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We study the contribution to the primordial curvature perturbation onobservational 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 forcalculating the observational signatures of models in which non-perturbativereheating involves a light scalar field.

The primordial curvature perturbation from lattice simulations