Darren New <dne### [at] sanrrcom> wrote:
> "Spin" is a fascinating concept related to symmetry. A "spin 1/2" particle
> means if you turn it 180 degrees, it looks the same. So a "two of diamonds"
> playing card would be "spin 1/2" - it looks the same right side up as upside
> down. (Discounting, of course, that it's 3D, so has a back that's different
> from the front.)

IIRC it's just the other way round - so you have to turn quite a lot of
subatomic particles around twice to get them look the same again...?


> It's lost because it cannot influence other particles in the local area. Of
> course, that's because the particles outside the horizon are a spacelike
> distance from the particles inside the horizon, so maybe you're right. Maybe
> it's the equivalent of being outside the cosmological horizon.

Does there exist such a thing? It doesn't have this "one way ticket" thing to it
like black holes do.

AIUI the cosmological horizon is just the distance we can see *now*. Everything
beyond will become visible to us over time. Theoretically speaking.

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