Daubechies wavelets turn the free scalar field Hamiltonian into coupled oscillators that SRG flow equations block-diagonalize by resolution, allowing low-energy spectrum extraction from the lowest-resolution block alone.
Daubechies, Orthonormal bases of compactly supported wavelets, Communications on Pure and Applied Mathematics41, 909 (1988)
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An efficient Wavelet-Based Hamiltonian Formulation of Quantum Field Theories using Flow-Equations
Daubechies wavelets turn the free scalar field Hamiltonian into coupled oscillators that SRG flow equations block-diagonalize by resolution, allowing low-energy spectrum extraction from the lowest-resolution block alone.