Adding a perturbative zero-mode correction to DLCQ calculations of 2D phi^4 theory yields the same continuum critical coupling with an order-of-magnitude smaller basis.
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Critical coupling with zero-mode corrections in discretized light-cone quantized $\phi^4$ theory
Adding a perturbative zero-mode correction to DLCQ calculations of 2D phi^4 theory yields the same continuum critical coupling with an order-of-magnitude smaller basis.