  The nature of cosmological dark matter finds its explanation in physics
beyond the Standard model of elementary particles. The landscape of dark matter
candidates contains a wide variety of species, either elusive or hardly
detectable in direct experimental searches. Even in case, when such searches
are possible the interpretation of their results implies additional sources of
information, which provide indirect effects of dark matter. Some nontrivial
probes for the nature of the dark matter are presented in the present issue.
