Volume 4: Spacetime Singularity Chapter 11 Membrane Theory and Superstrings
Fang Cheng carefully thought about what the aliens said and found that everything seemed reasonable if he didn't think about it too much, but once he thought about it too much, all kinds of problems would arise.
First of all, if the earth is traveling from the static old world to the moving new world in a continuous process, then it will inevitably feel a continuous speed difference during the process of traveling. This speed difference will tear the earth and all the objects on it into pieces. Although it may be reassembled after entering the new universe, can life still exist in that case?
If all the particles that make up a living person were broken up in an instant and then reassembled again in the next instant, even if the microscopic structure and dynamics of the particles inside the person before and after the reassembly were exactly the same, would his life state still be the same as before?
In other words, is he still alive after the reorganization? Even if he is alive, is he still himself? Has anyone discussed this issue?
Of course, this problem may not exist at all in the current situation, because the Earth is likely to be sent to the new space in an instant, but that will bring more problems about action at a distance.
After all, there is no real "moment" in reality, and any event takes time to happen. Can human imagination really understand such an event that does not take time to happen?
No matter which method the aliens choose to transmit, the mathematical and philosophical knowledge edifice that humans have established will be severely impacted by alien technology.
The irony is that, except for Fang Cheng, all human beings have no idea that they have experienced these things, because with the earth as the reference system, these things happened in an extremely short period of time, so fast that no one would feel anything unusual.
Of course, there is a bigger problem for Fang Cheng, which concerns himself.
"The boundary between our old space and the new space you created...according to what you said, it should be a two-dimensional plane..."
"Yes, you can think of it as a contact surface."
Simply imagine that two one-dimensional lines intersect at a zero-dimensional point, and two two-dimensional planes intersect at a one-dimensional line. It can be seen that N-dimensional spaces of the same dimension will intersect at an N -1-dimensional plane, so in this problem, the intersection of two three-dimensional spaces should be a two-dimensional surface.
"Then as someone who can observe two worlds at the same time , that means I should stand on that contact surface?"
"Yes, your position will not change. It will always be on that plane."
"But... I am a three-dimensional person. How can I stand on a two-dimensional plane? Am I going to be hit by a dimensionality reduction attack? Then can I still survive..."
Are they going to use a two-dimensional foil? Do aliens really have a two-dimensional foil?
"No, no, no, don't be afraid. You will still be in a three-dimensional space. We don't have the kind of dimensional weapons that you imagine in literary works."
Because metal civilization can manipulate spatial dimensions more precisely and flexibly, the disposable and uncontrollable weapons imagined by humans are too low-end for them.
"What is the extra dimension? Is it in the old universe or in the new space?"
"Neither. It's a new dimension. We not only created a circle, but also created a connecting line between the intersection and the circle. You can instantly ."
Fang Cheng understood this confusing question all at once. After all, there are so many popular science videos about this that even people who have never studied physics can get a rough idea.
For creatures living in a two-dimensional plane, to walk from one point on a piece of paper with no thickness to another point, they must pass through a continuous line. However, as three-dimensional creatures, we can use a pen to directly point to the new point because we have an extra direction to go.
The principle here is the same. Fang Cheng can use the extra dimension to "jump" at will in the three-dimensional space where the earth is located, and teleport from one point to another.
The problem is that he cannot enter the space where the earth is located, because he is not a high-dimensional creature after all.
Thinking of this, he suddenly understood why the earth could move instantly into that ring space. The principle might be similar. Aliens must have created more than four spatial dimensions.
"But... I still find it hard to imagine how I can reasonably 'stand' on that interface? This image is too unintuitive..."
"This requires superstring theory to explain..."
Fang Cheng felt that the alien was going to laugh it off again, but when he thought about it carefully, that didn't seem to be the case. After all, if he really didn't want to answer, he would just say that this was something humans didn't have science for, but string theory and superstrings were something that humans already had in their toolbox.
"Your string theory explains that the particles that make up matter, such as protons and neutrons, are closed strings on the membrane, which means that their two ends must be on the membrane; while gravitons are open strings that can penetrate different membranes. Although your current science has not yet proved whether gravitons exist..."
"I roughly understand... In this scenario, the two membranes are the old space and the new space. The particles that make up my body, as the two ends of the closed string, are on the old membrane and the new membrane respectively, while the particles on Earth that are transported to another world, as the two ends of the closed string, are all on the newly created membrane..."
"That's great, you can figure this out on your own!"
If she were here, she would definitely answer before me.
"Well... since we are talking about gravitons... can you tell me whether the gravitons that have not yet been proven really exist..."
"Well, how should I put it? Particles are just a mental model that you abstracted to represent microscopic reality. In our opinion , using particles and quantum mechanics to imagine the microscopic world doesn't give you a good picture. This is actually caused by your limitations as a four-dimensional creature (three spatial dimensions and one time dimension)."
It is understandable that although science may really have its boundaries, this does not prevent humans from pushing science forward in a spiral and getting closer and closer to the truth for the sake of their own happiness and that of future generations.
"But I can't tell you a more accurate picture. In fact, it's not possible even if I want to. Your current mathematics has not yet developed the tools to depict that set of pictures. This... is actually the limitation of four-dimensional creatures. I can't go into too much detail about this..."
In short, I just want to say that those who understand will understand, and I won't explain much to those who don't understand. After all, it's enough for you to know it yourself. Just think about it carefully. Don't ask me what's wrong. It's not good for you or me to tell you. Just pretend you don't know. For the rest, I can only say that it's very complicated and involves many things.
Aliens are also old riddlers.
