Inhomogeneous condensation in the Gross-Neveu model in noninteger spatial dimensions $1\le d<3$

Abstract

The Gross-Neveu model in the $N\to \infty$ approximation in $d=1$ spatial dimensions exhibits a chiral inhomogeneous phase (IP), where the chiral condensate has a spatial dependence that spontaneously breaks translational invariance and the ${\mathbb{Z}}_2$ chiral symmetry. This phase is absent in $d=2$, while in $d=3$ its existence and extent strongly depends on the regularization and the value of the finite regulator. This work connects these three results smoothly by extending the analysis to non-integer spatial dimensions $1\le d<3$, where the model is fully renormalizable. To this end, we adapt the stability analysis, which probes the stability of the homogeneous ground state under inhomogeneous perturbations, to non-integer spatial dimensions. We find that the IP is present for all $d<2$ and vanishes exactly at $d=2$. Moreover, we find no instability towards an IP for $2\le d<3$, which suggests that the IP in $d=3$ is solely generated by the presence of a regulator.

14 pages, 6 figures. v2: corrected an error in the analysis for figure 6, version as accepted for publication in Physical Review D

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• Inhomogeneous chiral condensates
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• Inhomogeneous phases in the quark-meson model with vacuum fluctuations
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• Fermions in the pseudoparticle approach
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• Phase diagram of the non-uniform chiral condensate in different regularization schemes at T=0
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• Reconsideration of the 2-flavor NJL model with dimensional regularization at finite temperature and density

Cited by in corpus (6)

• Regularization effects in the Nambu-Jona-Lasinio model: Strong scheme dependence of inhomogeneous phases and persistence of the moat regime
• Inhomogeneous condensation in the Gross-Neveu model in noninteger spatial dimensions $1\le d<3$. II. Nonzero temperature and chemical potential
• Spatially oscillating correlation functions in $\left(2+1\right)$-dimensional four-fermion models: The mixing of scalar and vector modes at finite density
• Dilepton production from moaton quasiparticles
• Revisiting the spatially inhomogeneous condensates in the $(1+1)$-dimensional chiral Gross-Neveu model via the bosonic two-point function in the infinite-$N$ limit
• Dissecting the moat regime at low energies I: Renormalization and the phase structure