User:ShaoTang

Collective modes and Broken Symmetry

1,What is symmetry in physics? A symmetry transformation is a change in our point of view that does not change the result of possible experiments.In particular, a symmetry transformation that is infinitesimally close to being trivial can be represented by a linear unitary operator that is

2,Symmetry breaking: Explicit symmetry breaking Spontanous symmetry breaking

3,Why broken symmetry in low tempreture?