Mimicking dark matter in Horndeski gravity
  Since the rediscovery of Horndeski gravity, a lot of work has been devoted to
the exploration of its properties, especially in the context of dark energy.
However, one sector of this theory, namely the one containing the coupling of
the Einstein tensor to the kinetic term of the scalar field, shows some
surprising features in the construction of black holes and neutron stars.
Motivated by these new results, I explore the possibility that this sector of
Horndeski gravity can mimic cold dark matter at cosmological level and also
explain the flattening of galactic rotation curves. I will show that, in
principle, it is possible to achieve both goals with at least two scalar fields
and a minimal set of assumptions.
