  The possibility of obtaining exotic statistics, different from Bose-Einstein
or Fermi-Dirac, is analyzed, in the context of quantum field theory, through
the inclusion of a counting operator in the definition of the partition
function. This operator represents the statistical weight of the allowed number
states. In particular, the statistics of ewkons (introduced in Phys. Rev. E 94,
062115, 2016) is analyzed. They have a negative relation between pressure and
energy density, a feature shared by dark energy. The present approach develops
the possibility of describing dark energy with a field of non-interacting
particles with ewkon's statistics.
