Multiverse, again and again.

The history of the multiverse theory is interesting. When our knowledge of the universe increases we must accept more and more things that we thought is impossible. At first, we thought that the Earth was the center of the universe. 

Then we realized that Earth was just one of the planets. Then we thought that our home galaxy was the "Milky Way". If the center of the universe. Then researchers found other galaxies. Then they found galactic clusters and the cosmic web which is the largest known structure. 

Once said that there are no other solar systems. And now we know thousands of planetary systems. The last thing that is not yet officially found is the anther intelligent species. And the other thing is that other universes are waiting for their finders. 

There is no evidence about the existence of the multiverse. But otherwise, there is no evidence that the universe where we live is unique. Or, we can say, the universe where we live can be unique even if there are other universes. And the reason for that is that we are living in this universe. Nobody has seen other universes but logically thinking, there should be more than one universe. But there is the possibility that those other universes are far different than "our" universe. 

When we talk about multiverse theory, we must realize that there is no way to prove or disprove that theory. We cannot see other universes because the light pollution from galaxies covers radiation that comes from those other universes. So the theory of multiverse base is in the Big Bang theory. The key element in multiverse theory is that there should be more than one Big Bang in spacetime that we call as "third dimension". 

Above: Are other hypothetical universes dark to us? That means if they formed in similar Big Bangs with our universe but the energy level of those Big Bangs were different. The elementary particle's size in those other universes would be different. 

That means they are sending radiation that has a different frequency than radiation in our universe. Another reason why we cannot see other universes is that radiation that comes from our universe just pushes the radiation from other universes away. And that means radiation from other universes cannot reach us. 

The multiverse explains the radiation source that could form material in the Schwinger effect. If the Big Bang was some kind of singularity there must be some other source for the crossing wave movement. When we say that the Big Bang was some kind of destruction of singularity, we don't mean that the "singularity" is the same as some supermassive black hole. 

During the Big Bang, all material and radiation were released into spacetime. And that means that "singularity" would be far more than some black hole. In some models, the superstrings started to turn to extreme singularity, but the problem is again: where those superstrings came from? Energy can turn to material and material can turn to energy. So that means there must be some source for that energy. 

And then we must realize one thing. Those other universes might be very hard to detect. And the reason for that is the Big Bang. The Big Bang was an event where the material was released into space and time. Otherwise, that means the Big Bang was the event. Where material reached a certain energy level. If we say that thing by using other words: we can say that material or elementary particles reached a certain size. 

So if the energy level in some other Big Bang was different another universe has different sizes in elementary particles even if they seem the same as elementary particles in our universe. And that makes it very hard to see that another universe. Another thing is that the other universes are sending counter radiation as well as our "own" universe sends radiation. 

That radiation pushes the weak radiation from its direction. That means radiation that comes from other universes will never reach our universe. Another problem with the detection of another universe is that there is an absolute zero energy level in the space between universes. So all radiation that travels between our and other theoretical universes has the same frequency.

 And that means stronger radiation that comes from our universe will not let that weak radiation come into our universe. So that's why the multiverse theory is very hard to prove. But logically thinking, it's a wonder if there are no other universes with galaxies and planets. I think that our universe is one of the many universes. And maybe the universes are forming the chains and mega-hyper structures in space.

 

https://www.forbes.com/sites/startswithabang/2021/02/25/why-do-physicists-say-a-multiverse-has-to-exist/

https://www.livescience.com/multiverse

https://scitechdaily.com/the-mind-bending-multiverse-our-universe-is-suspiciously-unlikely-to-exist-unless-it-is-one-of-many/