Comment by kornork
2 months ago
I've heard this quote before, and I don't get it. This article fails to show me just how complicated that is. When I think "complicated," I think of a multiplicity of interconnected chemical molecular processes like what must happen in the cell, or layers of recursively connected neurons in the brain. Not some mindless cloud of gluons. What they've described seems less "complicated" and more "confusing." "We don't understand this (yet?)" is a lot different than "it's possible to understand this, if your brain is really big."
It's complex in a physicist's sense of the word: the equations are hopelessly complicated to solve even in very simple cases. This means it's hard to build intuition or describe in simple terms.
Quantum chromodynamics is actually pretty similar to Maxwell's equations of electromagnetism. The big difference is that unlike photos, gluons interact with each other. This means goodbye to linear equations and simple planewave solutions. One can't even solve the equations in empty space, and only recently have supercomputers become powerful enough to make good, quantitative predictions about things like the proton mass.
I wonder if it is inherently complex in an information-theory framework, or that we simply haven’t yet found its “natural” basis under which its description is most succinct?
My thinking as well.
How could something so remarkably stable and functionally indistinguishable among its peers also be so complex?
1 reply →
A key property of QCD is that unlike electrodynamics, the forces between interacting objects increase with distance (quark confinement). This is what breaks the usual style of expansions used to simplify problems. It's hard to overstate how important this is.
One of the implications is that there are many interactions where most possible Feynman diagrams contribute non-negligibly. The advances in theory arguably have much more to do with improvements in techniques and the applied math used, such as in lattice QCD and Dean Lee's group for instance.
My non-physicist but curious-about-the-topic take is similar. Things at the quantum level are not "complex" in the systems-theory sense. They couldn't be, I think, since we're dealing with the most basic constituents of the universe. They are mysterious, confusing, wildly counterintuitive... but they are fundamental. The most basic stuff there is.
The study of these things, on the other hand, is genuinely complex and difficult. But that's epistemology, not ontology.