ConradDJ
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apeiron said:How does this square with QM as a sum over histories story? One history emerges as a result of a collapse of the wave function. But all the other shadowy histories exist in a way that contributes to the final outcome as QM corrections.
So yes, there is a one-to-one story here in that one particle may emit a photon, another absorbs it. Each changes state in a well defined way. But then QM is also non-local. There is a global aspect to collapse. An event has to feel out the context of all the possible histories to settle on then the most probable actual history...
The you-you dyad breaks down rather radically as two particles exchanging a photon are actually embedded in a relationship with a larger system.
Yes, there’s no question that dyadic relationships can only communicate information within a larger context. But I don’t think the local/global dichotomy is very helpful for understanding how this works. In the world I experience, I don’t find anything “global” – though my local environment has many different aspects on different scales in space and time. And the same seems to be true of the atom’s world.
I think that to understand physics, we need to understand what each kind of relationship (electromagnetic, gravitational, etc.) contributes to this communicative environment. So I’m not trying to uncover a universal “logic” of communication, but rather to understand how this system of very diverse kinds of contexts evolved – such that for every parameter of every “field” or “particle” there’s an interaction-context that measures it, and makes it available as part of the background-context for the measurement of different parameters.
Even in your system, I believe you need quite a few different dichotomies to make a world. You’re looking to unify the system by pointing to an underlying dynamic that’s essentially the same for all of them. But my guess is that in physics as in biology, each component structure has a unique role to play, and therefore its own “logic”.
It seems that at the fundamental level, in physics, all interaction is dyadic and momentary. So the basic issue for me is, how does a web made of moments of one-on-one connection evolve into an environment that supports long-term spatial relationships between points of view that persist over time? Evidently this involves many kinds of “universal principles” that we can think of as providing “global” constraints. But even the universal “laws” have to be meaningful (measurable) in terms of local interaction-contexts.
As to the peculiar character of QM – it describes a basic “quantum vacuum” made of “virtual events” that obey no laws, in which no conditions or parameters are definable. So let’s say any kind of “event” can happen at this base level. But apparently the only events that can become part of the “real” world that we (or anything else) can actually “observe” are dyadic interactions... and specifically, one-on-one connections between events that connect to other such events. Events that don’t connect, don’t participate, remain part of the indeterminate background.
Then of all the possible events in this web of momentary connections, only those can be part of an observable world that also happen to participate in certain “lawful” patterns in the web, which make a context for defining each other.
So basically I’m imagining that all the “laws” and “global constraints” in physics arise by chance, as the conditions that define this informational environment. In a given interaction, everything happens – but only insofar as the interaction happens to “obey” the laws (in a context of other interactions that happen to obey the laws) can it be “determinate” (and participate in the evolving context that let's other events be “observed”).
As to “non-locality” – first, my “local” context doesn’t include only what’s “near by” in space. When I see a star, I’m participating in an interaction over several light-years. But I’m not connecting with anything “global”.
Second, QM does not describe any interaction over space-like intervals, only correlations between otherwise random measurements. So QM describes “patterns” in the interaction-web that are essentially different from the light-cone structure given in Relativity. Again, I don’t see anything “global” here, only very radical differences in the kinds of patterns that are apparently needed to define what happens in the world.
So yes, clearly the “laws of physics” are “global” in the sense of “universal”. But I think they arise not out of the logic of dichotomy, but out of the complicated conditions that have evolved to let information be defined “locally” and communicated between local viewpoints.