A method is proposed to generate sum-of-squares decompositions for fermionic Hamiltonians containing large density-density terms by modifying the perturbative choice of cubic operators.
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Improving Perturbation Theory with the Sum-of-squares II: Large Density-Density Terms
A method is proposed to generate sum-of-squares decompositions for fermionic Hamiltonians containing large density-density terms by modifying the perturbative choice of cubic operators.