Spin Glass Aging

Spin glasses have random ±J couplings — some pairs want to align, others anti-align. Since these demands cannot all be satisfied simultaneously, the system is frustrated and has an exponential number of metastable minima.

Aging: after a quench, relaxation never equilibrates — the older the glass, the slower it relaxes. Response depends on waiting time t_w. Colors here show local energy: frustrated bonds glow red. Watch energy creep downward forever, never settling.