Inverse Cascade of Primordial Magnetic Field in MHD Turbulence
  The feature of the spectrum of primordial magnetic field is studied by using renormalization group analysis in magnetohydrodynamics. Taking account of the renormalized resistivity at the fixed point, we show that the scaling of the typical scale with time obeys $L(t) \sim t^{2/5}$ for random initial condition. 
Tetsuya Shiromizu