  Protecting the inflationary potential from quantum corrections typically
requires symmetries that constrain the form of couplings of the inflaton to
other sectors. We will explore how these restrictions affect reheating in
models with UV completions. In particular, we look at how reheating occurs when
inflation is governed by closed strings, using N-flation as an example. We find
that coupling the inflaton preferentially to the Standard Model is difficult,
and hidden sectors are typically reheated. Observational constraints are only
met by a fraction of the models. In some working models, relativistic relics in
the hidden sector provide dark matter candidates with masses that range from
keV to PeV, with lighter masses being preferred.
