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The emergence of the seeds of cosmic structure, from a perfect isotropic andhomogeneous Universe, has not been clearly explained by the standard version ofinflationary models as the dynamics involved preserve the homogeneity andisotropy at all times. A proposal that attempts to deal with this problem, byintroducing "the self-induced collapse hypothesis," has been introduced by D.Sudarsky and collaborators in previous papers. In all these works, the collapseof the wave function of the inflaton mode is restricted to occur during theinflationary period. In this paper, we analyse the possibility that thecollapse happens during the radiation era. A viable model can be constructedunder the condition that the inflaton field variable must be affected by thecollapse while the momentum variable can or cannot be affected. Anothercondition to be fulfilled is that the time of collapse must be independent of$k$. However, when comparing with recent observational data, the predictions ofthe model cannot be distinguished from the ones provided by the standardinflationary scenario. The main reason for this arises from the requirementthat primordial power spectrum obtained for the radiation era matches theamplitude of scalar fluctuations consistent with the latest CMB observations.This latter constraint results in a limit on the possible times of collapse andensures that the contribution of the inflaton field to the energy-momentumtensor is negligible compared to the contribution of the radiation fields.

Quantum collapse as source of the seeds of cosmic structure during the radiation era