Let's start with a well-known "grandmother's paradox".
It is to the effect that if we go back in time through a time tunnel and meet our grandmother, and we unfortunately kill our grandmother, then since my grandmother died when she was young, where did I come from in the future, since there is no me, how can I go back in time and kill my grandmother, which creates a paradox.
This paradox is based on Einstein's general theory of relativity.
General relativity holds that our universe is parallel and interconnected, and can go back in time through holes.
As conceived, if a return to the past is true, the paradox described above will inevitably arise.
In Einstein's special theory of relativity, we are again told that time and space are interconnected, and since the speed of light is constant, all motion, even time itself, must correspond to it, and thus time is also relative.
Therefore, in order to explain the above paradox, people put forward the concept of "parallel universe", which is Hawking's "parallel space theory".
Hawking explained that when time travelers go back in time and change history, the timeline is divided, and the timeline of the split unfolds into another history.
However, if we can go back in time, we can break the law of cause and effect.
Therefore, the grandmother's paradox is also explained in this way: because time is related to space, my grandmother is killed, and the world is divided into two due to the change of history, resulting in the branching of time and space, so that I do not exist in this space, but the grandmother in another space still exists, and I still exist.
Since the theory of human beings returning to the past is established, "time machine" and "time travel" have become widely used themes in science fiction works.
"Time machine" first appeared in Wells's novel Time Machine in 1895, when the idea was just the author's fantasy, until the special theory of relativity and general relativity came out one after another, and this idea began to have a certain physical basis, and science fiction movies with similar themes also had a scientific basis.
It is precisely because of science that there is an intriguing story between science and fantasy.
For example, in the science fiction comedy Back to the Future, the protagonists Martin and Brownbo travel between the past and the future on a time machine, and interact with the people of that time and space, thus causing the branching of time and space and creating a different ending from the original time and space.
In this film, the director vividly shows the causal relationship caused by the branching of the world due to historical changes, which makes this series of films a classic.
This kind of parallel universe that has changed history due to time travel and a new parallel world is called "posterior parallel universe".
The most typical example is in the cosmic pursuit order, the parallel universe where Jet Li is located is called the pre-set parallel universe, which means that whether you play time and space shift or not, an infinite number of universes originally existed, and you can run around in it if you have the ability.
This is akin to nonsense, but experts say that imagination in science fiction movies cannot be treated as nonsense, because even if some of these imaginations have no scientific basis, they can influence science by expanding people's imaginations.
If we go a little further, the world created by the Cosmic Pursuit Order can involve the content of quantum physics.
There is a famous electronic double slit experiment, where an electron passes through the slit and appears on the screen at a deflected angle instead of a straight projection of the slit.
When a large number of electrons accumulate, interference fringes are generated, and these electrons pass through two slits at the same time as if they were doppelgangers, resulting in interference.
However, if we have a detector in each of the gaps, the electrons will only choose one of the slits to pass through, and there will be no interference.
How to explain this strange phenomenon, physicists have also proposed the theory of "parallel universes".
They believe that the electron still passes through two seams at the same time, but in our universe he passes through one of them, and in the other universe he passes through the other, thus making up for the missing state in this world.
Most likely, parallel universes existed in the first place, but we can't confirm it from experiments at this time.
Then, in the case of the "grandmother's paradox", it can also be said that the universe has an infinite number of parallel spaces, and thus an infinite number of parallel times can be generated.
Even if we had killed my grandmother, I would not have existed on this plane, and my grandmother on another plane would still exist, so I would still exist.
According to this, there is no such thing as "front" and "back" in parallel universes, and all matter is in motion and differentiating, as small as a particle, all the time, it is divided, and the world has been dividing.
For example, walking, I am walking on the road, there may be two roads in front of me at any time, I am thinking about whether to choose to go left or choose to go right, so the world is divided into two in my choice, one I go to the left, the other I go to the right, this differentiation determines the possible fate of my world, I choose to go to the left, I may meet a beggar in the next second, so the world begins to divide again, and I have to decide whether I need charity; On the right, I might meet a young lady and have the opportunity to walk with her.
Isn't it amazing, fate has a different outcome due to choice.
When we think of causality, we think of the "butterfly effect".
Quoting an explanation on the Internet, "A butterfly in the Amazon basin of South America, with a few occasional flapping of its wings, may cause a tornado in Texas, USA."
The reason for this is that the movement of the butterfly's wings causes changes in the air system around it, and causes the generation of weak air currents, which in turn cause corresponding changes in the air or other systems around it, which causes chain reactions, and eventually leads to great changes in other systems.
"To put it in dialectics: things are universally connected.
If we trace the origin of the universe to a Big Bang, then the kinetic energy, direction, speed, etc. of the Big Bang at that moment determine everything that happens after that, and perhaps also determine the birth and death of you and me However, nothing is a definite number, because there are also uncertainties in quantum physics.
For example, if an electron hits a proton, it may turn to the left or to the right, because this uncertainty cannot be grasped, so the two possibilities of the electron turning to the left or turning to the right form two parallel cosmic worlds.
If we explain the current universe in terms of Planck's constant, it is easier for us to argue for the possibility of parallel universes.
The so-called Planck constant is the most basic unit of energy representation.
On the planet where we exist, every matter has a small and indisectible unit, we usually use atoms to represent this smallest unit, similarly, every matter has energy, some have large energy, some have small energy, then energy should also have a minimum unit, physics calls this most basic unit of energy Planck's constant.
The energy contained in any matter is an integer multiple of Planck's constant, but this is limited to the world in which we exist.
If we extend this law indefinitely, there will inevitably be a world in which Planck's constant is not what we know.
For example, if the value of Planck's constant in another world is "2", then the other world is based on Planck's constant of "2".
There are an infinite number of desirable values between 1 and 2, so the worlds that can exist in parallel should be endless.
But why can't we see them, why can't we feel them, if the positions overlap, we meet them and can't see each other, will we bump into each other?
The most direct example of the relationship between the two is odd vs. even.
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There is no intersection between odd and even numbers, and they will always exist in parallel, so when they meet, they will pass through each other's queue without hindrance, that is, it is impossible to perceive each other, let alone collide.
In the same way, two worlds with different Planck constants are like a row of odd numbers and a row of even numbers, which are the smallest units of energy, and the difference divides us into two spaces, and it is impossible to perceive each other, let alone collide.
Although theoretically such a space-time can generate an infinite number of values, it is not possible to extract multiple values from them in the same way that odd and even numbers can be derived.
By solving Planck's constant equations, scientists can only arrive at a few plausible solutions to the equation, from which several possible parallel spaces can be constructed.
However, under the influence of uncertainties in quantum physics, these parallel spaces may also be unstable, and if the parallel spaces composed of these uncertain Planck constants are formed, there is a possibility of extinction
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