Symmetry breaking is important.
When there is symmetry-breaking, the system goes to a low-energy state.
Each possible low-energy state can be regarded as a new “physical world”.
One “physical world” cannot jump to another, unless through quantum tunnelling. But the probability of quantum tunnelling happening is low.
Low-energy physics theories, such as harmonic oscillator, are often simple and beautiful.
— Professor Renbao Liu
— Me@2019-04-08 10:46:32 PM
2019.04.09 Tuesday (c) All rights reserved by ACHK