| Abstract: |
Primordial Black Holes (PBHs) are a compelling candidate for dark matter. Cosmic Inflation provides a natural framework for describing their origin, and in particular single field models of inflation provide a minimal model for realizing the amplification of cosmological perturbations needed to form PBHs. However, single-field models are at best a toy model for high energy physics: realistic models (GUTs, supersymmetry, string theory) generally have many scalar degrees of freedom at high energies, and even the Standard Model of particle physics has four real scalars. In this talk I will discuss the role that multifield models can play in PBH production: (1) multifield models can provide a UV completion, with single-field PBH models realized as effectively single-field dynamics in a multifield system, and (2) multifield dynamics can lead to new physics and new models for PBH production, as exemplified by the spectator fields model recently proposed in arXiv:2504.13251. Lastly, multifield models provide new perspectives on the fine tuning needed to realize PBHs from cosmic inflation.
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