + ππ is described by a chiral epsilon model. The general features of the observed dipion spectrum are well reproduced. Comparison with the hadronic decay rho' → rho + ππ indicates that the psi'psi epsilon coupling is relatively suppressed by a factor approximately 10^-2

[en] The general method to calculate Casimir forces using Source Theory is reviewed. Included are such issues as point splitting, high frequency cut-offs and the inclusion of temperature. The details of calculations for planar, spherical and cylindrical geometries are presented. Finally, assuming spin zero photons, the Casimir force between perfectly conducting spheres is calculated. The large distance behavior is found to be proportional to the inverse distance to the fourth power, unlike the spin one behavior of the eighth power. (author)

[en] We explicitly calculate the fourth-order particle-particle scattering amplitude in scalar electrodynamics using the techniques of source theory. We find that there is an ambiguity in determining the space-time extrapolation of the resulting spectral forms which necessitates the introduction of a local phi⁴ coupling. There is then a new experimental number necessary in addition to the electric charge. Some consequences of the new interaction are considered which imply that an arbitrary coupling constant will not lead to further ambiguities. Therefore, scalar electrodynamics is generally a two-parameter theory. There is one exception in that a consistent one-parameter theory is possible for which the additional local coupling is zero

[en] The differential cross section is calculated through order α³ for transversely polarized incident electrons using the helicity amplitudes presented in a previous paper. The high-energy limit is compared with a recent calculation of Gastmans and Van Ham and certain errors are pointed out

[en] In a pseudoscalar-coupling theory, we calculate the fourth-order fermion--pseudoscalar scattering amplitude by using source--theory methods. The space-time extrapolation of one of the double-spectral forms is ambiguous. However, when the ambiguity is shifted to the accompanying single-spectral forms, it is found that their extrapolation is unambiguous; a determinate result for the scattering amplitude results

[en] Schwinger's interpretation of the narrow resonances coupling to the electric current suggests that there are charged vector particles that decay weakly, having mass of perhaps 3.4 GeV. These may have already been seen in neutrino scattering experiments. (Auth.)