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We study a meson mass splitting due to isospin violation in holographic densematter. We work in a D4/D6/D6 model with two quark flavor branes to considerasymmetric dense matter in holographic QCD. We mainly consider two cases. Wefirst consider $m^+/m^-\sim m_d/m_u$ to study the effect of isospin violationon the meson masses. Then, we take $m^+/m^-\sim m_s/m_q$, where$m_q\sim(m_u+m_d)/2$, to calculate in-medium kaon-like meson masses. In bothcases we observe that the mass splitting of charged mesons occurs at lowdensities due to the asymmetry, while at high densities their masses becomedegenerate. At intermediate densities, we find an exotic behavior in masseswhich could be partly understood in a simple picture based on the Pauliexclusion principle.

Holographic meson mass in asymmetric dense matter