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The ratios of the baryon electric ($G_E$) to magnetic ($G_M$) form factors,$G_E/G_M$, can provide us with important information on the structure ofbaryons in vacuum as demonstrated in recent studies for the proton and neutronsystems. It has been argued that the corresponding in-medium ratios,$G_E^\ast/G_M^\ast$, can also provide useful information on the electromagneticstructure of baryons in a nuclear medium. Although the ratios may not bemeasured directly in experiments except for the proton at present, the doubleratios $(G_E^\ast/G_M^\ast)/(G_E/G_M)$ can be directly related to thepolarization-transfer measurements of bound baryons. In the present work weestimate, for the first time, the double ratios $(G_E^\ast/G_M^\ast)/(G_E/G_M)$for all the members of octet baryons in symmetric nuclear matter in the range$Q^2=0$--3 GeV$^2$, where $Q^2=- q^2$ with $q$ being the four-momentumtransfer.

Octet baryon electromagnetic form factor double ratios $(G_E^\ast/G_M^\ast)/(G_E/G_M)$ in a nuclear medium