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.
Basak, Multiresolution analysis of quantum theories using daubechies wavelet basis (2025), arXiv:2512.18372 [hep-th]
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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.