Singular coefficients in the K-theoretic Farrell-Jones conjecture
  Let G be a group and k a field of characteristic zero. We prove that if the Farrell-Jones conjecture for the K-theory of R[G] is satisfied for every smooth k-algebra R, then it is also satisfied for every commutative k-algebra R. 
Guillermo Corti\~nas and Emanuel Rodr\'iguez Cirone
math.KT