Skobeltsyn Institute of Nuclear Physics
Lomonosov Moscow State University

Some problems concerning small scale structure recently emerged in Cold
Dark Matter scenario: missing satellites problem, cusped density profiles
problem and lack of galactic angular momentum. All these problems seem to
have solution in scenarios with Warm Dark Matter.

We discuss keV gravitino as possible warm dark matter candidate. The only
way for this model to satisfy cosmological constraints is to have
gravitino mass in the range 1 keV < m_g < 15 keV and sufficiently light
colorless superparticles M < 350 GeV. Masses of all colored superparticles
have to exceed reheat temperature, which is in the TeV range in our
scenario. Smallness of colorless superparticle masses implies that the
gravitino warm dark matter scenario will be either ruled out or supported
by the LHC experiments.