Reconciling spontaneous scalarization with cosmology
  We discuss the Damour--Esposito-Far\`ese model of gravity, which predicts the
spontaneous scalarization of neutron stars in a certain range of parameter
space. In the cosmological setup, the scalar field responsible for
scalarization is subject to a tachyonic instability during inflation and the
matter domination stage, resulting in a large value of the field today. This
value feeds into the PPN parameters, which turn out to be in gross conflict
with the Solar system measurements. We modify the original
Damour--Esposito-Far\`ese model by coupling the scalar to the inflaton field.
This coupling acts as an effective mass for the scalar during inflation. For
generic couplings that are not extremely small, the scalar (including its
perturbations) relaxes to zero with an exponential accuracy by the beginning of
the hot stage. While the scalar exhibits growth during the subsequent
cosmological stages, the resulting present value remains very small---in a
comfortable agreement with the Solar system tests.
