User:ShaoTang: Difference between revisions
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1,What is symmetry in physics? | 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 | 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 infinitesimally close to be trivial can be represented by a linear unitary operator that is infinitesimally close to the identity <math>U=1+i</math> | ||
2,Symmetry breaking: | 2,Symmetry breaking: | ||
Revision as of 18:37, 30 October 2011
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 infinitesimally close to be trivial can be represented by a linear unitary operator that is infinitesimally close to the identity
2,Symmetry breaking: Explicit symmetry breaking Spontanous symmetry breaking
3,Why broken symmetry in low tempreture?