Re: Eclipse and EINSTEIN

"Jeff Root" <jeff5@xxxxxxxxxxxx> wrote in message
news:1143745300.712836.75860@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

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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