Dark Energy & Light: The Mystery

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Dark energy and dark matter make up approximately 75% of the universe's energy, but they are distinct from electromagnetic radiation. The cosmic microwave background (CMB) measurements indicate that electromagnetic radiation constitutes only about 10^-5 of the universe's density. There is no feasible mechanism to generate the vast amounts of radiation needed to match dark energy levels. Additionally, dark energy contributes to the acceleration of the universe's expansion, while radiation would have the opposite effect, decelerating it. Therefore, dark energy cannot be equated with electromagnetic radiation from the Big Bang.
ravisastry
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Hi,

these days. I am reading a lot about dark matter and energy in news papers. i came to know that dark energy/matter constitutes almost 75% of energy of universe ? can it be possible tat, this dark energy is the same as electromagnetic radiation emitted in this universe since big bang ?
 
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Nope.

We know very well how much electromagnetic radiation is the universe by measuring the temperature of the CMB. It is about 10^-5 of the density of the universe. There is no plausible mechanism whatsoever to create 100,000 times more radiation. Furthermore, the dark energy acts completely different than radiation. Dark energy accelerates expansion, whereas radiation would decelerate it.
 

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