 Lieb-Robinson bound

A Lieb-Robinson bound limits the commutator of initially separated local observables by $\Vert [A(t),B]\Vert \le C\Vert A\Vert \Vert B\Vert e^{-\mu (d-v|t|)}$. It gives local lattice dynamics an effective causal cone with Lieb-Robinson velocity $v$.