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The modification of vector mesons at finite density is studied by using QCD sum rules in combination with the maximum entropy method. As a result, it is found that the ρ andω receive a negative mass shift of about 100 MeV at nuclear matter density, which is consistent with previous studies. This finding however strongly depends of the factorization assumption of the four-quark condensate, which might not be quantitatively reliable. On the other hand, we find that the mass shift of theφ is smaller, but much less dependent on the four quark condensate. Instead, our results show that the φ mass shift is strongly correlated to the strangeness content of the nucleon, which governs the depletion of the strange quark condensate in nuclear matter.

Vector mesons at finite density from QCD sum rules and the maximum entropy method