Re: How real are the "Virtual" partticles?

From: Eugene Stefanovich (eugenev_at_synopsys.com)
Date: 02/24/05 

Date: Thu, 24 Feb 2005 22:46:23 +0000 (UTC)

Arnold Neumaier wrote:
  For example, just as we can fly in a dream,
> virtual particles can be faster than light (since they may have
> imaginary mass)...
>

Why then everybody keep saying that interactions in QED propagate with
the speed of light? Feynman diagrams and S-matrix cannot say
anything about the speed of propagation of interaction. And the speed of
propagation of virtual particles belongs to dreams, as you correctly
pointed out.

Eugene Stefanovich