Hidden Symmetries, Rapid Turns and Cosmic Acceleration

TL;DR

This paper reviews how hidden symmetries in multifield cosmological models enable the discovery of exact solutions for inflation, dark energy, and primordial black hole generation, often involving rapid field-space turns.

Contribution

It demonstrates the use of hidden symmetries to find exact solutions in two-field cosmological models, including inflationary and dark energy scenarios.

Findings

Exact inflationary solutions with primordial black hole implications.

A dark energy solution derived via hidden symmetry.

Field trajectories exhibit rapid turns in these models.

Abstract

Hidden symmetries provide a powerful tool for finding exact solutions in multifield cosmological models. We review how, using such symmetries, one can find inflationary solutions in two-field models, which lead to the generation of primordial black holes. We also discuss an exact solution in a two-field cosmological model, which describes dark energy. This solution is obtained with the use of a hidden symmetry, although the latter is broken by a constant term in the scalar potential. All of the above solutions are characterized by field-space trajectories with rapid turns.