Reheating the Standard Model from a hidden sector
  We consider a scenario where the inflaton decays to a hidden sector thermally
decoupled from the visible Standard Model sector. A tiny portal coupling
between the hidden and the visible sectors later heats the visible sector so
that the Standard Model degrees of freedom come to dominate the energy density
of the Universe before Big Bang Nucleosynthesis. We find that this scenario is
viable, although obtaining the correct dark matter abundance and retaining
successful Big Bang Nucleosynthesis is not obvious. We also show that the
isocurvature perturbations constituted by a primordial Higgs condensate are not
problematic for the viability of the scenario.
