Operator Evolution Using SRG Flow Equations for Few-Body Systems

The Similarity Renormalization Group (SRG) flow equations are a series of unitary transformations which can be used to to achieve different patterns of decoupling in a Hamiltonian. An SRG transformation applied to internucleon interactions leads to greatly improved convergence properties while preserving observables. Not only does it provide a way to consistently evolve many-body potentials, but also other operators.\footnote{S.K. Bogner, R.J. Furnstahl, and R.J. Perry, Phys. Rev. C 75 (2007) 061001.} Here, a method to implement SRG evolved few-body operators is applied to both model and realistic calculations. Properties of the corresponding observables are explored for both long- and short- range operators. Methods to improve their convergence in a truncated model space are also considered.