The $\mathrm{\Sigma }\mathrm{\Sigma }$ interactions in finite-density QCD sum rules

The properties of $\mathrm{\Sigma }$-hyperons in pure $\mathrm{\Sigma }$ matter are studied with the finite-density quantum chromo-dynamics sum rule (QCDSR) approach. The $\mathrm{\Sigma }\mathrm{\Sigma }$ nuclear potential $U_{\mathrm{\Sigma }}$ is most likely strongly attractive, it could be about -50 MeV or even more attractive at normal nuclear density. If this prediction is the case, the interactions between $\mathrm{\Sigma }$-hyperons should play crucial roles in the strange nuclear matter, when there are multi-$\mathrm{\Sigma }$ hyperons. The bound state of double-$\mathrm{\Sigma }$ maybe exist.