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An accelerated versus non-accelerated reference frame will disagree as to whether a particle detector registers a particle, so someone in an accelerated reference frame will detect particle merely by the virtue of the fact they are accelerating. This is called Unruh radiation. Due to the equivalence principle, you will have the same thing in a gravitational field. This is called Hawking radiation. It's such a tiny effect, it's only meaningful to talk about it in the context of black holes. Jeffery Winkler http://www.geocities.com/jefferywinkler
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