Abstract
The stability of uniform textures in superfluid /sup 3/He-A is studied with the phenomenological equations of orbital dynamics. For a fixed applied magnetic field, the texture becomes dynamically unstable at a critical current that depends both on the field H and on the angle chi between the flow and the field. In addition, the instability signals a deformation with a finite wave vector (not, in general, parallel to l) that also depends on H and chi. Beyond thresholds, the unstable amplitude does not saturate at some nearby small deformation but instead experiences catastrophic nonlinear growth. Comparison with recent observations suggests other possible experiments.
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