  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 $1 \leq d <3$, 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 $2\leq d<3$, which
suggests that the IP in $d=3$ is solely generated by the presence of a
regulator.
