[time-nuts] Nature: Hyper-precise atomic clocks face off to redefine time
hmurray at megapathdsl.net
Sat Jun 6 03:04:56 EDT 2015
richard at karlquist.com said:
> Can someone explain to me how this is going to work in light of the fact that
> each clock is in a different gravitational field?
They just shift from measuring time to measuring gravity. :)
Time too good to be true
By Daniel Kleppner
Speaking of gravity...
A few weeks ago, I went to a talk on LIGO. If you ever get a chance to hear David Reitze, grab it. He's good. He's got a talk on YouTube, but it's several years old.
These are the guys trying to detect gravity waves. If you think time-nuts are nutty...
They are looking for the chirp as a pair of neutron stars or black holes spiral into each other. Their signal is in the ballpark of 1 kHz. Their typical frequency plot is full of spurs.
During the talk, he said their laser was stable to 1E-23
That caught my attention. After the talk I asked. The response was roughly: "That's only for a few seconds. At DC it wanders all over the place."
Their resonator is 4 km long.
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