Hamiltonians allowing wave equations

A general criterion of when a Hamiltonian system has a wave equation is set up, and all such Hamiltonian systems (and hence all wave equations) are found. It is shown that the correspondence is one-to-one.     

The conserved currents for the Maxwellian field

We classify the conserved currents for the Maxwellian field. There are four families: (1) the classical currents derived using Noether's theorem from conformal invariance (2) certain Noetherian currents based on translations in field space, (3,4) two more kinds not equivalent to any Noetherian form.     

Analyse der Luft

Ohne Zusammenfassung     

The dynamic differential forms of the Klein-Gordon field and the conformal group

Dynamic differential forms are the natural generalization of conserved currents. We discover the entire class for the real Klein-Gordon field, and find that each dynamic form is equivalent to a Noetherian form, that is, a form based on a canonical symmetry. Going to the complex case, we classify also its dynamic currents. It appears that some of them are definitely not equivalent to Noetherian forms.     

Winkelkorrelations- und Lebensdauer-Messungen am59Co

γγ angular correlations and delayed β-γ coincidences have been measured in the decay of⁵⁹Fe to⁵⁹Co.M1 andE2 transition probabilities were determined for the 143, 192, and 335 keV transition by measuring the 192–1099 keV, 335–1099 keV and 143–1292 keV correlations, and the half lives of the 1292 and 1434 keV levels. Theg-factor of the 1292 keV state was derived to beg=+1.09 ± 0.08 from the perturbation of the 143–1292 keV γγ angular correlation in ferromagnetic⁵⁹CoFe and⁵⁹CoNi samples. The results are discussed in terms of the weak coupling model.     

Momentum in relativistic four-particle interactions

A new proof of the recent theorem of Jordan and Shukre is given showing that if momentum is an integral of the motion then the interaction is zero. The new proof is based on a theorem about three curves in space time, which also implies the desired result for some four-particle interactions.