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Abstract |
The observed dark matter (DM) abundance in the Universe can be fully accounted for by a minimally
coupled spectator scalar field that was light during cosmic inflation. In this scenario, dark matter was
produced during inflation by amplification of quantum fluctuations of the spectator field. I will discuss the
DM isocurvature perturbations that are unavoidably generated in such scenarios and the circumstances
under which they are not problematic for the viability of non-thermal DM models. I will also discuss
implications of DM isocurvature for structure formation, showing that the model has interesting
consequences which allow one to test the scenario. |
