This is a bit "formal hocus pocus first, action later". But withing that category, it is just barely basic enough that 2021 Ciro can understand something.
Lecture notes transcribed by a student: github.com/avstjohn/qft
18 1h30 lectures.
NumPy by Ciro Santilli 40 Updated 2025-07-16
The people who work on this will go straight to heaven, no questions asked.
Scikit-learn by Ciro Santilli 40 Updated 2025-07-16
Examples under python/sklearn
. .venv/bin/activate
pip install sklearn matplotlib seaborn
Uranus by Ciro Santilli 40 Updated 2025-07-16
The first planet not known since antiquity.
Neptune by Ciro Santilli 40 Updated 2025-07-16
Quite cool how it was discoverd by the perturbation of Uranus' orbit.
Photon polarization by Ciro Santilli 40 Updated 2025-07-16
The knowledge that light is polarized precedes the knowledge of the existence of the photon, see polarization of light for the classical point of view.
The polarization state and how it can be decomposed into different modes can be well visualized with the Poincaré sphere.
One key idea about photon polarization is that it carries angular momentum. Therefore, when an electron changes orbitals in the Schrödinger equation solution for the hydrogen atom, the angular momentum (as well as energy) change is carried out by the polarization of the photon!
Video 1.
Quantum Mechanics 9b - Photon Spin and Schrodinger's Cat II by ViaScience (2013)
Source.

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