I have a friend named Anda, he's a nuclear physicist, a quantum mechanics guy, he works in the Academy of Sciences, and every day he fiddles with various colliders or cosmic particle capture devices, and studies all kinds of particles. Pen "Fun" Pavilion www.biquge.info and I only buy all kinds of chestnuts to eat every day.

One day, he called me out of the blue and said that he had discovered a very strange particle that could connect quantum mechanics with relativistic mechanics.

Everyone knows that quantum mechanics and relativistic mechanics have a feud, and the two schools of thought accuse each other and do not admit each other.

On the phone, he was very excited about his discovery, as if he would win the Nobel Prize with this discovery. But what I wonder is that since he has made this important discovery, he should go to their leaders to report it, why are you looking for me? I vaguely felt a trace of doubt: this kid must be uneasy and kind, or nothing good. But either way, there's something fun I can't miss.

I immediately drove to his lab.

Anda came out warmly to greet him.

I quipped, "Great scientist, what new things have you discovered this time? Can you win the Nobel Prize?"

Anda: "It's no problem to win the Nobel Prize ten times! Come on, come on, come in and I'll tell you." ”

"Come on, don't fool me again," I am familiar with his routine, "You don't fool me once or twice, last time you said that you found a super particle that can destroy the structure of metal nuclei, you can recombine three iron atoms into a gold atom, and as a result......, my iPhone was turned directly into stone;

"It's different this time, baby, if you mess up again this time, I'll treat you to a month's worth of food. "Anda seems to have selectively forgotten about the previous black history.

I'm used to it anyway.

Anda took me to an instrument and began to explain: "You know, according to the concept of space-time in relativistic mechanics, all the space-time of the past, the future, and the present can be put into a coordinate system. But for quantum mechanics, it doesn't matter what the past and future are, time is actually just a probability distribution in quantum mechanics. But the real problem is that space-time is moving, and it is also directional, and this direction is also equivalent to the direction of the expansion of the universe. Since space-time has undergone physical changes, there should be a large number of particle transitions, which should produce a certain amount of radiation. But no one has ever found this radiation.

Anda smiled brightly: "But I still found out." ”

I was surprised: "Is it really fake? Even if there is radiation, it is impossible to detect the movement of time and space!"

Anda: "Don't worry about how I measured it, I'm on the side anyway." First of all, this dimension is a process of continuous folding. From a thread folded to a piece of paper to a paper ball, the dimensions become more and more numerous, and the size of the object becomes more and more compressed and smaller, and we can only see the third dimension with the naked eye; but it is conceivable that after pressing to the 11th dimension (because the mathematical calculation can only be calculated to the 11th dimension at present), the object is no longer smaller, and what does it become at this time? ”

"And then?" I said.

This Guo Degang's version of Anda was proud: "Therefore, if you unfold each particle, you can restore the time and space of a specific period of time." And I captured the particles that were created when space-time moved, and then I could unfold the particles to restore them to what they were at that time. Quantum mechanics believes that particles in the same space-time can communicate with each other and synchronize with each other, and the spin direction remains synchronized. Change one particle, and all other particles will change in sync. And this change is 'instantaneous', that is, faster than the speed of light, which is also a point of contention with relativistic mechanics. ”

I said, "Well, even if you capture this particle, it's expanded, what's the use of that?"

"What's the use?" Anda snapped, "You've been with me for so long, you can't even deduce this—of course, you can travel to the past time and space!"

I said, "No, didn't you say that the past and the future are separate and cannot affect each other?"

Anda: "But space-time must be linear and have causal continuity, so in fact, fine-tuning can affect the subsequent results, and it will not produce a large fracture surface. Even if there is a fracture surface, because space-time is dynamic, he will repair itself. It's like you throw a stone into a pond to make waves, but soon calm returns. ”

I sighed, "Okay, then what do you want me to do." ”

Anda smiled slyly: "You do me a favor and go back in time." ”

"I'll you!" I knew he was going to be okay with me, "You're going to use me as a guinea pig again! What if you can't come back? Forget about losing a mobile phone or something before, this time you want to take my whole person!"

"How can I not come back," Anda reassured me, "Now that I've discovered this particle, I'm familiar with how to use it." Rest assured, my instrument can leap to the fourth dimension and exchange information with various time segments, and I will keep in touch with you who have traveled back to that time period in the past, and then get you back. It's just that the process of this transition is more power-intensive, so you can only use it once a day, and you can talk for two minutes at a time. ”

Anda took out two strange-looking phones: "This is the phone I can talk to you when my instrument jumps to the fourth dimension." The connection between the two phones is not ordinary electromagnetic waves, which have long been dispersed in the super-curved space-time to the point where they don't know where, but through neutrinos. ”

I held the strange phone: "What the hell, it's ugly." ”

Anda clapped his hands: "Okay, then let's get started." ”

"What? I don't have anything ready yet. ”

Anda: "It's better to choose a day than to hit the day, I can't wait, the Nobel Prize is beckoning to me." Flower beauty, ************......"

"You...... You'll have to explain to me how to cross this method, whether it hurts or something. "I don't have a lot of confidence in him.

"It's not an injection, how can it hurt?" Anda explained, "The reason is very simple, I unfold this captured time particle, cut a hole, and you can wear it through the time and space at that time." It will break a little bit of space-time continuity, but space-time itself has all kinds of loopholes and gaps, which is not surprising. ”

"Is it okay to travel to any time period?" I started to get a little interested. It's good to be able to look at the past.

"It's been okay for the last 50 years. Because of the earlier time particles, my instrument is not able to capture them at this time. Anda said.

"If I travel back to me 15 years ago, will I meet me 15 years ago?"

"That can definitely be encountered, because you belong to the originally smooth space-time cut a hole and forcibly stuffed it, after briefly destroying the continuity of space-time, it will quickly merge with the current space-time, and through the causal force of space-time, that is, the space bending force in relativistic mechanics, it will slowly modify the space-time behind. If the change is too big for the space-time to repair itself, it will be troublesome. So you don't do things that change history too easily. ”

"I was a high school student 15 years ago, I was poor at the time, and I wanted to bring some modern gifts to my old self, okay?"

Anda hesitated: "Well, bringing something modern shouldn't change much in the past." ”

"Then I'll go home and get something first. It's hard to go back in time, and you have to bring some gifts. "I'm already thinking about what to bring.

Anda: "Alright, as soon as possible, I'll be waiting for you here." ”

I went home in a hurry.

Then I thought about what to bring to me as a teenager who had no money 15 years ago.

You can bring some money, but it can't be RMB, because the RMB has long been changed to know how many versions. Fifteen years ago, in 2001, if you bring a 2016 version of the renminbi, it must be regarded as a counterfeit banknote. The dollar can, because the dollar is the world's currency, and it hasn't been revised for decades, so bringing a few thousand dollars over should be enough for me to use it for a while. At that time, the price of goods was so low, one dollar was equal to more than eight yuan.

And then there's electronics: I'm an electronics fan, and of course I wanted to bring something high-tech to me at the time. At that time, it was still dominated by BP machines, and there were still very few people who used mobile phones, and I don't know what kind of mobile phone card was back then, it must be different from now, so it should be useless to bring a mobile phone in the past, and you can't make calls. But the iPad can still be brought over, you think about it, 2001! At that time, although there were also laptops, but they were as thick as bricks, and the system was so slow that no one was there, and I brought an iPad thinner than a book, which was not only able to watch movies and TV series, but also played games, which was simply fairy technology, Contra, these extremely low-pixel games.

So I took out my iPad and loaded as many movies, games, e-books, apps, and so on. Because there was no wifi at that time, even if I copied the driver of the iOS system to the USB flash drive, I was not sure whether it could be compatible with the windows 98 computer at that time, so I didn't expect to be able to connect to the computer of the year, and try to copy as many things as possible into the iPad. And then I deleted the little Japanese movie in it -- I didn't want to poison me as a teenager, and I had to go to university. I copied a lot of some good movie blockbusters in recent years, so that it would be good for me 15 years ago to see future movies, and open my eyes in advance.

At that time, I was relatively poor, and my clothes were all stalls, although I was a heartthrob at that time, I was handsome, but the taste of clothes was too low, so I had to bring some high-grade clothes. The city where I was in high school was only a small city, and 15 years ago, there were not even lower-end casual brands such as Metersbonwe, so they all sold goods, so you can amaze the audience with any clothes!

So I went to the pedestrian street again and bought a bunch of clothes, pants, shoes from brands such as zara and H&M, which were enough for me. I was a few centimeters taller than I was 15 years ago.

You don't need to bring anything to eat, the things you eat don't change much, you can buy it whenever you have money.

I'm still trying my best to make up what I should bring with me, to be nice to myself back then, because I was so poor at that time, a country kid.

At that time, the carriages and horses were very slow, and the letters were also very slow, and I couldn't fall in love with a few people a year.

I packed a big bag of stuff and headed to Anda's lab.

Anda was already waiting there, surprised for a moment as he watched me carry a large bag of things, but didn't say anything.

Anda: "It's a pity that we didn't know each other 15 years ago, and I'm too far away from you, otherwise I would really want you to bring something to me 15 years ago." ”

"It's okay, it's going to be a long time coming. I said, "When the experiment is successful, why don't you teach me how to operate this instrument, and then I let you go back in time and bring some gifts to you from the past?"

"Okay, now let's start experimenting. Anda sighed and said calmly.

So I walked into the instrument with this big bag on my back and the neutrino phone I used to contact Chubb in 2016.

Anda began to operate the machine, and the space-time inside the instrument began to compress and fold, leaping to the fourth dimension.

The torn hole in this time and space should be called a wormhole. Anda insisted on using high-energy particles with a strong magnetic field to make space-time highly folded until it broke off, revealing an opening, or a gap, so I walked into the wormhole of the current space-time and entered the space-time particles captured by Anda in 2001. At this time, the space-time particles had been expanded to the fourth dimension by Anda - because the space-time particles themselves were of a higher dimension - and I squeezed into this space-time particle in 2001 through the gap in space-time.

Physiology tells us that our human body is composed of cells, and the DNA in each cell contains all the information of the human body, so just through one cell, a complete person can be completely cloned; I can't help but admire Chubb's discovery this time to make a fortune.

From the unfolding of space-time particles to the incision that sent me in, it was all done by Anda on the instrument.

I just squeezed into this plane that didn't belong to me at this time. As an interloper, it started out as a slight shake in time and space, but it quickly smoothed out. Because after all, I am only a human body, not an entire city, so it is not enough to cause too much fault in time and space, and the self-healing ability of time and space immediately makes time and space smooth out.

If our space-time was designed by a higher level of intelligent life, I was like a bug in a program that had forcibly entered a program that didn't belong to me in the first place. If the space-time designer is here, will he find out that I am intruding, or using anti-virus software or something, and will forcibly fix my bug. Because all the operation of time and space is designed and prescribed, the current experiment of Anda and I is a forcible tampering program, if it is discovered by the programmer, it is estimated that we will not be allowed to do whatever we want, how can there be a reason not to fix the bugs in the program? But all this is unknown now, and we can only take one step at a time. At least, it's safe for now.

I landed at the designated place. I told Anda that he was going to take me to the town where I was in high school.

I'm standing in this small town now, and everything around me is exactly the same as it was 15 years ago, the same buildings, the same scenery. It seems that the date of this space-time particle captured by Anda is at least correct.