Elaine saw that Hawking's breathing was improving, and after asking and answering questions with Huang Ji, she stood silently aside and didn't dare to interject, or even dare to breathe.

She doesn't know what to change history or create it.

Elaine only knew that she must be witnessing history.

Hawking pondered for a moment, not understanding the meaning of Huang Ji's words, history cannot be changed, only created?

I still can't believe it, but when I saw that invitation, I felt like the world I had understood all my life was collapsing. ”

Huang Ji was noncommittal and did not speak.

Hawking said: "I will not send an invitation, I can tell you very firmly, I will not send an invitation!"

"Please don't say that you will send out the invitation in my place, you should understand that I am asking a question equivalent to the grandmother's paradox, please tell me why you are able to come to my party?"

Huang Ji picked up another orange to eat, and said with a smile: "Professor Hawking, as a scientist, you should understand that paradoxes will not really happen. ”

"When you think of a thing as a paradox, there must be some kind of misunderstanding here. ”

Hawking asked, "Please tell me, what is the misunderstanding, since you have come to my party, you must be willing to satisfy my curiosity, right?"

Huang Ji said: "Of course, Professor, I will also gain something from you. ”

"Okay. Hawking agreed without hesitation.

He didn't care what Huang Ji needed, even if it was life, he had already been sentenced to death by the doctor, and it was his curiosity about the universe that drove him to live to this day.

Huang Ji said: "If A goes back in time and kills his maternal grandmother before his mother is born, people take it for granted that this action will cause a contradiction, resulting in A not being born, and therefore not traveling through time and space to kill his grandmother." ”

This is the grandmother's paradox proposed by Hernet, which is widely circulated and very classic, and it also represents a certain kind of human arrogance about time. ”

"In the story of the grandmother's paradox, the premise that 'A is a person whose grandmother was born normally without being killed' is forcibly set up, and at the beginning of the logic, people are implanted with the history of 'grandmother is alive', which is obviously assumed. ”

"After arranging a 'normal history' first, a history of time travel to kill my grandmother was postulated, creating a B history. ”

"After that, this story, which puts history A and history B together, and compares it as a 'simultaneous' event, which is contradictory. Isn't that nonsense?"

"Alexander's conquest of Egypt is a kind of history, and his failure to conquer Egypt is also a possibility of history. The two histories are naturally contradictory, as long as they go on at the same time. ”

"The whole paradox, that one person has participated in two histories in succession, but misleads people into thinking that 'it should happen at the same time' is stealing the concept. ”

This is a typical logical error, a paradox created by man. ”

Hawking tilted his neck and said: "This is a thought experiment, of course there is a hypothetical premise, this person travels to the past, participates in the history of the past, and of course belongs to both histories at the same time." ”

Huang Ji said: "This is a misunderstanding. Professor Stephen Hawking. ”

"The reason why the concept is changed without making people feel out of harmony is because there is a 'time travel' setting in the middle. ”

"People don't really know anything about going back in time, so you instinctively think it's reasonable to be involved in both histories. ”

Seeing that Hawking hadn't figured it out yet, Huang Ji smiled and said: "When a phenomenon happens, there must be a reason." When one thinks that something is a paradox, it must be that something in it has been misunderstood. ”

Hawking agrees that this is the cornerstone of science.

One thing is a paradox, either a concept is not added, or one of the concepts is wrong.

So there are two main explanations for the grandmother's paradox, one is Hawking's time-series protection conjecture: time travel is not allowed at all.

The second is the famous parallel world theory, when a person travels through the moment, he enters a completely new world, and it is not his own maternal grandmother who kills, but the maternal grandmother of the exact 'other self'.

"So...... You mean parallel worlds? You're already standing in front of me without paradoxes, so you're coming from another parallel universe? Am I wrong......" Hawking said.

He does not support parallel worlds, and argues that time travel does not exist in order to preserve the paradox from happening.

Now that Huang Ji was standing in front of him, he could only think that Huang Ji was from a parallel world.

Unexpectedly, Huang Ji shook his head and said, "No, in fact, you are right, your theory is closer to the truth, Professor Hawking." Time travel doesn't split into parallel worlds. ”

Hawking's eyes twitched, and he was greatly surprised.

What? Not parallel world theory? Temporal preservation is closer to the truth?

How is it possible? In other words, the time traveler is traveling through the past of his own world? Isn't this still a matter of facing the grandmother's paradox?

Huang Ji explained: "The grandmother's paradox is based on the false premise that time travelers can enter the past history...... Back to the original history. ”

This is the biggest misconception of people: time is space. ”

"People can't perceive time, as if they can't perceive a higher dimension, so they can only make analogies and guess what it looks like. ”

"Because people can move forward and backward in space, it is assumed that once they have mastered time, they should be able to move forward and backward in time. ”

"This has led everyone to understand time as a road, and time travel as a return to the past and back to the beginning. ”

"In the end, I was depressed and contrasted with the contradiction between 'the world before I changed' and the 'world after the change'. Isn't that nonsense?"

Hawking said: "You mean, once you go back in time, you can't go back?"

"What about the original world?"

Huang Ji smiled: "Look, you are imagining the original world again. ”

"The reason why people feel paradoxical is because they forcibly join a world that 'doesn't exist'. ”

"Time is misunderstood, and it should not be compared to space, but to light. ”

"Light ...... When it's reflected back, do you think the light is flowing backwards? It's just going in a different direction. ”

Hawking was silent, and then asked, "So what is the essence of time?"

Huang Ji said: "The essence of time, you can imagine it as a substance. ”

"It is not that everything moves forward in time, but that time is born one by one on everything. Time is not space, it is not a road. ”

"Time also has the nature of particles, and one by one, like a quantum of light, is absorbed by all things. This absorption itself is not time-consuming, but is actually an intrinsic property of matter. ”

"It's like a quantum fluctuation, it appears instantaneously and is consumed in an instant. ”

"Everything includes space, they absorb time, they can change themselves, and they can only absorb, not emit, just like entropy increases, it has only one direction. The 'time entropy' that has been consumed will only increase, not decrease. ”

"If the substance has no reabsorption time, it will be still. Time is a kind of 'fuel', but it's just 'the energy that drives things to change'. ”

"Energy is only a condition that drives the change of matter, light has energy, and without time, everything will not change, space will not expand, energy will be still, and the world that will not change is meaningless. ”

"The more time something absorbs, the faster it changes. Otherwise, the slower the time. This is mass dependent, and the larger the space warp, the lower the rate of absorption time. The most efficient is undoubtedly the rate at which a zero-mass object absorbs time in a vacuum. ”

Elaine listened to the clouds and mountains on the side, and her little face was confused.

Hawking was stunned, Huang Ji directly regarded time as matter, as energy, and space as matter, and finally unified them together, and put forward the concept of time entropy, which conformed to reality while preserving the second law of thermodynamics.

The theory of relativity and quantum mechanics are two edifices of human physics, but they are incompatible with each other, and the biggest contradiction is the understanding of time and space.

There has been a search for theories that unify them, and then something like string theory has emerged, and high-dimensional conjectures have to be added.

But the Yellow Pole takes a different path, it directly treats time as a matter like quantum fluctuations, born one by one, it has no mass, and it is not subject to force, so it is unobservable.

The only proof of its existence is the slow time of massive objects.

Huang Ji combines the theory of relativity and quantum mechanics.

"It's amazing, can you prove it? Can you deduce it mathematically?" said Hawking, wistfully.

However, Huang Ji said calmly: "I'm sorry, Professor Hawking, the proof process is too big to write here!"

“#￥##...... ¥#!" Hawking had a language barrier again, and he couldn't utter a word for a long time.

He knew that this was not only a matter of not being able to write down, but that his limited life would probably be difficult to read through the grand unified model of the universe.

"So the essence of time travel is not to cross over to the past in the timeline, but to ...... Stephen Hawking slowly calmed down, and immediately deduced the time rewind method based on Huang Ji's theory.

Huang Ji said: "Yes, this is a theoretical way to go back in time. Just as life is a low-entropy body and can emit entropy in the body, this is actually exacerbating the entropy increase of the universe as a whole. ”

"It's the same with the timing of discharge. Normally, it cannot be discharged, but theoretically it is possible to achieve 'time emissions' with technology, and one emission will lead to the other's responsibility. Emission time itself also consumes time, and the total amount of time in the universe is finite, so it will eventually lead to ...... 'time silence' and the entropy of time will increase to the limit. ”

Hawking exclaimed: "Time is ...... Is it limited?"

Huang Ji said: "The biggest misunderstanding of time lies in this, the total amount of time is limited, which is cruel, but it is true. ”

"The total amount of matter in the universe is finite, energy is finite, space is finite, why is time infinite?"

"Physicists strive to unify time, space, energy, and matter, and they all treat them as 'the same thing', and they are essentially the same thing. ”

Hawking was silent, if the theory of grand unification is to be established, then these four things are actually different manifestations of the same thing.

Huang Ji continued: "Absorption and emissions are consuming time, and emissions are consuming twice as much. So Dr. Hawking, your theory is correct, 'time is irreversible', but the universe can go back to its past state, which is not a contradiction. ”

"If an object stops absorbing time, then it will stand still in time, and no matter how you attack it, it will not have any physical reaction or chemical change with it. No, you can't even see it! because it doesn't emit light, it doesn't participate in electromagnetic interactions. ”

"In the universe, it doesn't even know it exists except for fixing the original distorted space-time, that is, the gravitational field. ”

"If it accelerates absorption, then it accelerates in time. Shroud the entire Earth in a time-accelerating field, and you'll see the Earth ...... rapidly developing."

"On the contrary, if a person wants to rejuvenate, it is good to discharge his own time, and the position and state of matter will be reversed. ”

"If you want to go back to a bygone era, you can drain the entire space and all the material in it. ”

Hawking understood, and in this way, the grandmother paradox was not contradictory.

Suppose A emitted all the matter in the universe in time, say fifty years, then he goes back fifty years ago.

He killed his maternal grandmother, but that didn't cause him to disappear, because he had already 'killed' his own mother when he had turned back time, erasing everything that had been born in the past fifty years, and reverting all particles back to their former state.

A goes back to 50 years ago, belongs to the 'island in the long river of time', and can no longer go back to 50 years later, time is irreversible, history is history, and the past is the past.

He just let everything, change direction, start all over again.

"Going back in time does not change history, but creates ......history," Hawking remembered what Huang Ji said at the beginning.

This conjecture is astonishing...... No, it's not conjecture, the other party is a time traveler, what he said is ...... Fact?

"You irreversibly rewind the time of the universe in order to come back to see me?" Hawking said in horror.

Huang Ji smiled: "It has nothing to do with you. ”

Hawking is not surprised, the other party can't change the world just for him, there must be other reasons, seeing that he is incidental.

This is unimaginable technology! How much damage does this do to the universe?

The most terrifying thing is that the people who are in it will not know that time has been turned back, let alone find any traces.

"Unbelievable, how many years has the universe gone backwards? Will humans already rule the entire universe in the future? How many years has this been a terrifying technology that has been developed?" Hawking was completely confused.

Unexpectedly, Huang Ji said: "This has nothing to do with human beings. ”

Stephen Hawking was stunned, it has nothing to do with human beings? What does this mean?

Huang Ji's next sentence made him and Elaine completely stunned.

"Professor Hawking, I never said that...... I am human. ”

......