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arXiv 2302.06189math.APmath.CA
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具有奇异电磁势的Lorentz力方程的无穷多周期解

Infinitely many periodic solutions to a Lorentz force equation with singular electromagnetic potential

Alberto Boscaggin, Walter Dambrosio, Duccio Papini

摘要:

我们考虑洛伦兹力方程$$ \frac{d}{dt}\left(\frac{m\dot{x}}{\sqrt{1-|\dot{x}|^{2}/c^{2}}}\right) = q \left(E(t,x) + \dot x \times B(t,x)\right), \qquad x \in \mathbb{R}^3, $$在物理上相关的情况下,一个奇异的电场$E$。假设$E$和$B$在时间上是$T$ -周期的,并满足适当的进一步条件,我们证明了无穷多个$T$ -周期解的存在性.在非光滑临界点理论的框架下,证明了Lusternik-Schrelmann型极小极大原理.应用程序给出了一个带电粒子的运动的问题下的行动的Liénard-Wiechert潜力和相对论性强迫开普勒问题。

英文摘要:

We consider the Lorentz force equation $$ \frac{d}{dt}\left(\frac{m\dot{x}}{\sqrt{1-|\dot{x}|^{2}/c^{2}}}\right) = q \left(E(t,x) + \dot x \times B(t,x)\right), \qquad x \in \mathbb{R}^3, $$ in the physically relevant case of a singular electric field $E$. Assuming that $E$ and $B$ are $T$-periodic in time and satisfy suitable further conditions, we prove the existence of infinitely many $T$-periodic solutions. The proof is based on a min-max principle of Lusternik-Schrelmann type, in the framework of non-smooth critical point theory. Applications are given to the problem of the motion of a charged particle under the action of a Liénard-Wiechert potential and to the relativistic forced Kepler problem.

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