Orateur
Description
The nature of Dark Matter (DM) is one of the greatest puzzles of modern
particle physics and cosmology. Although overwhelming observational
evidences from galactic to cosmological scales point to the existence of
DM, after decades of experimental effort only its gravitational
interaction has been experimentally confirmed. Currently, we do not have
any clue on DM properties, such as its spin, mass, interactions other
than gravitational, symmetry responsible for its stability, number of
states associated to it, and possible particles that would mediate the
interactions between DM and the standard model (SM) particles.
If DM is light enough and interacts with SM particles directly or via
some mediators with a strength beyond the gravitational one, its elusive
nature can be decoded or constrained though combined searches: a) from
direct production at colliders b) via the relic density precisely
measured through the observations of cosmic microwave background (CMB)
anisotropies by WMAP and PLANCK collaborations; c) from DM direct
detection (DD) experiments, which are sensitive to elastic spin
independent (SI) or spin dependent (SD) DM scattering off nuclei; d)
from DM indirect detection searches, that look for SM particles produced
in the decay or annihilation of DM present in the cosmos, both with high
energies observables (gamma-rays, neutrinos, charge cosmic rays)
produced in the local Universe, and by studying the effects of energy
produced by DM annihilation in the early universe on the properties of
the CMB spectrum.
Decoding of unknown underlying theory of DM requires systematic
approach.Therefore we suggest the classification of Dark Matter models
with mediator multiplets of different spins charged under the weak
group. This classification allows to identify models which are already
excluded and those models and signatures which can be tested and
possibly discovered at the LHC, future colliders and non-colldier
experiments. Systematic exploration of DM models and their signatures
at present creates the ground for the discovery of DM and its
identification in the near future.
Several classes of those models are discussed.
