A full analytic calculation of the two-loop diagrams contributing to the static potential in QCD is presented in detail. Using a renormal-ization group improvement, the \three-loop" potential in momentum space is thus derived and the third coeecient of the-function for the V-scheme is given. The Fourier transformation to position space is then performed, and the result is brieey discussed.

What happens to the uncertainity relations along the process of gravitational collapses ? What is the position-space wave function of two finite volume massive bosons if we take contact interaction into account? What is the microscopic explanation in terms of particle exchanges of the force in the Casimir effect?

We define a finite-differences derivative operation, on a non uniformly spaced partition, which has the exponential function as an exact eigenvector. We discuss some properties of this operator and we propose a definition for the components of a finite-differences momentum operator. This allows us to perform exact discrete calculations.

A new approach to quantum Markov processes is developed and the corresponding Fokker-Planck-like equation is derived. The latter was examined to reproduce known results from classical and quantum physics. It was also applied to the phase-space description of a mechanical system thus leading to a new treatment of this problem different from the Wigner presentation. The equilibrium probability de...

Abstract. The spin structure of nucleon at twist 2 and 3 levels is analyzed. The contribution of quark and gluon spins to nucleon spin are Lorentz invariant, while it is not sure for orbital angular momentum. The conserved fractional moments of transversity distribution are considered. The scenario of decoupled total angular momentum, determined predominantly by the unpolarized scattering, is d...

The behavior of an organism often exhibits biases consistent with an anticipation of future behavior. One such type of bias results in momentum-like effects in which past behavior is extrapolated or continued into the future, and examples include behavioral momentum and psychological momentum. Similarities and differences between behavioral momentum and psychological momentum are considered. It...

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Some results from arguments of research dealt with R. Raczka are exposed and extended. In particular new arguments are brought in favor of the conjecture, formulated with him, that both space-time and momentum may be conformally compactified, building up a compact phase space of automorphism for the conformal group, where conformal reflections determine a convolution between space-time and mome...