Two-fluid model of the Skyrmion

We consider the field-theory description of the Skyrme model incorporating quantum fluctuations of a condensed phase. This viewpoint clarifies the usefulness of the model for applications at the physical value of F/sub π/, rather than F/sub π/→infinity. By creating covariant field-theory states associated with a translational-dependent condensate, we emphasize the effects of fluctuations and coherence in a calculation of the q2 dependence of the baryon electromagnetic form factor F(q2). Using the impulse approximation at large q2, we find the model predicts F(q2)approx.exp(-Vertical Barq2Vertical Bar/lambda2)/q 2, where lambdaapprox.1 GeV is a calculable scale. Appending a pion form factor of O(1/q2), we interpret this in terms of higher-twist corrections, at moderate values of momentum transfer, to a leading term of O(1/q4). The dependence on a regularization scale μ2 and F/sub π/ 2 is such that this result applies for a specified range of q2, μ2, and F/sub π/ 2. However, the detailed results of the calculation are such that the large-F/sub π/ 2 and large-μ2 limits do not commute