Wilsonian vs. 1PI renormalization group flow irreversibility
  We present a line of reasoning based on the analysis of scale variations of the Wilsonian partition function and the trace of the stress tensor in a curved manifold which results in a statement of irreversibility of Wilsonian renormalization group flow for unitary theories. We also analyze subtleties related to subtractions in the case of the 1PI effective action flow. 
Jordi Comellas and Jose I. Latorre