"A computer capable of calculating the entire universe ......"

"Can it really exist?"

Hearing this question, Pan Lishan was also stunned.

It seems that all of a sudden I have returned to the night when I was at the Xiaoshan base.

He still remembered the conversation at that time, and at the same time, he also remembered that he had given Lu Yun a completely negative answer.

At that time, I said that "if we can have an existence that includes all the information elements, it is no different from the evolution of the entire universe, and what is needed is the energy of the entire universe."

That is, the Laplace demon.

It's just that this inference is actually known to Pan Lishan to be incorrect.

After all, he is studying quantum physics, whether it is from the amount of information or from the indefinite state of the quantum itself, and even the energy required by this "Laplace demon", it can only be shown that it has been falsified.

However, the universe is infinite, and even now they have learned of the existence of higher dimensions.

This in itself shows that the universe is not unique.

Whether it's a multiverse or a high-dimensional universe, they all confirm their existence, and they don't even interfere with each other.

In this case, does the Laplace demon really exist, and is there really a formula for determining the quantum state......

It's hard to say.

After pondering for a while, Pan Lishan finally spoke:

"Rather than asking if this machine exists......"

"Before that, let's explain the nature of time."

He didn't say it directly.

Instead, it changed the subject.

Lu Yun is undoubtedly quite interested in this topic.

He nodded, listened to Professor Pan's small class, and started again.

"Here, we must first introduce the concept of entropy."

"Entropy?"

Pan Lishan nodded: "First of all, the more chaotic the system, the higher the entropy value. ”

"Conversely, the more stable the system, the lower the entropy."

"This is in astronomy, chemistry, physics...... Even machine learning and artificial intelligence are of great significance. ”

"This brings us to the concept of information entropy......

"Anyway, though...... This has not changed even now that our science has incorporated a large part of the cultivation. ”

"This is because of the asymmetry of entropy."

"This brings us to other sciences."

"Physics, quantum mechanics, and the formulas mentioned in the theory of relativity all show symmetry in time."

"That is, whether time flows in a positive or negative direction, these formulas exist and work."

Lu Yun frowned when he heard this.

Indeed, even when going back in time, these formulas work their own.

After all, time is physically calculated using lengths, not vectors.

This is something I have never considered before.

The study of physics and mathematics is actually a discussion of the truth of the universe.

So if these physical quantities have nothing to do with how time flows, then it may also mean that the way time flows in the current direction is also not unique?

Thinking so, Lu Yun also opened his mouth and asked:

"Does that mean time has ever gone backwards?"

When Pan Lishan heard Lu Yun's sudden question, he was stunned at first, and then smiled:

"Maybe it's a possibility."

"But that's not the point."

"The focus is on entropy."

Pan Lishan continued:

"The reason why I say symmetry in time is because we can only observe the positive flow of time."

"And in this positive flow of time, the asymmetry of entropy speaks for itself."

This time, they seem to have just stepped into the middle of the story.

"As I said before, the more chaotic a system is, the higher its entropy will be."

"The more stable a system is, the lower its entropy will be."

"And the universe we observe now, as long as it evolves naturally, it is developing in the direction of entropy increasing with the passage of time."

Lu Yun raised his eyebrows: "Developing towards disorder? ”

Pan Lishan nodded: "That's right." ”

"This is the law of entropy."

Lu Yun thought for a while, and then said, "But, why can time only flow in a positive direction? ”

"Since those physical formulas are also true in the time of reverse flow......

"Is it possible that there is a reverse time?"

Pan Lishan said: "It's not so much that it can only flow in the positive direction...... Rather, we can only observe the time of the positive flow. ”

"As for why it flows in the positive ......"

"It may have something to do with the distinction between positive matter and dark matter."

"According to the Big Bang theory, at the beginning of the universe, there should have been an equal amount of positive and antimatter."

"But of course...... We have not observed the existence of any dark matter. ”

Pan Lishan said with a smile:

"After all, we are in a positive material world, and time flows in reverse."

"In the world of dark matter, time is undoubtedly flowing backwards, and perhaps the other party is also in our world, but we can't detect the positive and negative of the other party."

Hearing this, Lu Yun only felt that his heart was suddenly twitching.

Dark matter?

Time in reverse?

Can't feel the positive and negative of the other person?

Suddenly, Lu Yun's mind flashed that incomparably magnificent picture.

It was a vast continent with almost no borders, in which nature and science came together perfectly...... It seems to be a real paradise.

That's the home planet of the Interstellar Convention.

There, is it time that flows backwards?

"Dark Matter ......"

The reason why Lu Yun raised this question of "predicting all the machines in the universe in the future" was because he wanted to know how the Interstellar Convention had captured its existence at least tens of thousands of years ago.

He originally wanted to use this entry point to find the place where the interstellar covenant originated in time, and perhaps complete the destruction, so that there would be no more interstellar covenants in this universe.

However, at this time, what Pan Lishan said seems to be gradually getting closer to reality.

When Lu Yun was thinking like this, he suddenly said:

In other words, instead of discussing whether the future can be confirmed, it is better to discuss whether the other party's time is flowing in a positive direction.

Pan Lishan shook his head:

"I don't know if there is a machine that calculates everything about events."

"But in fact, the end of this universe can still be predicted."

"Since the end can be predicted, the process can also be known through calculation."

"As I said before, the universe with positive flow of time has always been in the stage of entropy increase."

"Countless forms of energy are transforming in the direction of heat."

"In the transition to a state of disorder."

"And the end of the whole universe...... It will be the ...... after the entropy increase has reached the extreme."

"Heat death."

Lu Yun didn't study these, although Pan Lishan had tried his best to explain in simple terms, but in fact, Lu Yun was still a little confused to understand.

But that didn't stop him from being able to understand the essence of these things.

If the Interstellar Convention were the existence of a dark matter world, then many things could be explained.

For example, why they want to destroy the earth, for example, how what they do is observed by them, for example, why their goal is themselves, there are answers.

If their starting point is the end of the universe, then their past is their future.

And within the technology of the other world, there may be a way to predict the future.

For example, even if the "machine that predicts the future" does not exist, they can learn about the future of the positive material world by observing the positive material world.

"This ......"

Lu Yun felt a little headache.

At this time, Pan Lishan spoke again:

"Do you remember what you asked me when you were at the Xiaoshan base?"

Lu Yun nodded: "I asked, if the future is certain." ”

Pan Lishan also nodded and said, "At that time, I didn't know your methods. ”

"But at that time, I was undoubtedly confirming the certainty of the future."

"I used the example of a machine that could calculate everything in the universe, but in reality, it was just an example."

"And now after that, you should be able to understand what I mean."

"Our past is each other's future."

"And the future of the other party is our past."

"If it weren't for your existence......"

"Lao Lu."

"There is no doubt that the future cannot be changed."

"Everything that happens in the passing of time, whether you want to change the future or not, is already destined for the future past."

"But if you can go to the past yourself, of course those are two different things."

Hearing this, Lu Yun fell into deep thought.

"Through what I've seen now......"

"It should be possible to confirm that the Interstellar Covenant is a dark matter civilization."

"It is extremely normal for civilizations in the same positive universe to conquest, vigilance, and destruction of each other."

"Not to mention another civilization in the opposite direction of time flowing."

"Just ......"

"There's still something wrong with the Interstellar Covenant."

A new question appeared in Lu Yun's mind again.

"God, Mother Earth, such a four-dimensional being......"

"What exactly is the relationship between them and the Interstellar Convention?"

"There must always be a reason for doing things according to the instructions of the Interstellar Covenant, right?"

"Don't they know about dark matter?"

“…… Wrong. ”

"Because the future can't change?"

Lu Yun suddenly remembered what God had said to him.

God can change the future because of cause and effect attached to himself.

In fact, he himself cannot interfere with the future.

And what does it mean to destroy the planet to prevent yourself from continuing to change the future?

If you change the future, the past of the Interstellar Covenant will change accordingly?

For yourself, the Interstellar Pact is getting weaker and weaker?

After all, judging from the time of the reverse flow of the other party, when the time of the forward universe comes to the heat relay, the universe of reverse flow time has actually just begun?

The end and the beginning are staggered, and then a new cycle starts again?

It's too hard.

Lu Yun rubbed his temples.

plus the "self" that I found in the place where the interstellar convention was located before.

These questions are too mysterious, and these answers are completely unsolvable for a while.

However, Lu Yun was not discouraged by this.

After thinking for a moment, he found the crux of the problem.

That is, how do you enter the anti-universe that flows backwards in time?

With this question, Lu Yun asked again:

"Have we ever observed a time rewind?"

"If you want to touch the world of antimatter, do you want to ...... No chance at all? ”

Pan Lishan nodded.

He opened his mouth and said, "At least, the current human race has no chance. ”

Hearing this, Lu Yun gritted his teeth.

Could that be the Interstellar Convention...... Is it completely invincible?

If the other party can come to the positive time universe, but you can't go to the reverse time universe, then everything you do can only be defense.

So what's next?

However, at this time, Pan Lishan seemed to suddenly think of something.

He suddenly narrowed his eyes and spoke:

"But ......"

"I've seen a story."

“……”

"Wait until I find out."

Hearing this, Lu Yun was stunned and happy in his heart.

It doesn't seem to be completely out of chance?

Pan Lishan's fingers crackled on the keyboard, although now that human beings have entered the era of brain-computer, Pan Lishan is still accustomed to using the primitive way of using the keyboard.

"Found it!"

August 11, 2014.

"A supernova explosion was detected."

Pan Lishan pushed his glasses and explained carefully:

"Twice, to be exact."

"The electromagnetic storm generated by the explosion of that supernova is so strong that it can theoretically touch the boundaries of the universe."

"And this was detected at the same time as two winds...... It wasn't just two explosions. ”

"It's the wave of the explosion that crosses the Earth from one direction and again from the other."

"If you divide these two waves into wave A and wave B, then flipping the B wave will completely overlap the wave A."

Both Android and Apple are available. 】

"Such a phenomenon ......"

"I think it's enough to be called a step back in time."

Hearing this, Lu Yun had another bitter smile in his heart.

Supernova explosion?

That kind of energy intensity, I can't definitely reach it.

And, even if you can do it, how can you be sure that you can enter the reverse universe because of this?

The situation is getting more complicated.

However, Lu Yun is not helpless.

At this time, after containing so much dark blue matter, he can see the past and the future for a certain period of time.

When you know the approximate timing of the supernova explosion, you may ......

Can we observe the future and past of supernovae by this means?

Maybe you can understand something?

Maybe you can get a way to the world of dark matter?

There are too many mysteries at this point......

What he has to do is not to drill the horns of the bull, not to cling to a problem.

It's about taking the first step as soon as possible.