David on Quantum mechanics

“Quantum theory was split up into dialects. Different people describe the same experiences in remarkably different languages. This is confusing even to physicists.”

“Unlike Newton's mechanics, or Maxwell's electrodynamics, or Einstein's relativity, quantum theory was not created—or even definitively packaged—by one individual, and it retains to this day some of the scars of its exhilarating but traumatic youth. There is no general consensus as to what its fundamental principles are, how it should be taught, or what it really "means." Every competent physicist can "do" quantum mechanics, but the stories we tell ourselves about what we are doing are as various as the tales of Scheherazade, and almost as implausible.”

“The entire universe must, on a very accurate level, be regarded as a single indivisible unit in which separate parts appear as idealisations permissible only on a classical level of accuracy of description. This means that the view of the world being analogous to a huge machine, the predominant view from the sixteenth to nineteenth centuries, is now shown to be only approximately correct. The underlying structure of matter, however, is not mechanical. This means that the term "quantum mechanics" is very much a misnomer. It should, perhaps, be called "quantum nonmechanics".”

“I argue that what breathes fire into the QM equations is field-theoretic what-it's-likeness: "microqualia" to use a philosopher's term of art. The different values of the solutions to the ultimate physical equations exhaustively yield the abundance of different values of subjectivity. There is no room for dualism; "nomological danglers"; causally inert epiphenomena; classical, porridge-like lumps of otherwise insentient but magically mind-secreting matter, etc. There is no "explanatory gap" because there aren't any material objects - not even brains or nerve cells as commonly (mis)perceived. Instead, over millions of years, non-equilibrium thermodynamics and universal, (neo-)Darwinian principles of natural selection have contrived to organise a minimal and self-intimating subjective sludge of microqualia into complex functional living units. Initially, these units have taken the form of self-replicating, information-bearing biomolecular patterns. Eventually, selection-pressure has given rise to complex minds as well, albeit as just one part of the throwaway host vehicles by which our genes leave copies of themselves. Conscious mind, on this proposal, is a triumph of organisation: our egocentric virtual worlds are warm and gappy QM-coherent states of consciousness. Contra materialist metaphysics, sentience of any kind is not the daily re-enactment of an ontological miracle. Moreover the idea that what-it's-like-ness is the fire in the equations is (at least) consistent with orthodox relativistic quantum field theory - because the theorists' key notions (e.g. that of a field, string, brane, etc) are defined purely mathematically. In other cases, they readily lend themselves to such a reconstruction. Using the word "physical" doesn't add anything of substance.”