Journal
ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
Volume 154, Issue 4, Pages 297-324Publisher
SPRINGER
DOI: 10.1007/s002050000101
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In this paper we study a class of Lorentz invariant nonlinear field equations in several space dimensions. The main purpose is to obtain soliton-like solutions. These equations were essentially proposed by C. H. DERRICK in a celebrated paper in 1964 as a model for elementary particles. However, an existence theory was not developed. The fields are characterized by a topological invariant, the charge. We prove the existence of a static solution which minimizes the energy among the configurations with nontrivial charge. Moreover, under some symmetry assumptions, we prove the existence of infinitely many solutions, which are constrained minima of the energy. More precisely, fur every n is an element of N there exists a solution of charge n.
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