Quantum Mechanical Probability Interpretation In The Mini-superspace   Model Of Higher Order Gravity Theory
  It has been shown that inclusion of higher order curvature invariant terms in the Robertson-Walker minisuperspace model of the Einstein-Hilbert action leads to Schrodinger like equation, whose corresponding effective action is hermitian. Thus, it is possible to write the continuity equation in a straight forward manner, which reveals a quantum mechanical probability interpretation of the theory. 
Abhik Kumar Sanyal