Improved algorithm for U1 implementation of Complex phi4#164
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VictorVanthilt merged 1 commit intoApr 5, 2026
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Improve construction of complex φ⁴ tensor with U(1) symmetry
Refactors the internal algorithm for
phi4_complex(U1Irrep, ...)to exploit sparsity.Before: A
K⁸array was allocated and filled, then converted into a U(1)-symmetric TensorMap.After: An empty U(1) TensorMap is constructed first and filled directly by iterating over fusion tree pairs. Reducing memory usage from O(K⁸) to O(K⁶) (?) and enabling larger truncation dimensions (K=12 and beyond).
The interface is unchanged.