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Dynamics of the order parameter of superfluid phases of helium-3The spin dynamics and the orbital dynamics in the A and B phases of superfluid 3He are analyzed. Attention is focused on solitons and instantons: nonsingular configurations of the field of the order parameter of the 3He superfluid phases. A qualitative explanation in terms of solitons and instantons is offered for several experiments involving the A and B phases of 3He. The analysis of these questions is prefaced by some general information on the order parameter and the free energy in superfluid 3He.
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