Abstract
The Lyman Continuum photon production efficiency ($\xi_ion$) is a
critical ingredient for inferring the number of photons available to reionise
the intergalactic medium. To estimate the theoretical production efficiency in
the high-redshift Universe we couple the BlueTides cosmological hydrodynamical
simulation with a range of stellar population synthesis models. We find Lyman
Continuum photon production efficiencies of $łog_10(\xi_ion/\rm
erg^-1\, Hz)25.1-25.5$ depending on the choice of stellar population
synthesis model. These results are broadly consistent with recent observational
constraints at high-redshift though favour a model incorporating the effects of
binary evolution
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