- #1

- 11

- 0

## Main Question or Discussion Point

It is well known that for an isolated system, the normal mode frequency of a N-body harmonic oscillator satisfies Det(T-[tex]\omega^{2}[/tex]V)=0. How about a non-isolated, fixed temperature system?

In solid state physics I have learned that in crystal the frequency does not change, but the amplitude of each mode changes. But how about the free energy? Shouldn't the free energy be always at the minimum?

I am confused...

Thanks so much.

In solid state physics I have learned that in crystal the frequency does not change, but the amplitude of each mode changes. But how about the free energy? Shouldn't the free energy be always at the minimum?

I am confused...

Thanks so much.