Dec 15 – 16, 2022
Centre for Particle Theory, Durham
Europe/London timezone

Non-Gaussianity from preheating of non-minimally coupled inflaton

Dec 16, 2022, 10:10 AM
Ph30 (zoom room 2) (Centre for Particle Theory, Durham)

Ph30 (zoom room 2)

Centre for Particle Theory, Durham

Department of Physics Durham University South Road Durham DH1 3LE
Long talk (20 mins) Full Length Talks


Pulkit Ghoderao (Imperial College London)


Full non-linear simulations of massless preheating model have revealed a large non-Gaussianity can be generated. We study a more observationally viable model consisting of inflaton non-minimally coupled to gravity that decays into a massless scalar spectator during preheating.

Including the scale-dependence of Hubble rate places tight constraints on the 'cosmic variance', the values which the mean spectator field value can take. A negligible cosmic variance forces mean close to zero, and symmetry of many inflation potentials around zero dictates leading order non-perturbative treatment shall fail. Thus, we calculate sub-leading order term in the non-perturbative delta N formalism. As this calculation also needs to be performed keeping in mind the scale dependence, we show a scale-invariant way of solving momentum integrals is insufficient to yield the correct non-Gaussianity from preheating.

Type of presentation 20 minute talk
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Primary author

Pulkit Ghoderao (Imperial College London)

Presentation materials