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In this talk I will present and discuss a recent proposal which affirms
that observations related to dark matter (DM) may be due to the existence
in nature of a massive spin-2 particle. The study of massive spin-2
particles falls within the recently constructed class of so called ghost
free bimetric theories, which has in its spectrum a massless and a
spin-2 particle. In certain parameter regimes the massive spin-2
effectively decouple so that the theory can properly be viewed as that of
a gravitating massive spin-2. We will see that in this case the massive
spin-2 naturally has the desired properties for explaining the DM
abundance, hence being a viable DM candidate. Additionally, the massless
spin-2 behaves in the standard fashion of GR and is the main source for
gravitational interactions of ordinary matter. We will discuss some of
virtues and shortcomings of the resulting theory vis-a-vis observations.
Related papers: arXiv:1607.03497, arXiv:1604.08564