In this seminar, I will present our latest results of our study on the behavior of the phi-meson at finite density [1], which makes use of a QCD sum rule approach in combination with the maximum entropy method [2]. As earlier works have already shown, we find a strong correlation between a possible mass shift of the phi-meson in nuclear matter and the strangeness content of the nucleon, which is proportional to the strange sigma term, sigma_{sN}. In contrast to other studies, we however find that, depending on the value of sigma_{sN}, the phi-meson could receive both a positive or negative mass shift at nuclear matter density. I will discuss the relevance of our results for the interpretation of the E325 experiment, which was performed at KEK and for the future E16 experiment to be carried out at the J-PARC facility.

If time allows, I will also briefly describe a few possible other applications of our method, such as investigating the behavior of in hadrons in a magnetic field or the study of some basic properties of the unitary fermi gas.

[1] P. Gubler and K. Ohtani, arXiv:1404.7701 [hep-ph].

[2] P. Gubler and M. Oka, Prog. Theor. Phys. 124, 995 (2010), arXiv:1005.2459 [hep-ph].