Re: [Phys-L] gravitational waves (Ludwik Kowalski)

["Donald Polvani" <dgpolvani@verizon.net>]

The two LIGO detectors (Hanford, WA and Livingston, LA) are 3002 km apart.
For a gravitational wave, traveling at the speed of light, this gives a
range of possible delay times between the two detectors of 0 to 10 ms
depending on the angle of arrival of the wave.  The observed delay time for
the September detection was 6.9 ms.  The angular position of the source is
reported as within an area of 600 deg^2 consistent with the 6.9 ms
measurement.  The experimenters say that to further pin down the angle of
arrival (and, thus, the speed of the wave) a third remote detector is
required (possibly in India?).

https://physics.aps.org/featured-article-pdf/10.1103/PhysRevLett.116.061102

Don

> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@www.phys-l.org] On Behalf Of Ludwik
> Kowalski
> Sent: Wednesday, April 13, 2016 12:44 PM
> To: Phys-L@Phys-L.org
> Subject: Re: [Phys-L] gravitational waves (Ludwik Kowalski)
>
> 1) Cavendish, who died 200 years ago, would certainly measure the speed of
> a gravitational disturbance (with his simple laboratory model), if he had
an
> ultra-fast clock, similar to clocks available to modern scientists.
>
> 2) Did LIGO scientists try to do something like this?
>
> 3)They probably did this; the mean was probably very close to c. And the
bar
> of random error was probably much smaller than 10%. Yes I am guessing
> again.
>
> Ludwik
> =======================================