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We prove that the Yang-Mills equations in the Lorenz gauge (YM-LG) is locallywell-posed for data below the energy norm, in particular, we can take data forthe gauge potential $A$ and the associated curvature $F$ in $H^s\times H^{s-1}$and $H^r\times H^{r-1}$ for $s=(\frac67+,-\frac1{14} +)$, respectively. Thisextends a recent by Selberg and the present author on the local well-posednessof YM-LG for finite energy data (specifically, for $(s, r)=(1-, 0)$). We alsoprove unconditional uniqueness of the energy class solution, that is,uniqueness in the classical space $C([-T, T]; X_0)$, where $X_0$ is the energydata space. The key ingredient in the proof is the fact that most bilinearterms in YM-LG contain null structure some of which uncovered in the presentpaper.

Local well-posedness of Yang-Mills equations in Lorenz gauge below the energy norm