Abstract
In this paper we introduce new Lusternik–Schnirelman type methods for nonsmooth functionals including the action integral associated to the relativistic Lagrangian of a test particle under the action of an electromagnetic field
where \(V:[0,T]\times {\mathbb {R}}^3\rightarrow {\mathbb {R}}\) and \(W:[0,T]\times {\mathbb {R}}^3\rightarrow {\mathbb {R}}^3\) are two \(C^1\)-functions with V even and W odd in the second variable. By applying them, we obtain various multiplicity results concerning T-periodic solutions of the relativistic Lorentz force equation in Special Relativity,
where \( E=-\nabla _q V-\frac{\partial W}{\partial t}, B=\hbox {curl}_q\, W. \) The zero Dirichlet boundary value conditions are considered as well.
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Acknowledgements
This work is partially supported by MTM2017-82348-C2-1-P and PGC2018-096422-B-I00 (MCIU/AEI/FEDER, UE) and FQM-116 and FQM-183 (Junta de Andalucía).
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Arcoya, D., Bereanu, C. & Torres, P.J. Lusternik–Schnirelman theory for the action integral of the Lorentz force equation. Calc. Var. 59, 50 (2020). https://doi.org/10.1007/s00526-020-1711-0
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DOI: https://doi.org/10.1007/s00526-020-1711-0