*Note: These are very loose notes and need cleaning. Scribbled down as many terms as I came over when I used Roam Research.*

- [[Action at a Distance]]

hidden variable theories", or, more generally, "local causality". Thus, Bell's theorem is often understood to imply that QM is "[[nonlocal]]", or in Bell's words: QM has a "grossly non-local character" (1964 paper).`- Good explanation also of fields [QFT: What is the universe really made of? Quantum Field Theory visualized - YouTube](https://www.youtube.com/watch?v=jlEovwE1oHI) [[../_meta/meta.source.web]] - [[Bell's Inequality]] - certain measurements are truly probabilistic and not predetermined by some hidden variables. - source:: [(2) Assuming that the Big Crunch/Big Bounce theory is true would that mean that the universe plays out exactly the same an infinite amount of times? : cosmology](https://www.reddit.com/r/cosmology/comments/jl8gh3/assuming_that_the_big_crunchbig_bounce_theory_is/) - my point was showing there exist some truly random processes in the universe - how is what happens randomly determined to become exactly that value? How can there not be #determinism ? - I don't know if you're interested, but this might be some good reading to start getting a little grasp on the notion of "randomness": - - Earman, J. (1986). A Primer on Determinism. (particularly Ch. 8.) #science #[[Quantum Mechanics]] #book - - Kolmogorov, A. N. & Uspenskii, V. A. (1988). Algorithms and Randomness. #science #[[Quantum Mechanics]] #book - - Eagle, A. (2005). Randomness is Unpredictability. #science #[[Quantum Mechanics]] #book - [[Bell's Theorem]] - Bell's theorem is commonly understood to rule out "local deterministic`

`- QM has a "grossly non-local character" (1964 paper). quote:: Bell #[[Quantum Mechanics]] - [[Eigenstate-Eigenvalue Link]] - Global phase invariance - [[Locality]] - things effect each other only when they are in the same place - Exception is #Gravity, until we find the gravity-carrying particle, or gravitational fields are real. - [[Many Worlds Interpretation]] - evades [[Bell's Inequality]] - source:: https://www.reddit.com/r/cosmology/comments/jl8gh3/assuming_that_the_big_crunchbig_bounce_theory_is/ - [[Projection Postulate]] aka [[collapse of the wave-function]] - by [[Von Neumann]] - [[Poincare Recurrence Theorem]] - [[Quantum Field Theory]] - Good explanation: [QFT: What is the universe really made of? Quantum Field Theory visualized - YouTube](https://www.youtube.com/watch?v=jlEovwE1oHI) [[../_meta/meta.source.web]] - [[Retrocausality]] - backwards causation - source:: https://www.reddit.com/r/cosmology/comments/jl8gh3/assuming_that_the_big_crunchbig_bounce_theory_is/ - [[Schrödinger]] - [[Superdeterminism]] - denying measurement inputs to be free variables - source:: https://www.reddit.com/r/cosmology/comments/jl8gh3/assuming_that_the_big_crunchbig_bounce_theory_is/ - [[Superliminal signalling]] - violating relativistic constraints - source:: https://www.reddit.com/r/cosmology/comments/jl8gh3/assuming_that_the_big_crunchbig_bounce_theory_is/`

# quote:: (and anecdotes)

(according to [[Roger Penrose]] in https://www.youtube.com/watch?v=hXgqik6HXc0 at ca. 12mins) - also in "[[Roger Penrose]] on Lex Friedman podcast 85 #Physics #consciousness"`- Schrödinger meant his cat was an absurdity - [[Quantum Mechanics]] was absurd, he felt - Dirac said - but not out loud - [[Quantum Mechanics]] is a provisional theory #quote`

`- "The lesson of quantum mechanics and even of classical physics, Popper said, is that nothing is determined, nothing is certain, nothing is completely predictable; there are only “propensities” for certain things to occur. - [[Karl Popper]], Propensities #quote #Physics #uncertainty #[[Quantum Mechanics]] #philosophy #[[philosophy of science]]"`

- "There is no such thing as a particle's position. What is the position of an ocean wave?" #quote #QM

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