  We show an application of the functional-renormalization-group aided density
functional theory to the homogeneous electron gas with arbitrary spin
polarization, which gives the energy density functional in the local spin
density approximation. The correlation energy per particle is calculated at
arbitrary Wigner-Seitz radius $ r_{\rm s} $ and spin polarization $ \zeta $. In
the high-density region, our result shows good agreement with Monte Carlo (MC)
data. The agreement with MC data is better in the case of small spin
polarization, while the discrepancy increases as the spin polarization
increases. The magnetic properties given by our numerical results are also
discussed.
