🚀 go-pugleaf

In article <sehari.713428190@vincent1.iastate.edu>, sehari@iastate.edu (Babak Sehari) writes:
> In <l81lk0INNdu4@pollux.usc.edu> srobiner@pollux.usc.edu (Steven Robiner) writes:

> 
>>But what happens when a photon hits another photon?  Do they
>>bounce off each other, or pass right through each other?
> 
> In order for something "hitting" another thing, it should have defined size
> and defined location.  Now could you tell us, how big is a photon or where
> exactly is located.  Since, we know the velocity of photon very accurately,
> we can not tell it's position to begin with.  Neither, a photon has a size.
> A photon might be as big as the whole solar system, or as small as an atom.
> What we have here is the interaction with electron and interaction with
> another photon.  A proton's interaction with another photon causes
> destructive and/or constructive interference.
> 
>                       With highest regards,
>                            Babak   Sehari.
>  

What about this interaction?
                    <-
--------------+--------------
gamma ->      |           e+
              ||                gamma + gamma -> e+ + e-
              |V
              |
--------------+--------------
gamma ->            ->    e-

True, one of the gammas is often a virtual photon, but hey...

Cheers,
Sam Silverstein