Long-time dynamics of the infinite-temperature Heisenberg magnet

Infinite-temperature long-time dynamics of Heisenberg model H^=-1/2tsumi,jJijS^iS^j is investigated. It is shown that the quantum-spin pair correlator is equal to the correlator of a classically evaluated vector field averaged over the initial conditions with respect to the Gaussian measure. In the continuous-limit case, the scaling estimations allow one to find the one-point correlator that turns out to be C(r=0;t)const×t-6/7. All results are obtained by straightforward procedures without any assumptions of the phenomenological character.