# The primordial curvature perturbation from lattice simulations

## TL;DR

This paper uses lattice simulations and an extended $
abla$ formalism to analyze how a reheating field during massless preheating influences primordial curvature perturbations, providing insights into non-perturbative reheating effects.

## Contribution

It introduces a novel combination of lattice simulations and an extended $
abla$ formalism to study the impact of reheating fields on primordial perturbations.

## Key findings

- Demonstrates the effectiveness of lattice simulations in this context
- Shows the potential observational signatures of non-perturbative reheating
- Provides a framework for future detailed studies of reheating effects

## Abstract

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.