Covariant Maxwell Equations in Materials

AI Thread Summary
The discussion revolves around finding the covariant Maxwell equations in materials, particularly one that correctly represents non-homogeneous Maxwell equations. The user has already derived one equation but seeks another, noting difficulties in locating resources like Landau's book and a problematic Wikipedia article. References to "Foundations of Electrodynamics" by P. Moon and D. E. Spencer are made, highlighting the complexity introduced by Lorentz Transformation on physical parameters. Another suggestion includes Post's "Formal Structure of Electromagnetics," with a caution that the user's equation may be specialized and overlooks aspects like spatial dispersion. The conversation emphasizes the challenges in accessing comprehensive literature on the topic.
EsPg
Messages
17
Reaction score
0
Hi everybody,

I have this simple question. ¿Where can I find the covariant maxwell equations in materials?. I've already one and proved they correctly represent the non-homogene maxwell equations, is this one

\partial_{\nu}F^{\nu\mu}+\Pi^{\mu\nu}A_{\nu}=J^{\mu}_{libre}

with the tensor defined as

\Pi_{\mu\nu}&=\chi_e(\eta_{\mu\nu}\partial^2 -\partial^{\mu}\partial^{\mu})-\de{\chi_e+\frac{\chi_m}{1+\chi_m}}\eta_{\mu l}\eta_{\nu m}(\delta_{lm}\bigtriangledown^2-\partial_{l}\partial_{m})

I need the other one. Thanks!
 
Physics news on Phys.org
¿Nobody? I've been checking Landau's book but i can't find them :'(. There's a Wikipedia article but it's all messed,maybe after this and on vacation I fix it.
 
They're described and analyzed here: "Foundations of Electrodynamics" by P. Moon and D. E. Spencer.

But the whole situation becomes extremely messy as most every physical parameter including permittivity and permeability becomes skewed due to the attempt to accommodate the Lorentz Transformation.
 
PhilDSP said:
They're described and analyzed here: "Foundations of Electrodynamics" by P. Moon and D. E. Spencer.

But the whole situation becomes extremely messy as most every physical parameter including permittivity and permeability becomes skewed due to the attempt to accommodate the Lorentz Transformation.

Thanks. The problem is that i haven't been able to check that book, it's neither in the library nor online. ¿Any other place?
 
You may be able to get some insight from Post's "Formal Structure of Electromagnetics".
 
I think the other one is identically equal to the equation in vacuo.
However, your equation does seem to be rather specialized. E.g. , a splitting into chi_e and chi_m seems only to be true in linear electrodynamics of non-chiral materials. Furthermore, it neglects spatial dispersion. All is discussed very well in the book of Landau.
 
This is from Griffiths' Electrodynamics, 3rd edition, page 352. I am trying to calculate the divergence of the Maxwell stress tensor. The tensor is given as ##T_{ij} =\epsilon_0 (E_iE_j-\frac 1 2 \delta_{ij} E^2)+\frac 1 {\mu_0}(B_iB_j-\frac 1 2 \delta_{ij} B^2)##. To make things easier, I just want to focus on the part with the electrical field, i.e. I want to find the divergence of ##E_{ij}=E_iE_j-\frac 1 2 \delta_{ij}E^2##. In matrix form, this tensor should look like this...
Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'
Please can anyone either:- (1) point me to a derivation of the perpendicular force (Fy) between two very long parallel wires carrying steady currents utilising the formula of Gauss for the force F along the line r between 2 charges? Or alternatively (2) point out where I have gone wrong in my method? I am having problems with calculating the direction and magnitude of the force as expected from modern (Biot-Savart-Maxwell-Lorentz) formula. Here is my method and results so far:- This...
Back
Top