Matti Pitkanen (email@example.com)
Thu, 20 May 1999 07:09:15 +0300 (EET DST)
On Thu, 20 May 1999, Hitoshi Kitada wrote:
> Dear Matti,
> > Dear Hitoshi,
> > thank you very much for seing the trouble of explaining: I will
> > read your comments carefully.
> > There is still one question! Frieden considers also
> > Maxwell action with action density B^2-E^2.
> He considers vector potential (A,phi) as the parameter and defines B and E
> by using the vector.
> My guess
> > was that this decomposition corresponds to I-J decomposition
> > of action and would be thus noncovariant.
> This procedure in Frieden is complicated and I do not feel any justification
> for what Frieden is doing. It looks just an ad hoc procedure so that Frieden
> gets the Maxwell equation. He assumes several types of axioms that give the
> wanted equations, and I do not find any reasons for the axioms.
> I might well be
> > wrong. The example of scalar field suggests that I am.
> > Perhaps you could tell whether my interpretation is
> > correct or not: if not, does this mean that the term J
> > is totally absent for Maxwell action?
> Frieden considers J, but I cannot understand why such a messy treatment of J
> is necessary.
What I thought was that integral of B^2 might correspond to
I and integral of E^2 might correspond J. But it seems that this
kind of interpretation is not possible. Thank You in any case.
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