  In this paper we study the effect of reacceleration provided by turbulences
on electrons produced by dark matter (DM) annihilation in the Coma cluster. We
use a simplified phenomenological model to describe the effect of the
turbulences, and explore a limited subset of three possible DM models for
neutralino particles with different mass and annihilation channel. We find
that, for values of the annihilation cross section of the order of the upper
limits found with Fermi-LAT measurements in astrophysical objects, and for
conservative values of the boosting factor due to DM substructures, the
reacceleration due to turbulences can enhance the radio emission produced by
DM-originated electrons up to the level of the observed flux of the radio halo
in Coma, for moderate reacceleration intensity in relatively short times.
Therefore we conclude that, even if it is not possible to distinguish between
the fits obtained in this paper because of the scattering present in the radio
flux data, the electrons produced by DM annihilation can be possible seed
electrons for the reacceleration, as well as secondary electrons of hadronic
origin. A possible discriminant between these two classes of models is the flux
produced in the gamma ray band, that in the case of DM-originated electrons
should be more than two orders of magnitude smaller than the present Fermi-LAT
upper limits, whereas in the hadronic case the expected gamma ray flux should
be close to the value of present upper limits.
