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Physics Note

Recommendation: 【Physics】 Physics Index



1. Celestial bodies

⑴ Alpha Centauri: 4.37 light-years from the Solar System.



2. Fluid Dynamics

⑴ Langevin dynamics: predicts molecular motion at each time step and can be run in reverse.



3. Baryon asymmetry problem

⑴ Sakharov’s condition

① baryon number violation

② C abd CP symmetry violation

③ departures from thermal equilibrium



4. Ising model

⑴ The Ising model (1920s) is a foundational physics model for ferromagnetism.

⑵ It consists of a lattice of spins (like tiny magnets) which can be in one of two states : +1 or -1.

⑶ Each spin interacts with its neighbors, tending to align to minimize overall energy.

⑷ Hopfield saw the parallels of Ising model and neurons

① neuron : spins

② synaptic weight : interaction strength

③ “My knowledge of the spin-glass lore and a little neurobiology led to the first paper in which I used the word neuron. … is the most cited paper I have ever written.” - John J. Hopfield



Input: 2024.09.23 13:57

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