Momentum-space Daubechies wavelets enable a Hamiltonian truncation for 1+1D phi^4 theory that captures the strong-coupling phase transition with converging critical coupling.
Multiresolution approximations and wavelet orthonormal bases ofl2(r).Transactions of the American Mathematical Society, 315:69–87, 1989
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Hamiltonian formulation of the $1+1$-dimensional $\phi^4$ theory in a momentum-space Daubechies wavelet basis
Momentum-space Daubechies wavelets enable a Hamiltonian truncation for 1+1D phi^4 theory that captures the strong-coupling phase transition with converging critical coupling.