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The influence of dark matter particle decay on the baryon-to-photon ratio hasbeen studied for different cosmological epochs. We consider different parametervalues of dark matter particles such as mass, lifetime, the relative fractionof dark matter particles. It is shown that the modern value of the dark matterdensity $\Omega_{\rm CDM}=0.26$ is enough to lead to variation of thebaryon-to-photon ratio up to $\Delta \eta / \eta \sim 0.01 \div 1$ for decaysof the particles with masses 10 GeV $\div$ 1 TeV. However, such processes canalso be accompanied by emergence of an excessive gamma ray flux. Theobservational data on the diffuse gamma ray background are used to makingconstraints on the dark matter decay models and on the maximum possiblevariation of the baryon-to-photon ratio $\Delta\eta/\eta\lesssim10^{-5}$.Detection of such variation of the baryon density in future cosmologicalexperiments can serve as a powerful means of studying properties of dark matterparticles.

Variation of the baryon-to-photon ratio due to decay of dark matter particles