There is the theory. That dark matter or missing baryons are simply "too hot".

That theory conducted from the photons are extremely high-energy particles. That means photon hover in their shine or high energy quantum field. And because a photon sends radiation all around it, its mass is really hard to measure. And there is an even more interesting model about the material and its form. 

The idea is that. As an example, all bosons are one particle. And the thing that determines is particle gluon or W and Z boson or photon is their energy level. That thing opens new visions for the material. When the energy level of particle increases, it turns smaller and smaller. The reason for that is this. The shine of particles turns brighter and brighter. So when a particle sends radiation or wave movement, it acts like some futuristic spacecraft. That hovers in the wave movement. 

So dark matter is material that has so a high energy level that it cannot interact. Or interaction is one-way. Baryons are not elementary particles. But they behave like elementary particles. If the energy level of the baryon is extremely high and it spins at a very fast speed. That means that the baryon looks like an extremely fast-spinning star. That baryon like all other particles sends radiation around it. 

A long time researchers thought. Baryons, protons, and neutrons consist of three quarks. The structure of a proton is much more complicated than three quarks. There are also things like charm quarks in protons. The energy level of those particles is higher than the proton itself. And that thing means that there is the possibility that charm quark determines is the baryon visible or not. Two up and one-down quarks are mainly forming protons. And two down and one up quarks mainly forming neutrons. 

In a hypothetical "top neutron" the top quark replaces the up quark. And then the form of that thing is the one top quark and two down quarks or any other quarks like bottom quark. 

A hypothetical top proton is a proton where two up quarks and one top quark form a "proton". In the place of "up quarks" could be any other quark. 

So the "cold" dark matter can be: 

In that model, bottom quarks can form similar particles like up and down quarks. The "top or "super neutron" could be two up quarks and one bottom quark. Or "super proton" can consists of two bottoms and one up quark. 

And hot dark matter could be: 

If we continue this chain the bottom quark can make top hadrons. In that case, the more high-energy form of a proton could be two charm quarks and one bottom quark. And the neutron version of that "super proton" could be formed there is one charm and two bottom quarks. 

And the top version could be two charms- and one top quark. The other version would be one top and two charm quarks. In this version is followed the route of interactions. And 99'8% of decays of the top quark happen with the bottom quark. Other possibilities are strange quark and down quark. 

But there are also other quarks than only up and down quarks. Same as in leptons where also other leptons than electrons should form orbitals the other quarks that just up and down quarks should form baryons. But nobody has seen either atom where muons replaced electrons. 

And also there is no baryon there top quark makes that structure with two up quarks. But there is a charm quark in the proton. And that means that also quarks can play a bigger role in the material than we can even imagine. 

That quantum spiral pushes radiation away from those baryons. The same way the quantum tornado on that hadron's poles pulls incoming radiation into one direction. In that model, the extremely fast-spinning hadron can interact with its environment like a black hole. But that interaction is far weaker.

https://bigthink.com/starts-with-a-bang/missing-baryons-too-hot/ 

https://en.wikipedia.org/wiki/Top_quark

https://en.wikipedia.org/wiki/Strange_quark

https://en.wikipedia.org/wiki/Down_quark

https://en.wikipedia.org/wiki/Charm_quark

https://en.wikipedia.org/wiki/Up_quark