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We study the nucleon electromagnetic (EM) form factors in symmetric nuclearmatter as well as in vacuum within a light-front approach using the in-mediuminputs calculated by the quark-meson coupling model. The same in-medium quarkproperties are used as those used for the study of in-medium pion properties.The zero of the proton EM form factor ratio in vacuum, the electric to magneticform factor ratio $\mu_p G_{Ep}(Q^2)/G_{Mp}(Q^2)$ ($Q^2 = -q^2 > 0$ with $q$being the four-momentum transfer), is determined including the latestexperimental data by implementing a hard constituent quark component in thenucleon wave function. A reasonable fit is achieved for the ratio$\mu_pG_{Ep}(Q^2)/G_{Mp}(Q^2)$ in vacuum, and we predict that the $Q_0^2$ valueto cross the zero of the ratio to be about 15 GeV$^2$. In addition the doubleratio data of the proton EM form factors in $^4$He and H nuclei, $[G^{^4{\rmHe}}_{Ep}(Q^2)/G^{^4{\rm He}}_{Mp}(Q^2)]/[G^{^1{\rm H}}_{Ep}(Q^2)/G^{^1{\rmH}}_{Mp}(Q^2)]$, extracted by the polarized ($\vec{e}, e' \vec{p}$) scatteringexperiment on $^4$He at JLab, are well described. We also predict that the$Q_0^2$ value satisfying $\mu_pG_{Ep}(Q_0^2)/G_{Mp}(Q_0^2) = 0$ in symmetricnuclear matter, shifts to a smaller value as increasing nuclear matter density,which reflects the facts that the faster falloff of $G_{Ep}(Q^2)$ as increasing$Q^2$ and the increase of the proton mean-square charge radius. Furthermore, wecalculate the neutron EM form factor double ratio in symmetric nuclear matterfor $0.1 < Q^2 < 1.0$ GeV$^2$. The result shows that the neutron double ratiois enhanced relative to that in vacuum, while for the proton it is quenched,and agrees with an existing theoretical prediction.

Study of the in-medium nucleon electromagnetic form factors using a light-front nucleon wave function combined with the quark-meson coupling model