What is Quantum Theory and Why Do Electrons Orbit at Specific Distances?

quantum brain
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can anyone please explain in detail what the quantum theory is and how it is different from normal physics?
 
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There are millions of good books and web sites.

And why is not quantum physics "normal" physics?
 
quantum brain said:
can anyone please explain in detail what the quantum theory is and how it is different from normal physics?
About the difference between the quantum theory and classics physics, I think that quantum physics is a theory about coherent particle, and classics physics is a theory about decoherent particle.
 
how our universe is created from some basic material ? after big bang why protons are of particuler sizes ? after some time why protons oppose its material? why electrons are at particuler distance from nuclease?
 
mehul ahir said:
why electrons are at particuler distance from nuclease?

They are?
 

Thread 'Schrödinger equation and classical wave equation'

Not an expert in QM. AFAIK, Schrödinger's equation is quite different from the classical wave equation. The former is an equation for the dynamics of the state of a (quantum?) system, the latter is an equation for the dynamics of a (classical) degree of freedom. As a matter of fact, Schrödinger's equation is first order in time derivatives, while the classical wave equation is second order. But, AFAIK, Schrödinger's equation is a wave equation; only its interpretation makes it non-classical...
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Thread 'Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect'

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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Thread 'Is Maxwell's electromagnetism an effective (field) theory?'

Is it possible, and fruitful, to use certain conceptual and technical tools from effective field theory (coarse-graining/integrating-out, power-counting, matching, RG) to think about the relationship between the fundamental (quantum) and the emergent (classical), both to account for the quasi-autonomy of the classical level and to quantify residual quantum corrections? By “emergent,” I mean the following: after integrating out fast/irrelevant quantum degrees of freedom (high-energy modes...
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