Re: Riding on a photo
From: Oz (oz_at_farmeroz.port995.com)
Date: 12/25/04
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Date: Sat, 25 Dec 2004 21:26:03 +0000 (UTC)
island5@earthlink.net writes
>An observer on a photon would see all other photons at rest, as length
>in the direction of motion would cease to exist for the co-moving
>observer, and time would slow to a complete halt, so the universe would
>be observed as a flat plane, where all events occur simultaneously,
>from the perspective of light.
I'm not absolutely sure this is a good way to see it.
A photon only interacts with events on its light cone.
It does, therefore, NOT see the *entire* universe as a 'flat plane'.
It can only ever 'see' a small slice where its lightcone intersects with
the universe.
It sees everything on its light cone as a POINT.
Although I'm not sure this would be a terribly good measure for a
photon-being.
The lightcone can be imagined as the locus of events where a photon
could be absorbed between two events: emission (at one point in
spacetime) and all possible absorption events.
But that's not a very fruitful way to see it IMHO.
There is one invariant which, it seems to me, does extend to c.
One is thus tempted to imagine that a photon-being would make use of
this invariant.
Given some *specific* photon all observers (and presumably a photon-
being) would see the same number of wavelengths between points on the
light cone.
One could thus define this number of wavelengths as a 'distance'.
Of course it isn't a 'distance' or even a 'time' for a photon-being
because he isn't really in the same space as a 'massive'-being, and
wouldn't share the same concepts or even view of the universe.
One day I might examine this concept in a bit more detail.
But, hey, I'm not smart enough ....
-- Oz
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