[ExI] Gravitational Waves Detected By LIGO!
johnkclark at gmail.com
Thu Feb 11 20:35:53 UTC 2016
On Thu, Feb 11, 2016 at 2:29 PM, spike <spike66 at att.net> wrote:
> back in the early 90s, when Kip Thorne and Drever and those guys were
> setting up LIGO, there were good arguments at the time, some with pretty
> convincing-looking equations in refereed papers, that GWs would never be
> detected with that technology. As I recall, the argument was that the
> interferometry techniques couldn’t get sufficient resolution to see GWs,
> which those same papers agreed are there.
And the critics were correct, the old
LIGO wasn't sensitive enough to detect gravitational waves unless you were
unrealistically lucky and 2 black holes happened to merge very near to
Earth , but after LEGO big upgrade it could detect when the distance
between 2 mirrors 2 and a half miles away changed by only 10^-18 meters
(less than one thousandth the width of a proton) and that was good enough
to get the job done.
John K Clark
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