The Simplicial Model of Univalent Foundations (after Voevodsky)
  We present Voevodsky's construction of a model of univalent type theory in the category of simplicial sets.   To this end, we first give a general technique for constructing categorical models of dependent type theory, using universes to obtain coherence. We then construct a (weakly) universal Kan fibration, and use it to exhibit a model in simplicial sets. Lastly, we introduce the Univalence Axiom, in several equivalent formulations, and show that it holds in our model.   As a corollary, we conclude that Martin-L\"of type theory with one univalent universe (formulated in terms of contextual categories) is at least as consistent as ZFC with two inaccessible cardinals. 
Chris Kapulkin and Peter LeFanu Lumsdaine
math.LO math.AT math.CT