Abelian gauge fields coupled to simplicial quantum gravity

We study the coupling of abelian gauge theories to four-dimensional simplic ial quantum gravity. The gauge fields live on dual links. This is the corre ct formulation if we want to compare the effect of gauge fields on geometry with similar effects studied so far for scalar fields. It shows that gauge fields couple equally weakly to geometry as scalar fields, and it offers a n understanding of the relation between measure factors and abelian gauge f ields observed so-far.