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首页> 外文期刊>Physical review, D >Spontaneous breaking of Lorentz symmetry in (2+epsilon)-dimensional QED
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Spontaneous breaking of Lorentz symmetry in (2+epsilon)-dimensional QED

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摘要

The phase diagram of massless quantum electrodynamics in three space-time dimensions as a function of fermion flavor number N exhibits two well-known phases: at large N > N-c(conf) the system is in a conformal gapless state, while for smallN N-c(chi SB). There is therefore an intermediate range of values of N at which a third phase is stabilized. We demonstrate that this phase is characterized by spontaneous breaking of Lorentz symmetry, in which a composite vector boson field acquires a vacuum expectation value with the fermions and the photon remaining massless.

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