A classical harmonic oscillator has energy given by $\frac{1}{2m}p^2+\frac{1}{2}kx^2$. This means its Boltzmann factor is
$$e^{-\frac{\beta p^2}{2m}}e^{-\frac{\beta k x^2}{2}}$$
where $\vec{x}$ and $\vec{p}$ are the continuous position and momentum vectors, respectively. The partition function should therefore be given by
$$Z=\int e^{-\frac{\beta p^2}{2m}}d^3\vec{p}\int e^{-\frac{\beta k x^2}{2}}d^3\vec{x},$$
but it is stated in my course homework that the partition function is instead
$$Z=\frac{1}{h^3}\int e^{-\frac{\beta p^2}{2m}}d^3\vec{p}\int e^{-\frac{\beta k x^2}{2}}d^3\vec{x}.$$
Some sources online have instead a factor $\frac{1}{h}$ but without any justification. Either way, I cannot see how $h$ enters into this calculation. Where does it come from?
Best Answer
Classical partition function is defined up to an arbitrary multiplicative constant. dividing it by $h$ is done traditionally for the following reasons:
And many textbooks do explain this.