The primordial curvature perturbation from lattice simulations
  We study the contribution to the primordial curvature perturbation on
observational scales generated by the reheating field in massless preheating.
To do so we use lattice simulations and a recent extension to the $\delta N$
formalism. The work demonstrates the functionality of these techniques for
calculating the observational signatures of models in which non-perturbative
reheating involves a light scalar field.
