On 2/13/2014 2:55 PM, LizR wrote:
I didn't really imagine that an acceleration-caused event horizon warps space (particularly since it will, I think, generally be a long way from the accelerating observer?) I wouldn't imagine that acceleration in itself warps space...? But I /do /seem to recall that the accel-caused EH emits Hawking radiation, which is ... interesting, at least.
Sort of. It's called Uruh radiation. It's frame dependent in that the guy accelerating sees the vacuum as a thermal bath and can detect it, but to the guy not accelerating it appears that the detector is emitting the radiation it registers. Robert Wald has a thorough discussion of the phenomena. Its somewhat controversial and there have been proposals to detect its effect on highly accelerated particles in cyclotrons.
Brent
On 14 February 2014 11:31, Jesse Mazer <[email protected] <mailto:[email protected]>> wrote:In this case the horizon is basically just the edge of a light cone, and a continuously-accelerating observer can indefinitely avoid crossing into this light cone (see the top diagram at https://en.wikipedia.org/wiki/Rindler_coordinates -- x=0 is the edge of the light cone, while the curve labeled x=0.2 would be the worldline of such an accelerating observer, similarly with x=0.4, x=0.6 etc.) Naturally any light cone behaves like an event horizon in the sense that once you cross into it, there's no way to ever get out of it without moving faster than light. But such a "Rindler horizon" is not considered a true event horizon, if I remember the terminology correctly--an event horizon is specifically defined as a boundary between points where all worldlines crossing through those points are guaranteed to hit a singularity, and points where some worldlines can avoid doing so forever. Jesse On Thu, Feb 13, 2014 at 4:56 PM, meekerdb <[email protected] <mailto:[email protected]>> wrote: The event horizon due to acceleration is just relative to the one accelerated. I doesn't warp space, so there's no reason it should interact with anything. Brent
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