“Loop the loop”

The applicability of the collective coordinate method (saddle-point approximation) for large-N planar models is discussed. Some unstated assumptions are clarified. Statements that Wilson loops form a complete set of gauge invariant operators are also examined and a set of generalized algebraic Mandelstam relations among Wilson loops is presented. The inclusion of loops that wind around themselves and cross many times, as independent variables, is stressed.     

“Almost direct” photons

Quantum chromodynamics has intensified the interest and enhanced the importance of measuring the production of direct photons in hadron collisions. We point out that lepton pairs of low invariant mass (m² < m²_ψ) provide an equally good probe for testing Q.C.D. Their experimental observation is not only easier, the relevant data may already exist.     

“It's been plenty of time ...”

Die Geburtsstunde der theoretischen Nanotechnologie wird heute gerne auf den 29. Dezember 1959 zurückdatiert. An diesem Tag äußerte der spätere Nobelpreisträger Richard Feynman in seiner Bankettansprache “There's Plenty of Room at the Bottom” erste Gedanken zu einer extremen Erhöhung von Datenspeicherdichten. Nanotechnologen sehen sich mit ihrer Arbeit in der Tradition seiner Ideen.     

On “diagonal” Bianchi cosmologies

A list of the possible “diagonal” Bianchi cosmologies is given, with a proof that it is complete.     

Isotrope und homogene Materie – „Kosmen”︁

On Dynamics and Thermodynamics of Isotropic Matter-Universes The dynamics and thermodynamics of great cosmical systems are nearly independent of the theory of gravitation and only the “fine-structure” of cosmogony and cosmology reflects the special hypotheses. The neutrality against the concret gravodynamics is a consequence of the fundamental properties of gravitation: the principlies of equivalence of gravity and inertia.