Why is it assumed that the laws of physics are constant...

Something about an unstoppable force and an immovable object.

I don't believe we're wrong. We only know what we've discovered so far. Even in its simple form like force and motion. An object in motion will stay in motion until a force is acted upon it. That's a constant law that's proven everyday ya know.

Until something "mystical" or whatnot comes along and changes that then it is what it is.

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Prove they aren't.

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Can't prove a negative. That's not how it works.

For many of the laws of physics as we understand them, one of the requirements is that they must operate the same everywhere and under all conditions for everything to make internal sense. They must operate the same whether you're here or there, whether you're stationary or moving, whether you're facing left or right, whether you're rotated head up or head down, etc. Otherwise, there are avenues in which they conservation laws of the universe can be broken, and the whole thing starts to unravel and become nonsense.

We can experimentally prove that all kinds of measured values must be conserved at all times in our spacetime and the laws we deduce for our spacetime must obey this conservation to be internally logically self-consistent. When we make predictions using the laws of the universe as we have deduced them to operate in our local spacetime and look out far into the cosmos, it generally behaves the way our predictions say it will behave. This is strong evidence that the rules here are the rules everywhere.

Now, this isn't to say there are things we just don't know. The marriage of the quantum and the classical (i.e. gravity with the other three forces) escapes us at this point. However, this is almost certainly due to a lack of knowledge and not the universe acting under different laws under different places.

This is also not to say that the universe can't operate under different rules from time to time. However, if those rules changes, they do so within a framework that says they follow the same rules of changing everywhere. For instance, ice behaves differently than water, but they're the same substance. However, the WAY that ice and water behave differently and how they go from one to the other is the same in my freezer, your freezer, on Titan, and so on and so forth.

The law of physics are continually benchmarked against observations out in the universe and continually proven correct. Now when you get to the subatomic level is when things start to get a little fishy

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The law of physics are continually benchmarked against observations out in the universe and continually proven correct. Now when you get to the subatomic level is when things start to get a little quarky

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fixed

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Now when you get to the subatomic level is when things start to get a little quarky

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I see what you did there. Lol

Was watching an interview with one of the guys that was a lead on the Haldron particle collider. They had to develop a neural net just to measure and analyze the data they obtained and he helped with that as well I believe. One of the things he talked about was about how the physics of a universe are governed by what he called a cosmic number. Our cosmic number allows for matter to exist instead of everything just being a light and energy soup, but he talked about how it’s possible there are neighboring universes with different cosmic numbers and what those universes would look like. Could we even perceive or measure them if their ‘light’ is different than ours?

I’m probably not doing his idea justice but it was cool to listen to.