Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays
O. E. Kalashev, M. Yu. Kuznetsov
Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow, Russia
Abstract
We examine the role of the large-scale anisotropy of the high-energy
cosmic ray distribution in a search for the heavy decaying dark matter (DM)
signal.
Using recent anisotropy measurements from the extensive air shower (EAS)
observatories we constrain the lifetime of the DM particles
with masses GeV. These constraints
appear to be weaker than that obtained with the high energy gamma-ray
limits.
We also estimate the desired precision level for the anisotropy measurements
to discern the decaying DM signal marginally allowed by the gamma-ray limits
and discuss the prospects
of the DM search with the modern EAS facilities.