Sagittarius A-Star's latest activity

I think in the free theory vacuum, the refraction index ##n = \sqrt{\varepsilon_r \mu_r}## must be ##1##. If this were not the case...

To come closer back to the thread-topic: I found the following Wikipedia article about QED vacuum. Source...

Applying the Hedge dual in this way switches the interior derivative of the field between electric and magnetic sources (zero, because...

Consider the inhomogeneous Maxwell equations in (3+1) notation (Gaussian CGS units) with electric charge-density and electric...

Even more elegantly: https://www.vttoth.com/CMS/physics-notes/123-the-electromagnetic-field-tensor Thanks Bill

That's correct. However, for certain scenarios the electric force on a test-charge in it's rest-frame can transform into a pure magnetic...

I think you haven't quite caught the point here. We know why ##c## has the value it has - because when we picked some artifact and...

We could phase the question like this. Human beings are on the scale of 1-2 metres. And the human heart beats about once per second...

That's one aspect. Another is, that 4D-notation makes the relativistic structure of Maxwells equations obvious. This is also valid for...

Derivation of the EM wave function (a linear, second-order partial differential equation) from Maxwells equations in (3+1) notation...

Yes. The RHS of the wave function contains a 2nd derivative for ##ct##. In SR, ##t## is multiplied with ##c## as conversion factor. You...

In 4D-spacetime ##(ct, x, y, z)##, the EM field is a bivector. It has 6 components (3 electric + 3 magnetic), which are projections on...

That 1) and 2) are equivalent can be seen in Gaussian CGS units. Maxwells equations contain partial derivatives for ##ct## of the...

In his ether paper, Maxwell proposed to repeat Ole Roemer's measurement of the speed of light two times with an interval of 6 months...

He regarded them to be strictly valid only in the ether frame.