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Title: Outcomes of strong particle production

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Abstract: In this talk I will discuss multi-field models of inflation where there are instabilities and strong particle production due to, a priori harmless, irrelevant operators. The instabilities can move the trajectory to a new multi-field attractor where the inflaton potential can be steeper thus proving an improved microphysical picture for inflation.
I will focus in models with a fast turning rate in field space. These models have generic features both at the level of the background and perturbations. I will present some recent results on the size and shape of the bispectrum and trispectrum. In the end, I will confront the different predictions for the spectrum against observations and discuss possible constraints from the overproduction of primordial black holes.

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