Quote:
Originally Posted by silv
Or the Ligo teams themselves:
they can try and understand why their two "rulers" measured different amplitudes in the build-up - and only during the merger-moment became quite congruent. >>image
It could be a tool's problem of one or the other Ligo - or both.
Or it might be a predictable GW behaviour, previously unthought of. Especially in the light of congruent "chirp" in the merging moment. Assuming if there was problem with the tool, the merging moment would not show up as congruent as it was, either. |
Hi Silv,
Both interferometers saw the same 'amplitude' signal. The LIGO interferometers ran at about 1/4 of their design sensitivity, as well as at the lower 'frequency range' they ran even 'more' noisier. So hence only when the merger signal (say amplitude) came above the 'nominal' noise floor of the detectors, they could see the signal. There is a bit more data analyses in there, but that is the basic limit.
If the detectors were much more sensitive in the lower frequency band (<< 1 Hz), then the orbital signal well before the merger event could be seen. This unfortunately, even at design sensitivity, is not going to happen with LIGO anytime soon..
As for the Pulsar Timing Array, that is a very interesting results. According to the models, they should have seen something and they didn't. So that says something about the models, which in turn is very interesting.