Geometric corrections to cosmological entanglement
  We investigate entanglement production by inhomogeneous perturbations over a
homogeneous and isotropic cosmic background, demonstrating that the interplay
between quantum and geometric effects can have relevant consequences on
entanglement entropy, with respect to homogeneous scenarios. To do so, we focus
on a conformally coupled scalar field and discuss how geometric production of
scalar particles leads to entanglement. Perturbatively, at first order we find
oscillations in entropy correction, whereas at second order the underlying
geometry induces mode-mixing on entanglement production. We thus quantify
entanglement solely due to geometrical contribution and compare our outcomes
with previous findings. We characterize the geometric contribution through
geometric (quasi)-particles, interpreted as dark matter candidates.
