Pointlike particles and the emergence of classicality

DMuitW
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I've got some conceptual problems on how to interpret the emergence of a classical world, in which, i can't walk through walls, by what is in quantum mechanics described as dimensionless energy 'particles' who have manifested themselves out of the collapse of the wave function (by whichever process, decoherence, measuring,...)

Can anyone enlighten me on this subject? thanks
 
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DMuitW said:
I've got some conceptual problems on how to interpret the emergence of a classical world, in which, i can't walk through walls, by what is in quantum mechanics described as dimensionless energy 'particles' who have manifested themselves out of the collapse of the wave function (by whichever process, decoherence, measuring,...)

Can anyone enlighten me on this subject? thanks

The particles have forces acting between them - quite strong forces. When you try to push your hand through the wall you are trying to move these powerful force configurations to a higher energy state. That takes a lot of work!
 
So, actually, mass is just an illusion that we perceive as pointlike charges who interact on their environments through forces?
 
No, mass is not an illusion. It can be sort of classified as a quantity analogous to charge for gravity, except for the always attractive nature of the gravitational force.

Tunneling is improbable for one electron; in order for you to walk through a wall, you'd need to have every single particle in your body spontaneously tunnel through the wall and return to the original configuration. Although this might happen, the probability of its happening is zero.

Essentially, the classical regime appears because certain states are more probable than others, and when we get into large action (as in the \int_{t_0}^t' L(\dot{q}, q, t) dt action) certain paths and actions become more probable. These are the "classical paths" that are returned from quantum mechanics. There's some degree of detail of "deriving" classical mechanics from the path integral formulation of quantum mechanics in any book that discusses path integration.
 
I read Hanbury Brown and Twiss's experiment is using one beam but split into two to test their correlation. It said the traditional correlation test were using two beams........ This confused me, sorry. All the correlation tests I learnt such as Stern-Gerlash are using one beam? (Sorry if I am wrong) I was also told traditional interferometers are concerning about amplitude but Hanbury Brown and Twiss were concerning about intensity? Isn't the square of amplitude is the intensity? Please...
I am not sure if this belongs in the biology section, but it appears more of a quantum physics question. Mike Wiest, Associate Professor of Neuroscience at Wellesley College in the US. In 2024 he published the results of an experiment on anaesthesia which purported to point to a role of quantum processes in consciousness; here is a popular exposition: https://neurosciencenews.com/quantum-process-consciousness-27624/ As my expertise in neuroscience doesn't reach up to an ant's ear...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA

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