Geodesic
Hydrodynamic spectrum of an antiferromagnet at low temperatures
Teoretičeskaâ i matematičeskaâ fizika, Tome 36 (1978) no. 1, pp. 99-114 Cet article a éte moissonné depuis la source Math-Net.Ru

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An expression is obtained for the statistical operator $\rho_l$ describing the local-equilibrium state of a Heisenberg antiferromagnet during the hydrodynamic stage of evolution. This expression for $\rho_l$ is used to derive the hydrodynamic equations of an isotropic antiferromagnet and easy-axis and easy-plane models in the phase with noncollinear sublattices. For low temperatures, an explicit expression is found for the thermat corrections to the spectrum of long-wavelength excitations in a wide range of external magnetic field strengths. 
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V. G. Morozov; A. N. Mukhai. Hydrodynamic spectrum of an antiferromagnet at low temperatures. Teoretičeskaâ i matematičeskaâ fizika, Tome 36 (1978) no. 1, pp. 99-114. http://geodesic.mathdoc.fr/item/TMF_1978_36_1_a8/

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