The One-dimensional KPZ Equation and the Airy Process
  Our previous work on the one-dimensional KPZ equation with sharp wedge initial data is extended to the case of the joint height statistics at n spatial points for some common fixed time. Assuming a particular factorization, we compute an n-point generating function and write it in terms of a Fredholm determinant. For long times the generating function converges to a limit, which is established to be equivalent to the standard expression of the n-point distribution of the Airy process. 
Sylvain Prolhac and Herbert Spohn
cond-mat.stat-mech math-ph math.MP