On the weekend, Evan went to the laboratory and helped to check and calibrate the experimental equipment, especially the ammeter, oscilloscope and other instruments several times.

Evan's custom plastic parts won't arrive until next Thursday.

The gold leaf that Leiden is responsible for will also be ready next Tuesday.

A new week begins.

Distracted by the experiment, Evan wandered several times in the morning class.

On Monday afternoon, in Professor Carl Anderson's "Theoretical Physics" class, the professor spat on the podium about the history of the development of atomic structure. He started with Dalton's solid model in 1803, to the jujube cake model proposed because of the discovery of electrons, to the planetary model proposed by Rutherford because of the results of the bombardment experiment with gold leaf by α particles, and Bohr's quantized orbital model improved on the basis of the planetary model, and finally to the electron cloud model proposed according to the uncertainty principle in quantum mechanics.

Then, Karl took the opportunity to talk about some basic concepts of quantum mechanics.

"Quantum mechanics is a theory that describes the microscopic world, which represents a quantum system in terms of quantum states, and the evolution of the quantum states of an isolated quantum system over time obeys the Schrödinger equation......"

"According to Born, the description of quantum systems is probabilistic, and the probability of an event occurring is the solution of the Schrödinger equation – the square of the absolute value of the wave function......"

"In a quantum system, the position and momentum of a particle cannot be determined at the same time......"

"The above theory is called the Copenhagen interpretation of quantum mechanics......

"In the Copenhagen interpretation, every measurement of the wave function inevitably leads to the collapse of the wave function, and the eigenvalues that are not measured are deleted......"

When Professor Anderson was talking about this, he suddenly saw Evan sitting in the first row shaking his head, so he habitually called him by name: "Evan, you shake your head, do you think there is something wrong with what I said here?"

Suddenly named, the distracted Evan didn't listen to Professor Quan's question, but he still gave Rick who was sitting next to him a look, and stood up calmly and slowly.

Rick understood, and whispered as fast as he could, "Collapse!"

Just one word, what the hell is this hint!

Evan was unfazed on his face, but he was bitter in his heart.

However, when he stood up, he couldn't help but say something.

Collapse, what collapse...... What else can be related to quantum mechanics?

It must be the wave function collapse, is it difficult or the black hole collapses?

After a pause for a long time, he finally spoke, "Professor, I think the wave function can not collapse. ”

As soon as Evan spoke, he shook everyone, including the professor, and the students opened their mouths in surprise, and the class immediately became very noisy.

Someone was surprised: "What is Evan trying to do, do you want to challenge the entire Copenhagen School?"

Someone whistled and said, "Wow! Sure enough, he is the chief of the freshmen, he is very capable, and his ideas are not ordinary whimsy." ”

Evan became a celebrity in the class after last week's class, and almost no one didn't know him.

Professor Anderson clapped his palms and quieted the class again.

"Evan, you have a bold idea, can you talk about it?"

Professor Anderson loves to have students come up with new ideas, and even if the idea may seem irrational at first glance, it is better than no idea at all.

Evan nodded and slowly expressed his opinion: "Regarding the concept of wave function collapse in Copenhagen's interpretation, Dr. Schrödinger's thought experiment is very vivid, I don't know if you have heard of it...... I guess I haven't heard of it!"

"The experiment went like this: a cat was put into a box equipped with radioactive materials, a Geiger counter and a gas barrel. Suppose that there is a 50% probability that a radioactive substance will emit a particle over a period of time, and a 50% probability that it will remain the same. Suppose that any particle emitted by radioactive material can be detected by a Geiger counter. During this period of time, if the Geiger counter detects any radioactive particles, the gas barrel will activate the mechanism of releasing poison gas, releasing poison gas to poison the cat in the box, and if the radioactive material remains unchanged, the cat will still be alive.

Obviously, in this experiment, according to the principle of quantum mechanics, at time T, the result will be a mixture of live and dead cats with half probability each. And when the observer lifts the lid of the box, it can be conclusively determined whether the cat inside is dead or alive. The result will only be one. In a sense, if the cat is dead, it can be said that the cat was killed by the observation of the observer. This is called the wave function collapse. ”

But if we add the hypothesis that the world is not unique, that there are an infinite number of worlds beyond our observable range, and that our world is only one of them, then Schrödinger's experiment we can explain it this way. The results we observe, whether dead or alive, are just the results of our world. Maybe in our world, cats are dead, but in other worlds, I'll call them parallel worlds, cats are alive. ”

In this way, the descriptive function of the cat being alive and dead does not collapse. ”

"This interpretation can be called a 'many-world interpretation'......"

……

Evan became famous, and this time was no longer confined to the circle of first-year freshmen and teachers, but was known to the entire academy in the shortest possible time.

Along with him, there is also his "interpretation of many worlds".

For a time, Evan became the number one star of the academy. Wherever he went, he was accosted by students or teachers, or who wanted to ask for advice, or simply to express his admiration. In the evening, students from four communities would gather at the Blacker House to ask Evan to teach "many-world interpretations" and then discuss the rationality or irrationality of the theory. Annoyed, Evan even thought about whether to disappear for a while and wait for the limelight to pass.

In fact, in terms of theory, "many-world interpretation" is almost as close to a mental theory as "Schrödinger's cat", because we have almost no way to observe the existence of other worlds.

Traditional physicists don't like this interpretation, believing it to be more of a science fiction concept than a theory (in fact, the concept of parallel worlds does inspire science fiction writers).

But many students who don't have a fixed mindset take this theory as a guideline, because they like countless worlds more than collapse.

Countless worlds mean countless possibilities.

Of these students who believed in the interpretation of many worlds, Rick Taft, who was sitting next to Evan at the time, was undoubtedly the most determined.

"Evan, think again, if a parallel world exists, what evidence is there to prove it. ”

"Is it possible for people from parallel worlds to cross the boundaries between worlds and go to another world?"

Annoyed by him, Evan suddenly thought: "I don't know any of this, but I certainly can't rule out this possibility, or you can set up an organization to find out these world-spanning beings, well, let's call them PlanesWalkers?"

Encourage others to build an organization with their own goals, and I hope I'm not dying......

As a living specimen of a plane traveler, Evan thought.