"The Theory of the Boundary of the World?"

Su Yuan asked with a puzzled face.

Charlene walked up to her and said, "The boundary of the world is the concept mentioned by Einstein in his 1905 paper "On the Electrodynamics of Moving Bodies", the world we live in is a three-dimensional space, if we introduce a timeline, it becomes a four-dimensional space-time, and we define the trajectory of particles in four-dimensional space-time as the world-wide boundary. ”

"Since the world realm is made up of countless particles, the world boundary of all particles is combined together, and it is the world boundary of the entire world and the world of the world. In short, the 'history' of the entire world in the timeline is the boundary of the world drawn in the four-dimensional space-time. Moreover, the continuity of time determines that the particles are in a specific position and state at each moment, and the boundary line of the world is a continuous curve. ”

"And because the definition of the world boundary is the set of states of the world on the time axis, that is, 'history', it means that the history of all particles has been given and will never be changed again. ”

……

Gao Jun added: "In other words, whether we can build a time machine or not, it cannot change the history within the boundaries of a world, and if we send a person back in time, his time travel itself is a part of history, and what he did in the past is also everything that should have happened in history." ”

"And what about the grandfather paradox?" asked Su Yuan.

"That's a problem. Gao Jun nodded.

The grandfather paradox, also known as the grandmother paradox, if a person really "goes back in time" and kills his own grandmother before his grandmother conceives his mother, would the time traveler himself still exist? If there is no mother for you, there is no you, without you. How did you "go back in time" and kill your own grandmother before she became pregnant with her mother. This is the "grandmother paradox".

"So we're going to talk about the closure of the boundaries of the world!"

Charlene said in the back.

"The theory of the boundaries of the world that we get from the data. There are still some differences with Einstein's world boundaries. In order to explore the essence of the world, the contemporary physics community has created a total of five superstring theories based on 10-dimensional space and a supergravitational theory based on 11-dimensional space through different evidence. ”

"And the theory of the boundary line of the world that we have obtained from extraterrestrial data seems to be a hybrid model of our native boundary line and theory M. ”

According to the theory of the boundary of the world, the world is the only one. However, it has a myriad of possible branches (the boundaries of the world), each of which performs its own repertoire, forming a unified world in the form of quantum superposition.

"The so-called restraint means that the boundaries of the world lead to a common result. The world will hinder all actions that affect the outcome, and events that are 'outcomes' will definitely happen. This is the end of the boundary between the world and the world. ”

"In a known boundary of the world, history is a fixed and unchanging fact, whether it is to transmit information or return to the past through a time machine, the information transmitted back and the people who return to the past will become the complements of history. Because of its arrival. Only when history is formalized can it truly become 'history' in the eyes of future generations. ”

The so-called closure of the boundary line of the world also represents the immutability of history, everything that happens within the same boundary line of the world. It's all fixed and can't be changed.

Within the theoretical framework of the worldly boundary, the grandfather paradox does not exist. For the traverser must not be able to kill his ancestors. There are several possible speculations for this, either that the person killed by the traverser was not his true ancestor. Either an irresistible external force appeared to stop the traverser's movements.

The malicious actions of the traverser. Perhaps not only did it fail to change history, but it just promoted the course of the original history.

Stephen Hawking had tried to find a new law of physics that forbade time travel. He named it the "Temporal Preservation Conjecture", but he did not succeed, on the contrary, in 2012, other scientists proved that the "Temporal Preservation Conjecture" is beyond the scope of mathematics, that is, the "Temporal Preservation Conjecture" cannot exist, and there is no prohibition of time travel in nature.

****************

"Then if a person travels to the past and time develops, doesn't he travel through the future in the world of the past and the future?"

Isn't that a reciprocating cycle?

Su Yuanhu asked.

Ji Ye Hao glanced at her and shook his head: "This needs to stand in the perspective of the entire World Realm, for the World Realm, at the point in time when he appeared in the past, there was one more person, and at the point in time that 'he' crossed, one person disappeared, that's all." For the timeline of the world, there is not much to dwell on in all this. The timeline exists for the entire world, not because of a trivial matter. ”

Su Yuan nodded suspiciously, and then had another question.

"But since a time machine can't change history, what's the point of building a time machine?"

Charlene said: "Within the same boundary of the world, because history is fixed, no matter how much you cross it, it is to supplement the established history, not to change it. But if you can create a time machine that jumps the boundaries of the world, it will change history in the real sense. ”

"The essence of the world is unique, there are no more than one world, if the world is compared to a stage, the world is the script that directs the development of the characters on the stage. When the traverser jumps from one world to another, he is actually changing the script and going through the process of 'the original world world world is obliterated, turned into a pure energy form, and then collapsed into the new world'. ”

"In quantum theory, the world we live in is in a chaotic state, and the Copenhagen School, which constitutes the main body of quantum theory, believes that when there is an observer in an object in a quantum state, the quantum state will produce a wave packet collapse effect, and the superposition of countless states will change to the state that the observer sees concretely. This is the observer effect in quantum mechanics!"

"It's the same with our world, where all life in the universe acts as group observers, and as a result of their joint observation, the world world has collapsed into what we know as the world world. And the more often it is observed, the more stable our world realm will be!"

In other words, it is not completely impossible to change history, as long as you build a machine that can jump the boundaries of the world and lead the entire world world to another direction of development, then it is equivalent to changing history. ”

……

……

In order to better explain the boundary theory of the world, Xia Linfeng told Su Yuan a story.

It was the plot of a Korean movie: by chance, the heroine living in 1999 inadvertently got in touch with the male protagonist in 1997 through letters, and the two often wrote letters to communicate in the future.

One day, the heroine told the hero that she had a boyfriend, and her boyfriend rarely contacted her again after he went to the United States, and later her boyfriend came back from the United States, but he was already engaged, and the heroine was very sad, so she wrote to the hero, asking him to stop her boyfriend from going abroad.

The heroine wrote to the male protagonist in the world of the world for the α world, and the later result was that the male protagonist really went to prevent the heroine's boyfriend from going abroad, and the heroine didn't know him when he met the heroine two years ago, but he failed to change the history of the heroine's boyfriend going abroad, but died in a car accident because of his own going.

The heroine meets one of the hero's classmates, and learns from the classmate that the hero was in a car accident to prevent her boyfriend from going abroad, and she also remembers the car accident that happened in front of the café two years ago. The male protagonist looked at her from afar before he died.

The heroine learns that her letter to the past does not change history, but rather contributes to the formation of the current history. So he went crazy and wrote another letter, telling the actor not to go to the café.

In the β world, the male protagonist received the last letter, so he obeyed her and did not go to the café, and met the heroine on Christmas Eve in 1999, who had not yet started to write letters, and told her the whole thing......

"In the α century, history has not been changed, and it is still faithfully carried out according to the script of the α century. And in the β World Boundary, the male protagonist listened to the last letter of the female protagonist and did not go to the café, thus changing the history relative to the α World Boundary. ”

"And jumping from the α century to the β world, because the world is the only one, so it first experienced the history of the death of the male protagonist in the α century, after the female protagonist sent the last letter, changing the 'historical information' will erase the history after the male protagonist received the last letter, and the world of the world collapsed again into the plot of the β world at the moment of receiving the letter. ”

"In a narrow sense, the boundary line of the α world is the death of the male protagonist, and the narrow sense of the boundary of the β world is that the male protagonist did not die after receiving the letter, but the β world boundary line clearly received a letter from the heroine of the α century, indicating that the entire world of the world first experienced the boundary of the α century, and then developed into the boundary line of the β century, in a broad sense, the boundary of the β century actually includes the history of the boundary of the α century that has been erased. ”

"Ah, I kind of understand when I say that!"

Su Yuan clapped his palms and suddenly realized.

Gao Jun said: "So the time machine we want to build is a machine that can jump the boundary between the world and the world like the last letter. ”

"But how do we know if the time machine created by Lu Dao has jumped the boundary of the world, if it is like the heroine's previous letters, they are all sent in the same world boundary, isn't it meaningless?"

Charlene nodded, "So before that, we must build a machine that can detect which world boundary line the world is in, and only when this kind of machine is built, can we understand whether the world world boundary has changed." We named it the 'World Boundary Olfactory Device'. ”

……

……

The World Realm: Uniqueness.

The boundary of the world: the trajectory of the world in the four-dimensional space-time, that is, a single fixed history.

A time machine that jumps the boundaries of the world: A machine that makes the world and the world "obliterate and collapse" from one world boundary into another.

Su Yuan was in a daze, moved a stool and sat at the door of the laboratory, quietly looking up at the sky under the setting sun. (To be continued......)