出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on the infrared limit of the quenched lattice Landau gauge gluon and ghost propagators
computed from large asymmetric lattices. In particular, the compatibility of the pure power law
infrared solutions of the Dyson-Schwinger equations with the lattice data is investigated and the
exponent k is measured. The gluon lattice data favour k 0:52, which would imply a vanishing
zero momentum gluon propagator. For the subset of lattices where the ghost propagator was
computed, the data are not compatible with a pure power law. Our data also show a decreasing
running coupling in the infrared region. Furthermore, positivity violation for the gluon propagator
is also verified.
