[soup10]

just because QFT follows an internal logic, doesn't mean the jump from macro physics to quantum physics itself is logical. In my opinion we still don't have a logical explanation for why the model changes so dramatically from classical to quantum physics.

[perlgeek]

The Universe is fundamentally quantum in nature; if anything, we'd need a model that explains why classical physics works so well most of the time.

[pinkmuffinere]

As a naïve fool with no understanding of quantum physics, I want to take a stab at this! Here’s my hypothesis:

Consider a world in which everything is “very quantum”, and there are no easy approximations which can generally be relied on. In such a world, our human pattern-matching behavior would be really useless, and “human intelligence” in the form we’re familiar with will have no evolutionary advantage. So the only setting in which we evolve to be confused by this phenomena is one where simple approximations do work for the scales we occupy.

Sincerely, I don’t think this argument is super good. But it’s fun to propose, and maybe slightly valid.

[xtacy]

We do have a model. That’s statistical physics.

Any standard course goes over various derivations of classical physics laws (Newtonian dynamics) from quantum mechanics.

[soup10]

i started writing a response about how the human brain is designed to operate in an environment where classical physics is the norm, so we need to bridge the deviations from that if we are to really understand the world. But I don't know how much that's really true if you consider neural biology and I won't claim to know where quantum stops and classical begins as it relates to brain function.

[vonneumannstan]

>In my opinion we still don't have a logical explanation for why the model changes so dramatically from classical to quantum physics.

I think you have this backwards. QM IS the law of the universe and Classical Physics is just a high mass low energy approximation of it. In any case there doesn't need to be a logical explanation at all, the laws of physics are as they are. Why is the value of the fine structure constant what it is?