how matter and visible spectrum emerged from the beginning of the universe?

so we know the famous equation "e=mc2".From this equation we know that energy can be converted to mass.as we know in the start of the universe there was a enormous amount of heat.this heat got changed to matter as from the equation.Now coming to the radiation when the matter and antimatter formed they touched....when they touched enormous amount of energy and 2 photons of gamma rays were released.we know gamma rays have very less wavelength.so when the wave was propagating wave loses some energy.when energy is lost,frequency is also decreasing now when the frequency is decreasing the wavelength is increasing.the wave length got increased to 400nm and thus the visible light emerged.

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