  Spin-glass and chiral-glass orderings of a three-dimensional isotropic
Heisenberg spin glass are studied both by equilibrium and off-equilibrium Monte
Carlo simulations with emphasis on their dynamical aspects. The model is found
to exhibit a finite-temperature chiral-glass transition without the
conventional spin-glass order. Although chirality is an Ising-like quantity
from symmetry, universality class of the chiral-glass transition appears to be
different from that of the standard Ising spin glass. In the off-equilibrium
simulation, while the spin autocorrelation exhibits only an interrupted aging,
the chirality autocorrelation persists to exhibit a pronounced aging effect
reminiscent of the one observered in the mean-field model.
