The Quantum Effective Action, Wave Functions and Yang-Mills (2+1)
  We explore the relationship between the quantum effective action and the ground state (and excited state) wave functions of a field theory. Applied to the Yang-Mills theory in 2+1 dimensions, we find the leading terms of the effective action from the ground state wave function previously obtained in the Hamiltonian formalism by solving the Schrodinger equation. 
V.P. Nair
hep-th hep-ph math-ph math.MP