Probably not well worded (bad at Physics!)
In: Physics
The simplest explanation of the test itself is shown here. It is what got me interested in quantum physics as a lay person. It demonstrates the randomness of the world or why having the faith the size of a mustard seed can over mountains. https://youtu.be/Q1YqgPAtzho?si=VllopCYGMalDjY_b
I’m reading “The Hidden Reality” by Brian Greene it’s a good read if this is something you’re interested in. He goes through all the possibilities and theories for alternate universes and the physics behind it in a pretty approachable way.
I’ve read that it could prove we’re in a simulation. For example how observing something changes its structure on an atomic level could prove that like a video game the hardware running us would struggle to render and simulate the entire universe all of the time so it changes only if we’re looking at it.
Not very good at explaining, I’m no physicist but could this be a possibility?
Let’s just get one thing out of the way, the Many World hypothesis is just one of many interpretations of quantum mechanics.
The double slit experiment is actually that important to this. It just shows that light (and also particles) behaves like a wave. There’s nothing mysterious about the interference patterns, waves make those in classical physics. Water waves make them.
What DOES play into Many Worlds is actually the opposite, the part where the wave behaves like a particle. For example, hitting the screen in a precise spot as if it had taken a very specific path after having already interfered all over place like a wave.
When the fuzzy cloud of “is it here, or is it there, it’s all possible” suddenly interacts in one specific point in space at a precise moment (like a particle) despite it hypothetically, according to the physics governing it, being able to happen at a range of other times and positions, that’s when the Many Worlds people go “actually, it all DID happen, in alternate universes”.
What it shows is that subatomic particles, of which light is by far the most accessible, just do not behave like macroscopic objects and thinking of them using intuition calibrated to throw sticks at mammoths doesn’t work.
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