Density Fluctuations in Inflationary Models with Multiple Scalar Fields

TL;DR

This paper proposes a phenomenological model where density fluctuations from multiple scalar fields during inflation lead to primordial black holes, potentially explaining observed massive compact halo objects.

Contribution

It introduces a new model linking isocurvature fluctuations in multi-field inflation to primordial black hole formation, offering a novel explanation for dark matter candidates.

Findings

Primordial black holes can form from density fluctuations in multi-field inflation.

The model accounts for massive compact halo objects as primordial black holes.

Potential implications for dark matter composition.

Abstract

Making use of the primordially isocurvature fluctuations, which are generated in inflationary models with multiple scalar fields, we make a phenomenological model that predicts formation of primordial black holes which can account for the massive compact halo objects recently observed.