What's the Laplace's Demon?

 Hi everyone,

In this blog i was free for the subject; soo i choosed the a physics theory: Laplace's Demon.

Laplace, sums up his theory in one sentence: "if there were a superior being in the universe who knew the positions, speeds, and all the properties of all particles, it would be inevitable that it would predict the future". In fact, Laplace's Demon is precisely this theoretical being that knows many variables and can predict the future.Don't you think this being looks a little like God? Anyway, that's not the point. Let me explain this theory a little more. This theory is based on the deterministic (deterministic, means predictable) explanation of the universe by mathematical equations of classical physicists such as Galileo and Newton. Laplace, who saw that we can find many concepts such as acceleration and speed with formulas, claimed that when enough information is available, the future and past of the universe can be solved as if it were solving a puzzle. It makes a lot of sense when you put it like that, doesn't it? I don't know about you, but when I first heard it, it made very sense to me.

Let me give a simple example to make it easier to clarify in your mind: If Laplace's Demon was real and knew a coin's mass, speed, the force we applied, the gravity of the planets acting on it, and many other factors, the moment we threw it into the air, it would not be a possibility whether it would go on a heads or a tail. You know what I mean?

This theory confused the scientific world for a while, until quantum physics and the Heisenberg Uncertainty Principle. Don't get me wrong, it's not went to clear; it's even more complicated.

According to the Uncertainty Principle, it is impossible to know the position and momentum of a substance at the same time. So this theory denies that the universe is completely deterministic. If you know the momentum of a substance by 60%, you can know its position by 40%. If you know the position of a substance 100%, you have no idea about its momentum. At the heart of quantum physics is this principle. If you don't understand what I'm saying, that's normal, I'm not a physicist. I'd be happy to share resources if anyone wants to.

This blog is getting longer than I expected, so I'll try to cut it short^^ Summarize, Laplace's Demon theory says that the past and future are predictable within the knowledge of all variables, but according to The Uncertainty Principle, it is impossible to know all variables at the same time. The basis for the conflict of these two theories is actually based on the conflict of whether the universe has a deterministic or an indeterministic structure. There is no clear answer to this question in the scientific world yet. Thanks to quantum physics, we know that there are a lot of events in many parts of the universe that we can't link to a cause-and-effect relationship, described as 'random'. But we don't know why this is 'random', can't we explain it cuz of our current science is insufficient, or does the universe have an indeterministic structure?

Thanks for reading, haha actually i don't think anyone read until here. Bye!!