Numerical data for the IMSRG applied to the P3H model

This dataset provides numerical solutions of the In-Medium Similarity Renormalization Group (IMSRG) applied to the pairing-plus-particle-hole (P3H) model. It contains flow-evolution for different IMSRG truncation schemes at b = 0.0 and b = 0.5: the single-reference IMSRG(2), IMSRG(3), IMSRG(4), and IMSRG(3f2) (all using the White-MP generator), together with the multi-reference variants MR-IMSRG(2), MR-IMSRG(2) without the λ3B approximation, and MR-IMSRG(3) with the λ3B/λ4B/λ5B truncation (all using the Brillouin generator). Each flow file is a whitespace-separated table whose first row is a header listing the tracked diagnostics (s, E, corrections, generator norm, operator norms, and their s-derivatives). In addition to the flow data, the package includes (i) full exact-diagonalization spectra on a (g, b) grid from −4 to 4 in steps of 0.1, (ii) Hartree–Fock and PNPBCS reference energies on the same grid, and (iii) the traces and Frobenius norms of the λ2B–λ5B cumulants of the PNPBCS reference as functions of g. All energies are dimensionless. See readme.txt for details. The data are intended to support the benchmarking of three-body truncation and induced-many-body closure schemes in the IMSRG.