  Results are presented of a first study of collisionless magnetic reconnection
starting from a recently found exact nonlinear force-free Vlasov-Maxwell
equilibrium. The initial state has a Harris sheet magnetic field profile in one
direction and a non-uniform guide field in a second direction, resulting in a
spatially constant magnetic field strength as well as a constant initial plasma
density and plasma pressure. It is found that the reconnection process
initially resembles guide field reconnection, but that a gradual transition to
anti-parallel reconnection happens as the system evolves. The time evolution of
a number of plasma parameters is investigated, and the results are compared
with simulations starting from a Harris sheet equilibrium and a Harris sheet
plus constant guide field equilibrium.
