Solving "If the Photon Had Mass m" Problem with Gauss' Law

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SUMMARY

The discussion centers on the implications of a hypothetical scenario where photons possess mass "m". It concludes that if photons had mass, Gauss' Law would not hold true due to the alteration of the electric potential, represented as V(r) = e/r exp(-mc/h * r). The relationship between the electric field E and the potential φ changes, as E = -∇φ, leading to a violation of the wave equation in the Lorenz gauge. Instead, the potential would need to satisfy the Klein-Gordon equation, indicating a fundamental shift in electromagnetic theory.

PREREQUISITES
  • Understanding of Gauss' Law in electrostatics
  • Familiarity with the concept of electric potential and its mathematical representation
  • Knowledge of the Klein-Gordon equation and its significance in quantum mechanics
  • Ability to work with spherical coordinates in mathematical physics
NEXT STEPS
  • Study the implications of mass on electromagnetic theory and Gauss' Law
  • Learn about the Klein-Gordon equation and its applications in quantum field theory
  • Explore the mathematical derivation of electric potential in various coordinate systems
  • Research the differences between wave equations and the Klein-Gordon equation
USEFUL FOR

Physicists, students of theoretical physics, and anyone interested in the foundations of electromagnetism and quantum mechanics.

saleem
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hi

I have this question, I need your help:

If the photon had mass "m" , show that the Gauss' law would no longer be true.
Note that the electric poential for a point charge would then have a form
V(r) = e/r exp ( -mc/h * r )

Thank you
 
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Gauss law holds because [itex]\nabla E = 4 \pi \rho[/itex] with [itex]E = - \nabla \phi[/itex]. In case of electrostatics (no time dependence) this condition is the same than the wave equation of [itex]\phi[/itex] in the Lorenz gauge. Now the point is that if the photon had mass [itex]\phi[/itex] would not longer satisfy a wave equation but a Klein-Gordon equation. For the second part of the exercise, rewrite the Klein-Gordon equation in spherical coordinates and integrate to find [itex]\phi[/itex].
 

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