Universal Nonlinear Small-Scale Dynamo
  We consider astrophysically relevant nonlinear MHD dynamo at large Reynolds
numbers (Re). We argue that it is universal in a sense that magnetic energy
grows at a rate which is a constant fraction C_E of the total turbulent
dissipation rate. On the basis of locality bounds we claim that this
"efficiency of small-scale dynamo", C_E, is a true constant for large Re and is
determined only by strongly nonlinear dynamics at the equipartition scale. We
measured C_E in numerical simulations and observed a value around 0.05 in
highest resolution simulations. We address the issue of C_E being small, unlike
Kolmogorov constant which is of order unity.
