Dark Radiation in LARGE Volume Models
  We consider reheating driven by volume modulus decays in the LARGE Volume
Scenario. Such reheating always generates non-zero dark radiation through the
decays to the axion partner, while the only competitive visible sector decays
are Higgs pairs via the Giudice-Masiero term. In the framework of sequestered
models where the cosmological moduli problem is absent, the simplest model with
a shift-symmetric Higgs sector generates 1.56 < N_{eff} - N_{eff,SM} < 1.74.
For more general cases, the known experimental bounds on N_{eff} strongly
constrain the parameters and matter content of the models.
