Roberto Pavani's latest activity

There are two kinds of lasers, continuous wave (CW) and pulse. Since you're thinking of CW, that is what I will address. Most CW...

Agreed. And more generally by Dirac's equation for relativistic particles. The entanglement is already in the formalism, no extra axiom...

It is. If you take some wavefunction, in which there is no entagelment between particles, and fitting hamiltonian for particles in this...

Certainly. The potentials are often more direct, convenient, or easier.

If you meant the (magnetic) 3D-vector potential ##\vec A##, yes, I think in the lab frame it comes mainly via the magnetic field ##\vec...

Yes, I think I was expressing roughly the same thing in a less rigorous way. Thank you for the precise formulation. What I was...

They are caused by electromagnetic forces, not by ##A## itself. In 4D-Spacetime Algebra, the electromagnetic field bivector is...

It seems to me that the deformation forces are all caused by ##\nabla A## ?

This is an interesting link. I think a convincing explanation is the following, because a magnetic field only from the moving part of...

You're right, I overstated the symmetry, B is not zero at the bar. My mistake. Still, I notice that explaining the force on the bar...

Is this the scenario? https://kirkmcd.princeton.edu/examples/hairpin.pdf

@Dale I've found an interesting link: http://www.ampere.cnrs.fr/histoire/parcours-historique/lois-courants/force-obsolete/eng...

The symmetry I refer to: current approaches the bar through one trough and leaves through the other, in opposite directions. These two...

I'd like to share an observation and ask if others find it compelling. Consider a current-carrying loop that tends to expand. This...

Apparently birds warm their feet on bare wires. Maybe their bodies are actually being dielectrically heated by the AC field near the...