Thread: What came first matter or dark matter?

So I have my big list of theories, some more mad than others, but the dark matter ones that assume a weakly interacting particles.
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Both created at start of universe
Universe started with matter, antimatter & dark matter. The matter & antimatter annihilated each other leaving a small amount of matter & lots of dark matter.

Dark matter came first
Matter & antimatter got spat out of dark matter quasars in the early universe & then got captured by other nearby dark matter galaxies.

Matter came first
Dark matter is created by black holes etc. etc...

What is dark matter
Single type of weakly interacting particle. Does it strongly or weakly interact with its self?

Dark matter is made of many particle types that interact with each other.
Dark matter molecules etc?

Dark matter structures at larger scale ... dark matter parallel universes.

Why does it not interact?
It does interact but its rest mass / energy is too small to detect.
Some kind of neutrino
Only exists a one fixed energy level that can not be changed.
Is virtual particles associated with photons leaving the galaxies.
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I think I go for the dark matter created at the start of the universe, but multiple particle types.

Anybody like some of the others or has better ideas I should add to my list?

To answer this properly, it would need that dark matter be identified. If DM is some form of conventional matter, it would suggest that all was created at the same time. If DM is necessary to keep structures like galaxies from literally spinning apart, then DM must have been there in the beginning for their formation.

However, since DM reacts gravitationally, then that would suggest that everything from moons to especially black holes would contain DM. Early black holes as in the SMBH's at the centre of galaxies would in fact be mostly DM. A black hole would literally hoover up DM as it moves about through space, or in a galaxy, since all things move.

This does assume that DM exists. There are some theories that have no need for it.

If dark matter only interacts gravitationally, and is composed of particles, then a particle would have to be moving directly towards a black hole to be absorbed, otherwise it would simply horseshoe round the black hole. Black holes are not very large on astronomical scales, so direct hits would be relatively rare.

Originally Posted by Cyberia

To answer this properly, it would need that dark matter be identified. If DM is some form of conventional matter, it would suggest that all was created at the same time.

In the thread: "Science Forum Forum Index » Physics » Balance of electrons & protons"
I am trying out the idea that DM is just electron depleted matter.

If DM is weakly interacting particles then I suggest it will turn out not to be one single particle type, but a family of possibly interacting particles. (One single type of DM particle too is simple for this universe)

Originally Posted by Cyberia

There are some theories that have no need for it.

Yep, looks like if you bend theories of space-time enough & add enough constants to tweek, then DM vanishes in the wash