\(200\,\mathrm{m\,s^{-1}}\
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Anti-Fourier heat flux does not certify the fourth-order closure state of a rarefied cavity
arXiv:2606.01480v1 Announce Type: new Abstract: Cold-to-hot heat transfer in rarefied cavities is usually treated as a signature of Fourier-law failure. Here it is used to ask whether a correct anti-Fourier heat-flux field certifies the flux-side fourth-order closure state. In a two-dimensional monatomic flow, the heat-flux hierarchy observes the divergence of the composite R26-level tensor \(A_{ij}=R^{\cl}_{ij}+\Delta\delta_{ij}/3\), not the tensorial fourth-order anisotropy...