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Re: Eclipse and EINSTEIN

Subject: Re: Eclipse and EINSTEIN
From: "Greg Neill"
Date: Thu, 30 Mar 2006 14:08:26 -0500
Newsgroups: sci.astro
"Jeff Root" <[email protected]> wrote in message
news:[email protected]
> Greg Neill replied to Jeff Root:
> >> > photons are practically oblivious to electric and
> >> > magnetic fields; photon-photon interactions have an
> >> > incredibly small cross section.  The interaction,
> >> > according to quantum theory is, if memory serves, a
> >> > third order effect which is practically nil.
> >>
> >> How might I coax two photons to interact?
> >
> > The simplest way is to have them do so in the
> > presence of a particle.  Alone, two photons very
> > rarely interact.
> What maximizes the probability of two photons interacting
> without a particle?  They both have to exist at the same
> time.  What else?  Should they collide perpendicularly?
> Head-on?  With the fields aligned?  Or opposed?  Or...?

I'm no expert in Quantum Theory, but my gut feeling
would be to duplicate the conditions of a matter-
antimatter annihilation in reverse, that is, have
two equal energy photons meet head-on.  I would
welcome input from more knowledgeable sources.

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