We give an elementary analysis of the multiplicator group of the Galilei group in 1+2 dimensions G â†‘ +. For a non-trivial multiplicator we give a list of all the corresponding projective unitaryâ€¦ (More)

We continue our study of non-Abelian gauge theories in the framework of Epstein-Glaser approach to renormalisation theory. We consider the case when massive spin-one Bosons are present into theâ€¦ (More)

We consider the gauge invariance of the standard Yang-Mills model in the framework of the causal approach of Epstein-Glaser and Scharf and determine the generic form of the anomalies. The method usedâ€¦ (More)

A geometric global formulation of the higher-order Lagrangian formalism for systems with finite number of degrees of freedom is provided. The formalism is applied to the study of systems with groupsâ€¦ (More)

We generalise a result of Aste and Scharf saying that, under some reasonable assumptions, consistent with renormalisation theory, the non-Abelian gauge theories describes the only possibility ofâ€¦ (More)

We present a new point of view on the quantization of the gravitational field, namely we use exclusively the quantum framework of the second quantization. More explicitly, we take as one-particleâ€¦ (More)

The geometric Lagrangian theory is based on the analysis of some basic mathematical objects such as: the contact ideal, the (exact) variational sequence, the existence of EulerLagrange andâ€¦ (More)

We present an extremely simple solution to the renormalization of quantum electrodynamics based on Epstein-Glaser approach to renormalization theory. e-mail: grigore@theor1.theory.nipne.ro,â€¦ (More)

We continue the study of symmetries in the Lagrangian formalism of arbitrary order with the help of the so-called Anderson-Duchamp-Krupka equations. For the case of secondorder equations andâ€¦ (More)