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arXiv 1402.0802math-phmath.MP
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变分电动力学的运动方程

Equations of Motion for Variational Electrodynamics

Jayme De Luca

摘要:

我们扩展的Wheeler-Feynman电动力学的变分问题,把电磁泛函的绝对连续的轨迹拥有一个导数(速度)的有界变化的局部空间。有限个速度间断极值的广义变分法(断裂点),我们证明了在扩展的局部空间中两体问题的临界点条件是几乎处处满足Lebesgue-always的Euler-Lagrange方程加上广义Weierstrass-Erdmann条件(i)部分动量必须是绝对连续函数和(ii)部分Lagrange量的Legendre变换(即部分能量)必须是绝对连续函数。

英文摘要:

We extend the variational problem of Wheeler-Feynman electrodynamics by putting the electromagnetic functional in a local space of absolutely continuous trajectories possessing a derivative (velocities) of bounded variation. Generalizing the calculus of variations for extrema with a finite number of velocity discontinuities (breaking points), we prove that the critical-point-conditions for the two-body problem in the extended local space are Euler-Lagrange equations holding Lebesgue-almost-everywhere plus the generalized Weierstrass-Erdmann conditions that (i) the partial momenta must be absolutely continuous functions and (ii) the Legendre transforms of the partial Lagrangians (i.e, the partial energies) must be absolutely continuous functions.

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