Re: LIGO.


"dlzc" <dlzc1@xxxxxxx> wrote in message
news:1170869333.336183.149110@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Dear cliff wright:

On Feb 7, 3:39 am, cliff wright <c.c.wri...@xxxxxxxxxxxxxxx> wrote:
For some years now I have from time to time kept up with
developments at the LIGO sites. Just checked again and
saw that "Gravitational waves" should be being detected
by 2005.

There are some preliminary results (2003) here:
http://www.ligo.caltech.edu/docs/G/G030003-04/G030003-04.pdf
... which you can get to from the LIGO home page.

Well it is now 2007, and I ain't heard nuthin!

What they appear to be saying is how "Enhanced LIGO" and "Advanced
LIGO" and "in combination with Virgo" these things will be
detectable. So what you should hear is "we can't detect what the
Universe is producing in quantity, with what we have".

Effectively, that is a null result - except if they found an error in the
design of their experiment. Right?

Thanks,
Harald

They are
saying that randomly they *might* detect one event a year, rather than
1 every 450 years.

Seems to me, if it is close enough to detect *in quadrature* with this
equipment, then one of our close neighbors will have gone SN. We may
not care about GW at that point, especially if gravity waves do
disperse / propagate at c.

David A. Smith



.

Relevant Pages