Is there an outside to the universe?

I've had a few people asking me to recommend some interesting books, so I'd like to introduce some to you.
As always, it's a space book first.
Recently, Hitoshi Murayama's book, which is rare in this field,
"What is the universe made of?"
became a best seller.
I can easily imagine the constellations and the things I learned in high school science.
I have little interest in creating things, but modern physics
For something that is not even understood by astronomy
There's a much greater interest in that.
Thanks to Mr. Murayama, dark matter is becoming a common term.
Dark energy, these two things whose true nature is still unknown
It makes up more than 90% of the components of the universe.
When we look at the recent evolution of the Internet, including the iPhone, science
I think many people feel like they have reached the limit.
In fact, we still don't know more than 9% of the world!
And both have been definitively proven correct.
The theory of relativity describes the world of the infinitesimal, and quantum mechanics describes the world of the infinitesimal.
These two statements are contradictory.
The Big Bang, which is both the largest and the smallest, was a single point in the infinitesimal universe.
I can't explain it.
The leading theory that can explain this contradiction without any contradictions is called superstring theory.
This is a theory, but it requires 11 dimensions for it to work.
At this point in time, we can't even imagine the fifth period, let alone the eleventh.
Even though it's in that state...
This theory suggests that the universe is a multiverse, meaning there are many universes in existence.
Or that parallel universes (universes that are happening at the same time but are slightly different from the one we live in) exist.
This is not occult, but is being seriously debated among the world's leading physicists.
I'm extremely interested in these things, and I want to write a book about them for the general public.
I have read almost all of the books that explain things in an easy to understand way.
Among them, the one I'm introducing today is the one that is very easy to understand despite being thin.
"Is there an outside to the universe?"
I found the section on quantum mechanics particularly interesting.
I will omit quite a bit.
"The universe is essentially multi-worldly, and human consciousness can only see one of these worlds.
In that sense, rather than saying that there are many universes,
If the universe is truly complex and mysterious, we can only see a limited part of it.
That might be better."
Or,
"For some reason, the universe is too well-suited for life to flourish."
(In this book, such probabilities are often expressed as 10 in 10 trillion trillion or 1 trillion.)
It is too much to even consider such an impossible probability as mysterious.
But,
"This universe is not the only one, but out of the countless universes, this one just so happens to be the one that gives birth to intelligent life.
If it was the universe, it makes perfect sense."
It also says:
I don't think all of these problems will be solved even before I die.
However, the current situation regarding the accelerator that has been in operation in Switzerland since 2008 is
Research is being conducted with huge funding.
Just the other day, it was announced that there is a 98% probability that a particle called the Higgs boson, also known as the God particle, exists.
It has just been detected. (However, in the world of theoretical physics, it is necessary to have 99.9999% accuracy.
It is so strict that it is not recognized yet.)
Also, it is possible that some clues regarding the fifth dimension alone may be discovered within a few years.
It is said that the Earth is very hot. When Einstein proposed the theory of relativity,
I feel the same excitement as if I were witnessing a world I had never imagined before.
I hope to experience it a few more times in the future.