Fractal propagators in QED and QCD and implications for the problem of confinement
AUTOR(ES)
Gulzari, S., Srivastava, Y. N., Swain, J., Widom, A.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2007-03
RESUMO
We show that QED radiative corrections change the propagator of a charged Dirac particle so that it acquires a fractional anomalous exponent connected with the fine structure constant. The result is a nonlocal object which represents a particle with a roughened trajectory whose fractal dimension can be calculated. This represents a significant shift from the traditional Wigner notions of asymptotic states with sharp well-defined masses. Non-Abelian long-range fields are more difficult to handle, but we are able to calculate the effects due to Newtonian gravitational corrections. We suggest a new approach to confinement in QCD based on a particle trajectory acquiring a fractal dimension which goes to zero in the infrared as a consequence of self-interaction, representing a particle which, in the infrared limit, cannot propagate.
