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arXiv · 1604.06354

Spontaneous breaking of Lorentz symmetry in $(2+\epsilon)$-dimensional QED

Lukas Janssen
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Abstract

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 small $N < N_c^{\chi SB}$ the fermions are expected to develop a dynamical mass due to spontaneous chiral symmetry breaking. Using $\epsilon$ expansion near the lower critical dimension of 2, as well as the recent results on the generalization of the $F$ theorem to continuous dimension, we show that $N_c^{conf} > N_c^{\chi SB}$. 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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Lukas Janssen. 2016-04-21. Spontaneous breaking of Lorentz symmetry in $(2+\epsilon)$-dimensional QED. https://doi.org/10.1103/physrevd.94.094013

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