The Similarity Renormalization Group with Novel Generators

TL;DR

This paper explores alternative generator choices in the SRG flow equation to improve the efficiency of Hamiltonian evolution in nuclear physics, expanding beyond the traditional kinetic energy generator.

Contribution

It introduces novel generator variations for the SRG method, demonstrating potential for more efficient Hamiltonian evolution while maintaining key advantages.

Findings

Alternative generators can accelerate SRG evolution.

Variations maintain the benefits of the standard approach.

Potential for improved computational efficiency in nuclear interactions.

Abstract

The choice of generator in the Similarity Renormalization Group (SRG) flow equation determines the evolution pattern of the Hamiltonian. The kinetic energy has been used in the generator for most prior applications to nuclear interactions, and other options have been largely unexplored. Here we show how variations of this standard choice can allow the evolution to proceed more efficiently without losing its advantages.