2012

Gauge field production in SUGRA inflation: local non-Gaussianity and primordial black holes

Linde, Andrei, Mooij, Sander, Pajer, Enrico

Understand

When inflation is driven by a pseudo-scalar field \chi coupled to vectors as \alpha/4 \chi F \tilde F, this coupling may lead to a copious production of gauge quanta, which in turns induces non-Gaussian and non-scale invariant corrections to curvature perturbations.

We point out that this mechanism is generically at work in a broad class of inflationary models in supergravity hence providing them with a rich set of observational predictions.
When the gauge fields are massless, significant effects on CMB scales emerge only for relatively large \alpha.
We show that in this regime, the curvature perturbations produced at the last stages of inflation have a relatively large amplitude that is of the order of the upper bound set by the possible production of primordial black holes by non-Gaussian perturbations.

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