I wonder ...
30 Sep 2007 19:43:49 UTC
Topic 193189
(moderation:
I believe the data for the S5 run was taken with the detectors running at their design sensitivity. At this sensitivity current theory says gravity waves should be detectable. Also we haven't heard from Ben at all, or Bruce much lately. And Bruces's computers seem to be otherwise occupied. Bruces's Computers
I wonder if we have identified a signal and they are now doing refined analysis on it and getting their publications ready? (I hope so!)
Joe B
I wonder ...
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Interesting theory. I'd tend to put it down to Bruce being in Germany atm, but maybe you do have a point... exciting idea indeed!
RE: ..I wonder if we have
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I hope so, too! :)
And on a side note, with the publicity if that is true, it might bring in a lot more people to the project (hopefully!) to make additional discoveries!
At the pan galactic BOINC
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At the pan galactic BOINC meeting (I think this was the official title), the status of the data analysis was given as :
S3 data: analysis finished, nothing found, see link on the homepage
S4 data: analysis finished, under internal review
S5 data: post-processing not finished yet
So don't hold your breath, as the most sensitive S5 data isn't yet fully processed.
(This is from the top of my head as the boinc.berkeley.edu site where the presentation was linked is currently offline.)
CU
H-BE
RE: At the pan galactic
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Thinking about it some more, I also recall from the recent paper that there are other post-processing analyses they do as well, so Bruce's computers may just be working on another aspect of the post-data analysis.
RE: RE: At the pan
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Or, perhaps Bruce is giving the rest of us a chance to catch up with him.
Yeah, if I get a couple of
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Yeah, if I get a couple of hundred additional computers, I might :-D anyone volunteer as a sponsor?
I'm still in awe that we can
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I'm still in awe that we can even try to detect something on the order of the size of a proton with an instrument contected to the surface of a geologically active planet like our Earth. The space based instrument may have some advantages there.
I'm hoping for a positive signal though. That would be great.
RE: Yeah, if I get a couple
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Better make sure they pay your electric bill, too! ;)
RE: At the pan galactic
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I can confirm that (apart from the title actually being "3rd Pangalactic BOINC Workshop").
Some things to add:
* The sensitivity of the search is not only limited by the sensitivity of the detectors, but also by that of the search (algorithm, parameters). This is one of the reasons why we changed that algorithm for S5R2 (see Reinhard's post).
* The sensitivity of a search for continuous gravitational waves (from sources we call pulsars) increases with the "observation time", i.e. the amount of data analyzed. So far we are only analyzing roughly the first half of S5 data (S5 officially ended on 1 Oct 2007). We plan to do a search of the full S5 data for S5R4, but there are still some technical problems to overcome.
* In S5 the LIGO detectors run at their "design sensitivity", i.e. the highest sensitivity achievable with their design. Still we are not sure that there is a source of (continuous) gravitational waves near enough that we can actually detect it with the current instruments. Advanced LIGO is designed to extend the distance by a factor of ten (see "Figure 8" on Reinhard's poster).
* There are other possible sources of gravitational waves than gravitational pulsars, requiring other methods to search for their signals in the detector data than the one we use on Einstein@home. The clusters of the LSC (including "Nemo") are usually running other searches, and do help Einstein@home only when they would be idle otherwise.
BM
BM
Thanks, Bernd, that was
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Thanks, Bernd, that was really a very interesting statement. Always exciting to learn about the science behind the crunching. Don't worry, we'll be there, no matter how long it takes to finally find sth ;-)
Btw, "Nemo" is a really cool name (should have though of it when I assigned my last hostname), reminds me of both the story and the Nightwish song...