\begin{document}$NN\rightarrow N\Delta$\end{document} cross sections based on a one-boson exchange model involves significant parameter uncertainties. In this work, we reduce these uncertainties by employing relativistic mean field models constrained by neutron star observations. Specifically, the range of the correction factors \begin{document}$R=\sigma^*_{NN\rightarrow N\Delta}/\sigma^{\rm free}_{NN\rightarrow N\Delta}$\end{document} is significantly narrowed at nuclear densities above saturation."> In-medium <i>NN</i> → <i>N</i>∆ cross sections from constrained relativistic mean field models -
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