Physics of Free Will

Physicist, Sean Carroll, gives Robert Lawrence Kuhn his take on free will. I was notified about this when it was posted, and given the topical subject matter, I took the 8-odd minutes to listen to it straight away.

I wish I had been there to pose a follow-up question because, although he provided a nice answer, I feel there was more meat on the table.

Like me, Sean is a Determinist who feels that the question of determinism versus indeterminism is beside the point, so we’ve got that in common. Where I feel we may diverge is that I am an incompatibilist and Sean is a compatibilist. I could be interpreting his position wrong, which is what the follow-up question would be.

I say that Sean is a compatibilist because he puts forth the standard emergence argument, but that’s where my confusion starts. Just to set up my position for those who don’t prefer to watch the short clip, as a physicist, Sean believes that the laws of physics, Schrödinger’s equation in particular.

We have an absolutely good equation that tells us what’s going to happen there’s no room for anything that is changing the predictions of Schrödinger’s equation.

— Sean Carroll
Schrödinger’s Equation

This equation articulates everything that will occur in the future and fully accounts for quantum theory. Some have argued that quantum theory tosses a spanner into the works of Determinism and leaves us in an Indeterministic universe, but Sean explains that this is not the case. Any so-called probability or indeterminacy is captured by this equation. There is no explanatory power of anything outside of this equation—no souls, no spirits, and no hocus pocus. So far, so good.

But Sean doesn’t stop talking. He then sets up an analogy in the domain of thermodynamics and statistical mechanics and the ‘fundamental theory of atoms and molecules bumping into each other and [the] emergent theory of temperature and pressure and viscosity‘. I’ve explained emergence in terms of adding two hydrogen and one oxygen atom to create water, which is an emergent molecule with emergent properties of wetness.

My position is that one can view the atomic collection of matter at a moment as an emergent property and give it a name to facilitate conversation. In this case, the label we are applying is free will. But there is a difference between labelling this collection “free will” as having an analogous function to what we mean by free will. That’s a logical leap I am not ready to take. Others have equated this same emergence to producing consciousness, which is of course a precursor to free will in any case.

Perhaps the argument would be that since one now has emergent consciousness—I am not saying that I accept this argument—that one can now accept free will, agency, and responsibility. I don’t believe that there is anything more than rhetoric to prove or disprove this point. As Sean says, this is not an illusion, per se, but it is a construction. I just think that Sean gives it more weight than I am willing to.