Temperature dependence of the spin polarization in the fractional quantum Hall effects

Using a Hamiltonian formulation of Composite Fermions that I recently developed with R. Shankar, I compute the dependence of the spin polarization on the temperature for the translationally invariant fractional quantum Hall states at $\nu=1/3$ and $\nu=2/5$. I compare my results to experiments at $\nu=1/3$ and find reasonably good agreement.