Non perturbative effects of primordial curvature perturbations on the
  apparent value of a cosmological constant
  We study effects on the luminosity distance of a local inhomogeneity seeded
by primordial curvature perturbations of the type predicted by the inflationary
scenario and constrained by the cosmic microwave background radiation. We find
that a local underdensity originated from a one, two or three standard
deviations peaks of the primordial curvature perturbations field can induce
corrections to the value of a cosmological constant of the order of
$0.6%,1%,1.5%$ respectively. These effects cannot be neglected in the precision
cosmology era in which we are entering. Our results can be considered an upper
bound for the effect of the monopole component of the local non linear
structure which can arise from primordial curvature perturbations and requires
a fully non perturbative relativistic treatment.
