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The Science of Can and Can't: A Physicist's…
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The Science of Can and Can't: A Physicist's Journey through the Land of… (edició 2021)

de Chiara Marletto (Autor)

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Títol:The Science of Can and Can't: A Physicist's Journey through the Land of Counterfactuals
Autors:Chiara Marletto (Autor)
Informació:Viking (2021), 272 pages
Col·leccions:La teva biblioteca

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The Science of Can and Can't: A Physicist's Journey through the Land of Counterfactuals de Chiara Marletto

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Cynic Alter-Ego: “Nice SF. So now we want to explain nature without equations of motion. I will go back to study my Aristotle book. Science fiction in academy goes on. After the multiverses we go for no equations... in addition to title "Beyond Quantum Computation"... still there no real quantum computer (apart from some big claims but nothing more than 50qubits doing little tasks) and very from a real one .... but they already speak about beyond quantum computing... how these people can have success , it is a shame.”

Constructor Theory Fan: The amount of comments like this is astounding. You know you can literally read the paper pre-prints on the website, right? Nobody is suggesting to do away with equations of motions - i.e. dynamics - as a fundamental tool in the physics arsenal. The point of this theory as far as I can see, on a very rough level, is to provide a mechanism for the introduction of counterfactual knowledge into physical theories. By doing so you can reduce the size of the admissible solution space when it comes to exploring those new theories. It's not that magical or complicated... but again understanding this would require approximately 30-40 seconds of googling followed by maybe 10-15 minutes of light reading, so it is understandable that people might struggle with that.”

Cynic Alter-Ego: Well, Deutsch and Marletto claim to have new physics . A new theory , deeper than quantum mechanics, that allow to deduce things like thermodynamics. From this new physics in their papers there is no trace how you deduce Schrödinger’s or Einstein’s equations from these new principles. Neither trace on how you are expected to solve the measurement problem, so mysterious what is deeper than quantum mechanics. Neither rigorous derivation of chaos, and this makes it quite mysterious how they can derive thermodynamics. You can all ignore me but I'll warn you all here: Constructor Theory is (another) dead end like String Theory. It is asking us to be Oracles. We just cannot know what is possible and what is impossible until we know the physical laws. Even if the laws are written in Holy Granite Marble in terms of "can" and "can't" we cannot discover them efficiently without a deeper theory that derives for us what is possible to construct and what cannot be constructed (a theory of the Marble Itself, so to speak). So at best, CT is like a symbiotic living off a deeper sort of theory of physics or metaphysics, so CT is not fundamental, it is post-fundamental. But that's just MHO. Seems to me, much like QIT, this bunch of principles of CT is useful as a window onto fundamental physics, a new way of seeing the world, and that's highly valuable, but in the end it will still lead to a dead end, much like the "It from Bit" meme. It is still not clear to anyone whether a physical theory of everything, or even a sweeping neo-positivist instrumentalist view (Sabine Hossenfelder), can do without some metaphysics. To me, just my opinion, a physics theory of everything is a misnomer, it can only ever be a theory of everything physical which will always beg the question, "are there realities which cannot be described by physics and require some sort of metaphysics?" And as Noam Chomsky would say, that means things that are not in-principle mathematically describable (because once you can mathematicize a phenomena it really "becomes physics" --- you tack it on to what you now redefine as "physics".) Consciousness (the Chalmers definition at least, not the Minsky-Dennett impoverished instrumentalist definition) is a candidate for a phenomenon we "detect" that is not in-principle mathematically describable.”

Constructor Theory Fan: “Seems to me it's not true that Constructor Theory has no dynamics. You cannot get any emergence of phenomena not implicit in the system from foundations. Principle 1 of Constructor Theory says ‘Laws of physics are expressible entirely in terms of statements about which physical transformations are possible and which are impossible, and why.’ Any transformation is dynamics. What would be ‘emergent’ in Constructor Theory is time & length scale and particular laws like causality (special relativity) and the like. All that has to be implicit though in the principles. Laws cannot emerge as novelties. People misunderstand the whole idea of emergent complexity in this way. What is genuine novel emergence cannot be physical law baked into the ‘marble’, it can only be a pattern that persists for limited time, and thus is merely an approximate high-level ’aw-like’ feature of certain constrained systems (e.g., the biological "laws" of genetics, or mitosis, etc --- they're not fundamental laws of physics nor Constructor Theory because if there were no biological entities (which is conceivable) then mitosis etc., would not exist).”

Cynic Alter-Ego: “It might not even be possible to ever "scientifically prove" that the Chalmers-Gödel idea of consciousness - if we suppose it's what our subjective consciousness instantiates - is mathematically describable or not. Note to prove it so, without circularity, requires you cannot assume consciousness emerges from just brain processes, nor can you assume it doesn't. In other words it cannot be accomplished by pure logic (logic can only ever tell you the consequences of your axioms, so your axioms implicitly include an assumption about the consequences of any derivation, if you overlay a phenomenal interpretation). That in turn means you need a theory along with empirical data for a "scientific proof." That's a touch of why such a "scientific proof" might be impossible: what empirical data is ever going to be able to "prove" (when attached to a theory) that a phenomenon is mathematically describable or not? For one thing, that presumes we know, or have a meta-theory, of what is "mathematically describable." At present we do not, and likely never will. We generally only find out a complex system is mathematically describable when we find an effective description/model. We’re really in a new dark age of Stupidity.”

Constructor Theory Fan: (*sigh*)

SF = Speculative Fiction. ( )
  antao | Oct 15, 2021 |
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