2:30pm Monday April 12 in Curia II
The coherence of the oscillating inflaton during a second order phase transition combined with the strong resonances associated with preheating imply new evolution classes for super-Hubble metric perturbations. Whereas previously it was believed that perturbations relevant for large-angle CMB anisotropies were insensitive to reheating for causality reasons, we will show that infact the standard conservation laws for perturbations fail during preheating due to the amplification of entropy perturbations and that strong resonances can drive metric perturbations nonlinear, both on super- and sub-Hubble scales. This excludes certain ranges of parameter space as unphysical, breaks the scale invariance of the primordial perturbation spectrum and leads to enhanced possibilities of primordial black hole formation at preheating.