Zero momentum modes in discrete light-cone quantization

Details Zero momentum modes in discrete light-cone quantization Zero momentum modes in discrete light-cone quantization

2009-03-06

arxiv.org/abs/0903.1239v2

Phys.Rev.D79:096012,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX/REVTeX, no figures; typos corrected, references added, discussion of zero-mode loops added

Scientific paper

10.1103/PhysRevD.79.096012

We consider the constrained zero modes found in the application of discrete light-cone quantization (DLCQ) to the nonperturbative solution of quantum field theories. These modes are usually neglected for simplicity, but we show that their inclusion can be relatively straightforward, and, what is more, that they are useful for nonperturbative calculations of field-theoretic spectra. In particular, inclusion of zero modes improves the convergence of the numerical calculation and makes possible the direct calculation of vacuum expectation values, even when the zero modes are determined dynamically. We also comment on zero-mode contributions not included by DLCQ, namely zero-mode loops.

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