Enter the Immortal Cultivation

Acoustic black hole is a concept from condensed matter physics.

A black hole is a region where even particles moving at the speed of light, such as photons, cannot escape.

Then, the region where phonons cannot escape can be called an acoustic black hole.

Let an object move back and forth at supersonic speed in a medium, and eventually form a turbulent flow that can swallow all sounds.

It has strangeness and difficult-to-guess properties,

which is the so-called "acoustic black hole".

And the way an acoustic black hole emits Hawking radiation is "phonons".

This coincides with the method of saving the Heavenly Demon King.

Using this method, scholars simulate black holes and explore some properties that real black holes may have.

This is also a rare highlight moment of Liuyun Sect in the past five hundred years.

This is even the first time that a subsidiary sect under Liuyun Sect has received a large number of equipment orders in so many years.

But if acoustic black holes can release phonons in this world, it means that Hawking radiation is also very likely to be established in this universe. Black holes are not just for input but not output. A lot of information will still appear in this universe with Hawking radiation.

In this case, the probability of a black hole killing a foreknower is undoubtedly much smaller.

Perhaps only a Kerr black hole with a double event horizon can effectively kill a foreknower.

Of course, the benefits of acoustic black holes are not limited to these.

It is of great help in the study of black holes.

Of course, the human race still hopes to be able to directly contact black holes.

"Speaking of which, since the Iron Kings are a black hole jet civilization, the straight-line distance between their living area and the black hole will not exceed 100,000 light years... and the title of 'Lord of the Eight Thousand Guixu Rivers' also means that they control about 8,000 black holes. Maybe at that time, we can also get the opportunity to study black holes." Wang Qi thought so.

Of course, this is all speculation and can only be regarded as a beautiful vision.

The relationship between the Iron Kings and the Dragons is not necessarily very good.

The Iron Kings may not be willing to help the Dragons.

After learning the news, Wang Qi once again returned to his place of retreat, waiting for the Dragon Emperor to wake up and wait for the opportunity.

The three months mentioned by the Demon Emperor was actually just the "shortest time".

They actually waited for seven months.

During these seven months, the human race changed again.

Due to the establishment of time reversal symmetry, the concept of "reversed universe" or "reverse time universe" was also proposed.

Some people believe that this statement, like the "dark matter" model, is a new model proposed just to explain some problems that cannot be explained now.

At least in Shenzhou, mainstream research has not yet accepted the existence of dark matter. There is no sufficient data to show that there is a substance that does not interact with ordinary matter, has only gravity, and can only distort time and space.

"Reverse time universe" also has this trend in the eyes of some people.

But the limited foreknowledge that the past and the future are all in one body supports time reversal symmetry.

Under this model, there is indeed a reverse time universe. The time arrow of that universe is opposite to the material universe we usually come into contact with.

And this reverse-time universe, combined with the forward-time universe, is the whole picture of the entire universe.

Of course, there are also many objections to this model.

Opponents quickly proposed the idea of ​​"tachyon matter universe" or "superluminal universe".

In addition to the low-light-speed universe we are exposed to in daily life, this universe also has a high-light-speed universe - of course, it can also be called "superluminal matter flow".

According to the principle of symmetry, the faster the matter in the superluminal matter universe, the lower the energy, and the slower the speed, the higher the energy.

When tachyon matter slows down, it absorbs energy, and when it speeds up, it releases energy.

"Light speed" is the symmetry axis of these two universes.

According to the principle of the way of comparison, superluminal matter will not interact with low-light-speed matter. However, the state of past and future returning to one body is that the body has completed the mixing with superluminal matter.

At least "tachyon communication" is also theoretically superluminal and violates the law of causality.

This metaphor was initially an irony, just like the cat of the wave Tianjun.

But very soon, this irony was actually accepted by people.

Some supporters actually tried to prove the equivalence of "reverse time universe" and "superluminal material flow".

The closed timelike curve model is not compatible with this statement.

This is another round of debate.

While the monks of Guiyi League were arguing, Piaomiao Palace was not idle either.

They were moving deeper.

Since time reversal symmetry is very likely to be established on a cosmic scale, the new particle model has to take this into account. Moreover, the supersymmetry that should exist in the microscopic field of the auraless universe is completely gone here.

The beautiful and neat array of the "standard model" is also shattered.

However, with the joint efforts of many free monks in Piaomiao Palace, a "standard model" of the aura universe is gradually taking shape.

And in this process, two free monks in Piaomiao Palace successfully proved the truth.

They plan to use a century or so to verify this.

This involves a series of empirical evidence, which requires the full support of the entire Piaomiao Palace, and even many sects such as the Guiyi League and Xuanxing Temple.

If this plan is completed, it will be the most important achievement in the next two hundred years.

Time goes by like this.

It wasn't until half a year later that the Xihai earthquake occurred.

No, it's not quite appropriate to call it an earthquake. In the void, there is infinite spiritual power and danger, shaking the earth and sea water.

The waves surge. A huge wave several meters high surged towards the western border, but was quickly calmed down by the Immortal Alliance monks who had prepared in advance.

This lasted only a brief moment.

The Dragon King appeared on the back side of the moon silently. He is now fully awake. The strongest man in the observable universe is no longer sleeping. He can completely restrain his power and ensure that he will not have much impact on the outside world.

At this moment, the only aftermath was that the number of sunspots on this side of the sun suddenly increased by a few percentage points.

The Dragon King is two thousand kilometers long, which is not huge compared to other powerful dragons. Although he can also take out his body stored in the closed space and become even larger. But for him, this is the perfect size for power. The Dragon King disappeared for a moment.

The next moment, he appeared above the Sea Dragon-Forbidden God.

The Dragon King murmured: "My brother, you are not willing to live for the future I have chosen, so are you still willing to fight for your past friends?"

no answer.

Because the Dragon King soon knew the future.

Shi Long Xuanyu took the initiative to tell him in a certain "possible future".

Then, countless cracks appeared on the surface of Sea Dragon-Forbidden God.

The main components of Sea Dragon-Forbidden God include the bottom layer of nitrogen, water, ammonia, methane and other substances. Substances with lower boiling points vaporize almost instantly. Violent explosions ripped apart the planet's thin atmosphere. Even those small branches create mushroom clouds on the ground.

The moment the Dragon King took back his power to suppress Shi Long Xuanyu, Shi Long Xuanyu had already reacted.

Of course, he didn't come out instantly.

Because there is not only one dragon clan sealed within the Sea Dragon Forbidden God.

The rift across the entire celestial body expanded wider and wider. Dragon claws like mountains poked out from it. Golden energy surges.

The Dragon King quietly filled in a large number of small meteorites prepared in advance to ensure that after Shi Long Xuanyu left, the mass fluctuations of Hailong-Forbidden God would not plunge the Great Sun territory into turmoil.

A large amount of rocks were swept into space due to the sudden vaporization of the material, and then were stirred up by the Dragon King's tail and filled back to the surface of the celestial body.

Although the two sides are enemies with different opinions, there is an unusual tacit understanding on this matter.

It wasn't until a quarter of an hour later that Shi Long Xuanyu stretched out his body from the planet like a young dragon shed its shell.

Judging from the size alone, he is a full size larger than the Dragon King.

The giant dragon stared at the Dragon Emperor and said: "Yueluo clan, no matter how many years we meet again, you will always be the same hypocritical person."

"I just believe that among the choices I make now, there is a wonderful future that I have never seen." The Dragon King said: "Limited foresight is only limited after all. Pursuing the infinite with the limited... is too big, I dare not Gambling with the lifeblood of the Dragon Clan."

"Let the so-called followers help you walk? You really can imagine it, Yueluo clan." Shi Long Xuanyu pointed his tail at Fengdu Demon Prison in the distance: "Isn't that evil barrier your answer?"

"What if 'that evil obstacle' is the Dragon Clan, and you are the one who is suffering now, and it is the Dragon Clan who is suffering the disaster of overthrowing?"

Dragon King asked calmly.

"I can leave my homeland to you and let you develop your followers." Shi Long Xuanyu roared: "But I really didn't expect that you would actually take the initiative to suppress the emergence of Hedao Limit? You even want to let everyone The limit of Hedao is sleeping! Including yourself!”

"The ability to know beforehand and wisdom are not the same thing. Maybe there are some things that the ability to know beforehand can not allow us to see, but wisdom can. We have gone through places where power can reach, but we have never reached the 'other shore' of wisdom. These All my current friends told me." The Dragon King still said: "Do you know how many times Houchi has split?"

"We are different from Hou Chi! Is blood our natural connection?"

"Do you remember the Yuan clan?"

The two giant dragons faced off one calmly and the other furiously, but neither could convince the other.

Finally, Shi Long Xuanyu asked: "Did you also say the same to Xing Sheng?"

"That's right." Dragon Emperor Hanshou said: "I am enough. As long as I am here, those who knew before will not start the war lightly. In addition, my brother..."

"I dare not have a brother like your Majesty." Shi Long Xuanyu sneered.

"Shi Long." The Dragon Emperor said: "I have no intention of arguing with you about this kind of thing. We can discuss the issue of followers again. Now we are facing another issue."