Acoustic phonon as a goldstone mode

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is there any book discussing goldstone mode?

i am not very familiar with field theory. Could anyone suggest some books accessible to a non-field-theory theorist?

i guess the acoustic phonon is a goldstone mode but the optical phonon is not.

Since a goldstone mode is associated with a broken symmetry and for a N-dim solid, N translational symmetries are broken, there are N and only N acoustic modes.
 

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