How does physics break down when you go smaller than plank’s length? Why cant you just go like half a plan’s length or a quarter of plank’s length?

Question

How does physics break down when you go smaller than plank’s length? Why cant you just go like half a plan’s length or a quarter of plank’s length?

In: Physics

Answer 1

The term “physics breaks down” means that our understanding doesn’t extend to that realm. That doesn’t mean that reality “breaks down” and nothing happens at that scale. It is our (human) knowledge, theory and equations predicting what happens that don’t work any more.

So there isn’t any meaning to say “half of that” because “that” is as small as we understand today. If we want to go smaller, we need new theories and knowledge. We haven’t discovered that knowledge yet, so there might still be more work for humans to expand their knowledge.