On the nature of dark matter in the Coma Cluster
  Recent precise observations of the 2.7 K CMB by the Planck mission toward the
Coma cluster are not in agreement with X-ray measurements. To reconcile both
types of measuring techniques we suggest that unstable dark matter is the cause
of this mismatch. Decaying dark matter, which gravitationally dominates the
galaxy cluster, can affect the estimated hot plasma content, which is then
missing in the measured SZ effect from exactly the same place in the sky. The
model independent lifetime of dark matter decaying entirely to X-rays is
estimated to be about 6x10^{24} sec; this lifetime scales down with the
fraction of the radiatively decaying dark matter. In addition, it is shown that
the potential of such dark matter investigations in space is superior to the
largest volume Earth-bound dark matter decay searches. Other clusters might
provide additional evidence for or against this suggestion.
