reverse travel

Among all the propositions about time and space travel, there is a problem that is difficult to avoid, that is, the ancestor paradox (*).

After a person travels back to the past, if he accidentally kills his ancestors, then the future him cannot exist.

If he didn't exist, then the two things of "traveling back" and "killing the ancestors" would not be possible.

This is a knot that cannot be untied, a fixed link, and it is also the reason why Chen Shiyi was questioned by the scientific community immediately after the successful development.This is the butterfly effect caused by the law of causality: everything that happens causes something else to happen.A person who can jump in space changes the fixed time flow law, then this change will definitely cause certain things to happen.

How can a person who uses Chen Shiyi to make a space transition guarantee that he will not change history?What if it is used by someone with a heart to disrupt the normal order of history?

During the development of Chen Shiyi, this was also an important problem faced by Chen Zhenghe's team.

After the successful development of Chen Shiyi, an experimental space transition was carried out. The time and place of the transition were a week before the day of the experiment.

The researchers who participated in the experiment were shocked to find that they could not touch anything from a week ago.A person who travels back to the past is like an alien on the timeline. He cannot integrate into time, so he cannot touch anything on the timeline.

Chen Zhenghe's team immediately realized that this is a hypothesis that has been put forward but has never been successfully demonstrated. It comes from a whimsical speech by Swedish physicist Odris.

At that press conference, Odellis, who came on stage as a special guest, drank a lot of wine.After a drunken opening speech, he said a lot to the participants: "If there is a time traveler from the future in our world at this moment, it is a pity that we will not be able to see him. He also must not be able to touch us. For time that has passed cannot be tampered with. If a thing happens, then it is fixed and can never, never be changed. Our poor, high-spirited traveler, from the future Descending here. You are welcome - you can hear me, you are a bystander, but we will never face each other, never communicate. There is no goddamn ancestral paradox, the universe has not stopped since the day it exploded To death. It cannot go back in time, and neither do all of us who live in space, all of us."

This is the insurmountable barrier between the "fixed" time and the "ongoing" time.

After the meeting, Odris was rushed to the hospital because of alcoholism. His remarks were recorded by reporters and published in a satirical column with a ridiculous illustration.

Odris was an alcoholic physicist, and this hypothesis, known as the Odris Barrier, was seen by many, but no one took it seriously.Until Chen Shiyi made the first experimental jump, Chen Zhenghe didn't even think of anything related to the Odris Barrier.

It cannot be verified and therefore cannot be trusted.

But only it can explain everything after the space transition.

Everyone who uses Chen Shiyi must understand Odris Barrier.However, due to the recent revision of the training materials, the new ones have not yet arrived, and the old ones were all shredded by Zhou Sha and sold for the money that the Management Committee used to buy daily necessities, so Zhang Xiao didn't know anything about it yet.

After hearing Gao Qiong's report, Ying Changhe only felt that there were two heads in one head—the size of two hundred heads.

He had never encountered such a situation, and never thought that the guide he recruited could overthrow a scientific theory.

Although this theory is strongly alcoholic.

There was a brief silence in the office.

Gao Qiong realized that this news was like a tactical nuclear weapon with an equivalent of 2000 TNT to Changhe.He happened to have no interest in speaking, so he closed his mouth tightly and kept silent.

"Back to the question just now." Ying Changhe finally said, "I have handed over the relevant clues of "Notes on Auspicious Hutong" to this library, Gao Qiong, I declare for the last time that you cannot interfere. If you harass Yuan Yue again, I will Will formally consider firing you."

"...I'm not harassing him, it's because I only know him in the restoration team." Gao Qiong said.

"Whatever you want. You can say whatever you want, but you must never interfere. Do you understand?"

Gao Qiong gritted his teeth and nodded curtly.

"Call Yuan Yiwei and the others over." Ying Changhe stroked his bald head slowly, "Zhang Xiao wants too. I want to give you a lesson on the Odris Barrier."

For both Zhang Xiao and Gao Qiong, this day passed extremely long.

It was the first time Zhang Xiao heard about the Odris Barrier, and it was also the first time he understood why Gao Qiong looked at him so strangely when he met Persimmon.

It was a look mixed with shock, confusion, resistance, and some distrust.

At the request of Ying Changhe, Yuan Yiwei, Zhou Sha, Gao Qiong, and Zhang Xiao all promised not to tell this matter. This is an internal secret of the Cultural Management Committee.Ying Changhe will take Zhang Xiao back to his alma mater to find his mentor to study the cause of this problem, but everyone must keep their mouths shut until they come to a conclusion.

Because of the Chen Yi incident, the Cultural Management Committee was closely watched by the Crisis Office. Everyone understood what Ying Changhe meant: Zhang Xiao was very special. Once this matter got out, he would immediately become the target of the Crisis Office.

Gao Qiong's suggestion was not adopted, and Ying Changhe gave him a stern warning, his face full of impatience.The 100 yuan fine that Zhang Xiao gave him that day was almost used up, leaving only 30 yuan.After the meeting, Yuan Yiwei and Zhou Sha set off to the Crisis Office for a meeting. Ying Changhe continued to give Zhang Xiao a brief explanation of the Odris barrier and the ancestral paradox. He had nowhere to go, so he had to dig out the new task dispatch form and start to check the information.

The location and time of his next mission have already been marked out, and what he is looking for this time is a purple clay peach-shaped cup (*) from the Ming Dynasty.This cup is very delicate in shape and is a famous drinking vessel. Gao Qiong kept looking at the hand-painted image.

He likes to look at these cultural relics very much, imagine their touch from the photos, and touch them even at the risk of being fined.

This was something he had never seen in his past life.

When he was about to leave early, Zhang Xiao just came out after class.He looked a little lost and haggard, and he didn't respond when he caught a glimpse of Gao Qiong sitting in the meeting room from a distance, turned around and left dejectedly.

Gao Qiong squeezed the 30 yuan in his pocket, which was just enough for two people to eat two set meals in Jiu Ge milk tea.The dinner package also comes with free milk tea, which is very cost-effective.

He was about to greet Zhang Xiao when Zhang Xiao's cell phone rang.

He kept his mouth shut and followed Zhang Xiao out silently.

Zhang Xiao hummed for a moment, hung up the phone, and turned around to find Gao Qiong right behind him.He jumped three feet away, quickly took out a medicine bottle from his bag and swallowed a sugar pill, before he dared to talk to Gao Qiong face to face: "By the way? Let's go together?"

"Where do you live?" Gao Qiong asked him, "By subway or bus?"

"Tsinghua Community." Zhang Xiao said, "What about you?"

"It's not going the same way, go in the opposite direction." Gao Qiong said, "How about treating you to a meal? I have something to tell you."

Zhang Xiao seemed taken aback, and stopped moving in front of the elevator.

"You want to invite me to dinner?" He was dubious, "Do you still have money?"

"Yes." Gao Qiong frowned.

Zhang Xiao thought for a moment, then waved his hand: "No, I have an appointment with a friend. I'm going to find him in his shop now."

Gao Qiong blinked.

He didn't expect to be rejected.

"Oh." He nodded. ——But it's great, he can eat two set meals by himself tonight.

The two stood in the elevator, neither of them speaking.Gao Qiong lowered his head slightly, and he found that Zhang Xiao's ears were red.

"Chestnuts are delicious." Zhang Xiao's voice trembled a little, "Did you buy them for me on purpose?"

"No." Gao Qiong replied, "The administrator of the Zombie Museum gave it to me when I came here. I don't like eating things with shells, so I gave it to you."

Zhang Xiao looked back at him and nodded suddenly.

No wonder I found a heart-shaped chocolate in the paper bag at the end of the meal.He thought to himself, so it is.

Du Qiwei was already waiting for him at the back door of the National Expo.It was quite cold in the alley, with a little wind blowing, he shrank his neck and stomped his feet, when he saw Zhang Xiao coming out, he rushed over with a whimper, and hugged him tightly.

"Brother is freezing to death. Go home, I have good news for you." He showed a supermarket shopping card, "My boss gave it to me today, saying that last month's turnover was good, and it was treated as a bonus. Shall we go buy some hot pot?"

Zhang Xiao nodded, not in a good spirit.

Gao Qiong stood a few steps behind him, staring at Du Qiwei who was shoulder to shoulder with him.

He knew at first glance that the person holding Zhang Xiao was a sentinel just like himself.

Zhang Xiao turned around and waved at him: "See you tomorrow."

Gao Qiong nodded in reply, turned and walked in the other direction.

Du Qiwei was very curious: "Damn, she looks good. The one you like?"

Zhang Xiao admitted.

"How so? What's going on now?" Du Qiwei was excited and excited, shaking Zhang Xiao's shoulders violently.

"He just said he wanted to invite me to dinner, but I didn't agree."

"Why? You are stupid." Du Qiwei was puzzled.

Zhang Xiao walked forward slowly and said, "Today the director talked to me about work. I asked him if he could put me in the same group as the sentry, just like another pair of sentries in the unit." It’s like a guide, put together. The director refused to agree, and told me to keep me from interacting with him, otherwise it would be of no benefit to me.”

Du Qiwei didn't know what to say for a while, so he quickly put his arms around Zhang Xiao's shoulders: "Don't be depressed, I'd like to share some good news with you. Didn't I follow the illegitimate daughter of the popular movie star recently, and I caught it!"

He patted the camera in his satchel, with a proud face: "I took a lot of photos, and I gained a lot."

Zhang Xiao cheered up and congratulated him.Du Qiwei looked around, it was an empty alley.He lowered his voice and said to Zhang Xiao: "And I also found out that the little girl is a sentinel."

Zhang Xiao was taken aback: "A female sentinel? That's rare."

"Yeah, this is the first time I've seen a female sentinel at such a young age. She's only in the sixth grade, but she has long arms and legs, and she's very similar to her mother." Du Qiwei chirped, "Her mental body is like a lion. It's pretty majestic. But her parents seem to be ordinary people, which is rare. At least one of the parents of a female sentry will be a sentry..."

The excitement that this good news brought to Du Qiwei and Zhang Xiao disappeared after they finished eating the hot pot.

Du Qiwei's informant called him.

The young female sentinel was attacked on her way home from cram school.Her mental body, which has not received any combat training, was defeated by the opponent after only resisting for half a minute.

When Du Qiwei rushed to the hospital with his camera, the little girl was gone.

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*Ancestry Paradox: Also known as the Grandfather Paradox or the Grandmother Paradox, it is an extremely common key problem in time travel novels and movies.A time traveler going back in time would cause a butterfly effect, and if this problem cannot be solved, then time travel will not work.In order to solve the ancestral paradox, many scientists including Hawking have put forward various hypotheses, among which the parallel world theory is the most closely related to the ancestral paradox.

* Zisha peach-shaped cup: Ming Dynasty drinking vessel, now in Nanjing Museum. (Source: "Dictionary of Chinese Cultural Relics")

The author has something to say: There are really a lot of science fiction stories discussing time travel and ancestral paradoxes.Because this is a particularly interesting subject with a lot of room for development, such as the very famous "Butterfly Effect", the first one is the most exciting, especially the director's cut version.But what I want to recommend here is a short story against the ancestral paradox: "You Revenant Corpses" by Robert A. Heinlein.It is very short, but discusses extremely interesting issues.It has been made into a movie "Pre-Destination", but I haven't seen the movie_(:з」∠)_

In fact, when I explained the ancestral paradox, I was very disturbed because it had an important relationship with the biggest foreshadowing of this article, but after thinking about it, I felt that it didn't matter. Anyway, many readers have heard of these concepts.This article is a pseudo science fiction, mainly about love hehehe, and recommended books (serious face

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1. Director Ying will change his mind to match the two.

2. If you feel that my writing is too muddled to understand in this article, please tell me. _(:з」∠)_Because there are a lot of settings, so I am more worried that the writing will be boring or not clear.

3. The explanation of terms related to the content of the text will be explained in the text. The content of the note marked * actually has little to do with the main text, it is purely a supplementary explanation, or the author's own bad taste.