Re: How can attraction be explained in terms of Virtual Photons ??
- From: srp@xxxxxxxxxxxx
- Date: Thu, 09 Aug 2007 07:50:47 -0700
On 9 août, 07:18, Varun <sithlordva...@xxxxxxxxx> wrote:
We know that The Coulomb force between electric charges is caused by
exchange of "virtual photons".
Well, what Feynman did in 1949 was "represent" the underlying Coulomb
force by an exchange of so-called virtual particles.
I suggest you read his original paper to really see this.
Virtual photons allow statically representing the local intensity of
force/energy at various distances between charged particles.
This allowed doing away with the Hamiltonian and using the
easier Lagrangian method. He specifically asserted:
"In many problems, for example, the close collisions of particles,
we are not interested in the precise temporal sequence of events.
It is of no interest to be able to say how the situation would look
at each instant of time during a collision and how it progresses
from instant to instant."
Ref: "Space-Time Approach to Quantum Electrodynamics",
Phys. Rev. 76, 769 (1949) page 771
So, he didn't care much about really representing the continuously
progressive Coulomb force.
In symmetric 3-dimensional space this
exchange results in inverse square law for force.
The Coulomb force does, even without the virtual photon
representation.
We can say that the particles exchange "virtual photons" which carry
the transferred momentum.
By this we can understand Attraction and Repulsion .
2 Electrons Repel by the exchange of Virtual photon . The particle
that emits the virtual photon loses momentum p in the recoil, and the
other particle gets the momentum.
I fail to see how this could explain anything other than stationary
state.
My Question is
1> Does 2 Protons also Repel by the same process because proton isnt a
point particle .
2> How this picture of virtual particles can possibly result in
attractive forces ?? How can Attraction be explained using Virtual
Photons , possibley attraction between an electron and a proton ???
I think it can't be done.
The virtual photon approach can only give static momentary states
of energy-force intensity.
André Michaud
.
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