Some general new Einstein Walker manifolds
  In this paper, Lie symmetry group method is applied to find the lie point symmetries group of a PDE system that is determined general form of four-dimensional Einstein Walker manifold. Also we will construct the optimal system of one-dimensional Lie subalgebras and investigate some of its group invariant solutions. 
Mehdi Nadjafikhah and Mehdi Jafari
math.DG math-ph math.MP