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Why does Cosmic Microwave background is a proof for Dark Matter? Why the neutrinos were considered...

Why does Cosmic Microwave background is a proof for Dark Matter? Why the neutrinos were considered in a moment being candidates for DM particles?

I need a very detailed an explanation including all the physical considerations.

thank you!

Solutions

Expert Solution

you can check from the observation of planck there is CMB distribution.

In the plot, you find that there are a lot of anisotropies or so much clumps, that clumps are due to dark matter. If we consider just the neutral hydrogen then the distribution will be just uniform, there must not be any clumpiness but when you include the dark matter. Since dark matter is cool matter, Due to this dark matter the neutral hydrogen feel so much gravitational force which cause so much clumpiness in the planck spectrum of cosmic microwave background.

NO one knows about the nature of dark matter. We now know that the deficit of neutrinos is due to their oscillation, but at the time, there was an arguement that dark matter could be made up of a new type of particle, possibly not included in the Standard Model. Heavy neutrinos were once considered a candidate for particle dark matter , but large-scale structure simulations of neutrino dark matter have ruled them out.

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