Stable directions for small nonlinear Dirac standing waves

Details Stable directions for small nonlinear Dirac standing waves Stable directions for small nonlinear Dirac standing waves

2005-12-16

arxiv.org/abs/math-ph/0512054v3

Physics

Mathematical Physics

62 pages

Scientific paper

10.1007/s00220-006-0112-3

We prove that for a Dirac operator with no resonance at thresholds nor eigenvalue at thresholds the propagator satisfies propagation and dispersive estimates. When this linear operator has only two simple eigenvalues close enough, we study an associated class of nonlinear Dirac equations which have stationary solutions. As an application of our decay estimates, we show that these solutions have stable directions which are tangent to the subspaces associated with the continuous spectrum of the Dirac operator. This result is the analogue, in the Dirac case, of a theorem by Tsai and Yau about the Schr\"{o}dinger equation. To our knowledge, the present work is the first mathematical study of the stability problem for a nonlinear Dirac equation.

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