Lagrangian and Hamiltonian formulation of classical electrodynamics without potentials

被引:2
|
作者
Vollick, Dan N. [1 ]
机构
[1] Univ British Columbia Okanagan, Irving K Barber Sch Arts & Sci, 3333 Univ Way, Kelowna, BC V1V 1V7, Canada
来源
EUROPEAN PHYSICAL JOURNAL PLUS | 2017年 / 132卷 / 10期
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1140/epjp/i2017-11722-3
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In the standard Lagrangian and Hamiltonian approach to Maxwell's theory the potentials A(mu) are taken as the dynamical variables. In this paper I take the electric field (E) over right arrow and the magnetic field (B) over right arrow as the dynamical variables. I find a Lagrangian that gives the dynamical Maxwell equations and include the constraint equations by using Lagrange multipliers. In passing to the Hamiltonian one finds that the canonical momenta (Pi) over right arrow (E) and (Pi) over right arrow (B) are constrained giving 6 second class constraints at each point in space. Gauss's law and (Delta) over right arrow .(B) over right arrow = 0 can than be added in as additional constraints. There are now 8 second class constraints, leaving 4 phase space degrees of freedom. The Dirac bracket is then introduced and is calculated for the field variables and their conjugate momenta.
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页数:9
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