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2020

On Primordial Black Holes from Rapid Turns in Two-field Models

Anguelova, Lilia

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We study rapid-turn trajectories in a class of two-field cosmological models, whose scalar manifold is the Poincar\'e disk.

Background solutions in multi-field inflation, with field-space trajectories exhibiting sharp turns, can seed primordial black hole (PBH) formation.
We investigate a class of exact solutions with hidden symmetry and show that they exhibit the kind of transient rapid-turn period, needed to induce PBH generation.
Furthermore, we relax the symmetry condition and find, in a certain regime, modified solutions with improved behavior of the Hubble $\eta$-parameter, which preserve the desired shape of the turning rate function.