Original link: https://hin.cool/posts/shangzeng.html
“Isn’t time linear?”
“Time?” He said with a sneer, “Time is just a degree you use to record entropy increase at this stage—yes, record, not measurement. It is only an abstract concept, so there is no direction. Next we dialogue, I hope you can downplay the subject position of ‘time’.”
I stared at this man of unknown origin in front of me, twenty-eight years old, with short hair and a clean shaven beard. He was also very plainly dressed, a blue T-shirt and ordinary black slacks. He claims to be from the future, but he doesn’t have exact parameters, so it’s another failed experiment for him.
“Wait!” I seemed to have suddenly found a flaw, “You said—at this stage, my ‘now’ is relatively your ‘past’, right, so time is obviously directional.”
He seemed a little helpless, even a little impatient: “I have experimented several times, and every time I have to explain it to Niu playing the piano for a long time.”
I’m not happy. Anyway, I have learned some basic knowledge of physics and philosophy. The basic laws of the world’s operation are objectively determined, and no one can violate them.
He seemed to see through my mental activities, pulled a piece of paper from my desk, crumpled it into an ugly and irregular ball, pointed to a point in it seemingly casually and said: “Suppose you are in the current situation. At this position—don’t think of your so-called time as a single plane coordinate, any time point plus any spatial geographic location forms a unique three-dimensional coordinate.” He paused, “Of course, this is only so far The three-dimensional dimensions that you can observe. In fact, after 300 years, we can observe more dimensions. If I want to go to the ‘past dimension’, I need not only time and space coordinates, but also three-dimensional The three-dimensional coordinates above.”
“I don’t quite understand, what do you mean the universe above the universe we live in?” I shook my head.
He shrugged: “Probably so. It is very simple to anchor the coordinates with time plus space, because time has laws to follow, but space is infinite. Just imagine an onion?”
A cross-section of an onion appeared in my mind, and I seemed to understand his words: “So, there are parallel universes?”
He nodded.
“Is it possible to freely shuttle between different universes like in “Rick and Morty”?”
He firmly denied me: “Imagine that there are many onions in a transparent box, and the universe you live in is just one layer of one of the onions. Each onion is an isolated system, and the matter in the system is stable. Reliable, if there are exactly the same molecules trying to join it, it will inevitably lead to the collapse of the system.” He added with gestures, “Same-sex repels, do you understand?”
“Understood. But you claim to be from the future, but there is nothing abnormal in the world I live in at this stage.” I became more and more suspicious that this was a lunatic who was talking nonsense, because his words were always inconsistent in understanding. Besides, someone who time travels definitely needs special gear and equipment, and he didn’t have any.
“I told you, don’t just try to understand time!” He looked a little annoyed, his brows were furrowed, as if he firmly believed that I was the cow. But after taking a deep breath, he said, “Suppose you’re at the 20th layer of an onion, and I’m from the 23rd layer—not another onion, the first 19 layers are rotten, and it’s hard for me to reach .”
In the later conversations, he was like a teacher, explaining to me the science he understands in the world he lives in. Time travel is not entropy reduction, Clausius mentioned:
Entropy in an isolated system never decreases automatically, entropy remains constant in reversible processes and increases in irreversible processes.
So his time travel is actually another manifestation of entropy increase, recreating a system with the same mass but different volume in an isolated system. In layman’s terms, he builds a new room that contains whatever elements were in the system at the moment it was built.
But he kept silent about the purpose of this trip, and kept saying that “this is just a failed experiment”. Seeing him sitting in front of the window sill, looking at the moon hundreds of thousands of kilometers away and sighing, I always suspect that something bad will happen.
I handed over a can of beer, and he waved his hand: “I can’t drink because of work.”
It would be easy to open the chatterbox again, so I asked him some topics about the future one after another. Through his description, the future world no longer uses the concept of “country” and “party” to distinguish the inhabitants of the earth. Yes, they have discovered more planets and creatures in this universe. The struggle between nations no longer exists, replaced by plunder and rivalry between planets. Artificial intelligence is highly developed, but the exploration of the unknown universe can only be led by humans.
“It’s a pity that I can’t live that long. Maybe my descendants can witness all you said.” I was looking forward to a world with highly advanced technology, and I didn’t know what kind of life I was living at that time.
He ignored me.
“By the way? How did you understand love at that time?” Although he didn’t pick up my last conversation, my jumping thinking found a new topic. After all, love is an eternal relationship among human beings.
“Don’t mention it, love is more complicated than science.” He sighed softly, “Love is not something that can be quantified into numbers or formulas, it is more like a feeling, or an illusion. But people still They never get tired of researching this stuff, including me.”
“Then when will you go back, and in what way?”
He turned his head and looked at me with an expression of disbelief, and then he became indifferent (or helpless?) a lot: “Sheep, remember what I told you, going back to the ‘past’ is not Does the entropy decrease?”
I nod.
“So there is no me, and when to go back.” He paused, “Simply put, the current you is your future in reverse time and space.”
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