Wednesday, June 25, 2014

quasiparticles - Phonon carries zero spin. Why?


photons and phonons both have polarization, we attribute spin 1 for photons but spin 0 for phonons. Why?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...