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Lattice measurement of the energy-gap in a spontaneously broken phase

P. Cea·M. Consoli·L. Cosmai
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Abstract

Using lattice simulations of a one-component $(λΦ^4)_4$ theory, we have measured the energy spectrum $ω({\mathbf{k}})$ in the broken phase at various lattice sizes. Our data show that the energy-gap $ω(0)$ is {\it not} the `Higgs mass' $M_h$ but an infrared-sensitive quantity that becomes smaller and smaller by increasing the lattice size and may even vanish in the infinite-volume limit.

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P. Cea, M. Consoli, L. Cosmai. 2001-03-22. Lattice measurement of the energy-gap in a spontaneously broken phase. https://arxiv.org/abs/hep-ph/0101219

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