Galactic cluster winds in presence of a dark energy
  We obtain a solution for the hydrodynamic outflow of the polytropic gas from
the gravitating center, in presence of the uniform Dark Energy (DE). The
antigravity of DE is enlightening the outflow and make the outflow possible at
smaller initial temperature, at the same density. The main property of the wind
in presence of DE is its unlimited acceleration after passing the critical
point. In application of this solution to the winds from galaxy clusters we
suggest that collision of the strongly accelerated wind with another galaxy
cluster, or with another galactic cluster wind could lead to the formation of a
highest energy cosmic rays.
