Symmetries of the Similarity Renormalization Group for Nuclear Forces
  We analyze the role played by Long Distance Symmetries within the context of the Similarity Renormalization Group (SRG) approach, which is based on phase-shift preserving continuous unitary transformations that evolve hamiltonians with a cutoff on energy differences. We find that there is a SRG cutoff for which almost perfect fulfillment of Wigner symmetry is found. We discuss the possible consequences of such finding. 
Varese Salvador Timoteo, Sergio Szpigel and Enrique Ruiz Arriola
nucl-th