Reseachers found missing fermionic (or baryonic) matter.

"Caption:Simulated gas distribution (blue, green, and yellow colors) around galaxies (white dots on the image). The study finds that gas in our Universe extends farther from galaxies than most simulations predict, indicating strong activity from galaxies that have expelled gas away from galaxy groups.Credit: IllustrisTNG" (MIT News, Diffuse puffs of “missing” matter surround most galaxies)

Reseachers found missing fermionic (or baryonic) matter. And could that be the route to finding the source of dark energy?

Could the extremely cold material cloud outside the universe be the reason for the universe’s expansion? If there is an extremely cold material cloud in space. Its energy minimum is lower than that in the observable universe. That makes that matter invisible. That means that. The dark energy. That expands the universe. It could be the virtual effect. Caused by the hypothetical “universal Oort Cloud” of the fermionic material outside the visible universe. Here I write fermionic. The reason for that is that matter must not be in protons and neutrons. Those particles are baryons. And atoms are baryonic objects. But. Those hypothetical clouds. They can be free quarks or some other fermions like low-energy electrons. So here I use fermionic instead of baryonic.

"The spatial distribution of fast radio burst signal across the sky (above), compared against the galaxy distributions (below). The study has found a significant correlation between the two distributions, revealing missing baryonic matter in the Universe.Credit: Haochen Wang" (MIT News, Diffuse puffs of “missing” matter surround most galaxies)

Reseachers found missing fermionic matter in space between galaxies and galaxy clusters. This means this. There could be lots of matter in the universe. We cannot see it because we are in our solar system and galaxy. The temperature in our solar system is higher than outside the partially hypothetical Oort Cloud and the Kuiper belt. This makes it hard to detect weak IR objects outside the heliopause. The small dwarf planets and asteroids outside Pluto’s orbit are confirmed. 

Most of those objects are maybe metric or centimeter class. The diameter of the Oort Cloud is a mystery. But many times. When people talk about the Kuiper belt and Oort Cloud, they mean the same thing. The asteroid and dust cloud around the solar system. The size of that cloud is enormous. And that means that it causes scattering effects. That makes it hard to get an IR signature from objects that are behind it. The warmer objects cover those colder objects behind them. Even if the temperature difference between those objects is less than a degree. Energy travels to a lower-energy area. 

Kuiper belt and Oort Cloud. Could. This kind of structure? But on a larger scale. Surround the entire universe? If the ultimate large-scale version of matter cloud surrounds the universe. That thing could cause a gravitational effect that expands the universe. We could see this kind of material structure and its interaction as dark energy. If. Energy travels only to that cloud. That makes it invisible. If the energy level of reflection is lower. 

Same way. The temperature in our galaxy, along with brightness, is higher than outside it. This means that the Oort Cloud and matter in our galaxy extend beyond our galaxy. Matter in our galaxy and in our solar system shines brighter.  Than matter outside it. The reason for that is the scattering of light from our Sun and billions of other stars. We can compare this situation with cases where we drive a car in a snowstorm. When we turn on our headlights, we can see only the snow. The reason for that is reflection from the snowflakes. This means inside the universe and outside it. Could be a similar effect. 

Then the energy level in the universe is. There can be lots of matter that we cannot see, because it's so cold.  Here I mean fermionic matter. And the shine of other material covers it under its IR brightness. And of course. Dark matter is one of the mysteries. 

“The filament is made up of hot intergalactic gas (shown in mottled black-yellow), a type of ‘ordinary matter’ that has proven really difficult for astronomers to find.” (ESA)

There is a possibility that the temperature outside the universe could be below the energy minimum inside the universe. This means that energy moves out from the universe. And if there is no such high-energy reflection, it can travel back into the universe. That can cause a situation where we cannot see that matter. For sending. A reflection that can penetrate the universe. The reflecting particle. It must have such a high energy level. That the energy in that reflection. Is higher than the energy level in the universe. 

But reseachers found missing matter outside the galaxies. And outside the galaxy clusters. This means that high-energy reactions. They can throw matter out from the galaxy clusters. This causes. An idea.  That maybe there is lots of matter that is even harder to detect. But the Kuiper belt and Oort Cloud. They can be used as a base for conclusions. 

When the diameter of the galaxies is about 100 million light-years. The diameter. The missing material cloud is about 4-5 billion light-years. So could there be a large material cloud outside the visible universe? That material cloud of extremely low-energy matter could pull the universe outward. So, could that kind of material cloud explain dark energy as a virtual effect? The reason for the virtual effect could be extremely low-energy material outside the visible universe. 

https://www.esa.int/Science_Exploration/Space_Science/XMM-Newton/The_models_were_right_astronomers_find_missing_matter

https://www.livescience.com/space/astronomy/much-more-violent-than-predicted-a-chunk-of-the-universes-missing-matter-was-powerfully-hurled-out-of-galaxies

https://news.mit.edu/2026/missing-matter-diffuse-puffs-surround-most-galaxies-0721

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

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

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

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