Speaker
Description
Large inflationary perturbations are a leading mechanism for primordial black hole (PBH) formation. Lattice simulations have been proposed as a route beyond perturbation theory, but their reliability has not been systematically established. In this talk, we demonstrate that certain implementations can produce significantly incorrect PBH abundances and identify the key sources of these failures. We derive concrete criteria for assessing the viability of lattice simulations and apply them across slow-roll, ultra-slow-roll, and strongly resonant regimes. Finally, we outline improved implementations that bring lattice techniques closer to delivering reliable non-perturbative predictions of large inflationary perturbations.
Based on: arXiv 2605.xxxx by W. Barker, B. Gladwyn and S. Zell