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Old 02-11-2016, 03:38 PM   #1
Urwumpe
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Default Gravitational waves claimed to be detected by aLigo

After analysis, the aLigo team is claiming that they really measured gravitational waves with their detector on the 14th September 2015.

https://www.sciencenews.org/article/...99s-prediction

The paper about the discovery is cited as such, and has over 1000 authors (which really suggests some importance, if you need to put so many friends and pets there):

B.P. Abbott et al. Observation of gravitational waves from a binary black hole merger. Physical Review Letters. Vol. 116, p. 061102. Published online February 11, 2016. doi: 10.1103/PhysRevLett.116.061102
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Old 02-11-2016, 03:45 PM   #2
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[Edit: Nevermind, I was thinking about something else]

Last edited by boogabooga; 02-11-2016 at 04:23 PM.
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Old 02-11-2016, 03:54 PM   #3
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Its on the bbc, must be right...
http://www.bbc.co.uk/news/science-environment-35524440

N.
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Old 02-11-2016, 03:58 PM   #4
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Also around in German language, on Spiegel Online....

http://www.spiegel.de/wissenschaft/n...a-1076818.html

...and heise online:

http://www.heise.de/newsticker/meldu...h-3099654.html

And Tagesschau also believes that this was important enough for urgent news.

Last edited by Urwumpe; 02-11-2016 at 04:00 PM.
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Old 02-11-2016, 04:07 PM   #5
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Link to paper here:

http://journals.aps.org/prl/abstract...ett.116.061102

You'll have to be patient - this is being downloaded by every physicist and their grad students (and we science geeks) right now.

Last edited by Thunder Chicken; 02-11-2016 at 04:10 PM.
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Old 02-11-2016, 04:50 PM   #6
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I think the press conference is about to start ?
EDIT: I'm not sure what happened to the webcast, but I guess the conference happened or is happening.


---------- Post added at 10:50 AM ---------- Previous post was at 10:27 AM ----------

Quote:
Originally Posted by Thunder Chicken View Post
 Link to paper here:

http://journals.aps.org/prl/abstract...ett.116.061102

You'll have to be patient - this is being downloaded by every physicist and their grad students (and we science geeks) right now.
Heheh
Quote:
Until our servers are back online (we're adding more capacity now) here is figure one from the paper #LIGO


Quote:
We're coming back online...in the meantime here are figures 2-4: #LIGO



Last edited by Quick_Nick; 02-11-2016 at 04:54 PM.
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Old 02-11-2016, 05:26 PM   #7
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SO... They detected two black holes merging? Wow.
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Old 02-11-2016, 05:38 PM   #8
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Quote:
Originally Posted by MaverickSawyer View Post
 SO... They detected two black holes merging? Wow.
I hope someone will verify this but supposedly the merger very briefly produced more power than the rest of the observable universe combined ?!
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Old 02-11-2016, 05:42 PM   #9
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Hm, what makes me wonder is how the heck do they keep the noise out?
This thing measures shifts on the order of a width of a subatomic particle - one would expect that a bird crapping somewhere on the continent would produce enough of a seismic wave to be detected by this instrument.

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 supposedly the merger very briefly produced more power than the rest of the observable universe combined ?!
3 solar masses worth of energy got emitted as gravity waves alone, apparently.
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Old 02-11-2016, 07:47 PM   #10
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---------- Post added at 01:47 PM ---------- Previous post was at 01:45 PM ----------

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 3 solar masses worth of energy got emitted as gravity waves alone, apparently.
500000000000000000000000000000000000000000000000 Joules!
EDIT: Or twenty quadrillion Earth-masses worth of TNT.

Last edited by Quick_Nick; 02-11-2016 at 08:02 PM.
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Old 02-11-2016, 08:55 PM   #11
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Quote:
Received 21 January 2016
And here we see how the peer-review system is broken as in most cases publication takes 6 months, not 20 days.

---------- Post added at 09:55 PM ---------- Previous post was at 09:47 PM ----------



Cute. Meow.

This would actually be audible
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Old 02-11-2016, 09:07 PM   #12
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So how fast travel gravitational waves ? Speed of Light ?
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Old 02-11-2016, 09:26 PM   #13
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Quote:
Originally Posted by kamaz View Post
 This would actually be audible
Indeed it would. Not only are the frequencies in the right range, but it would actually cause mechanical vibrations in your body.

I just realized: This is the longest range at which an object has ever been detected by passive sonar. Shall I fire a torpedo, captain?
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Old 02-11-2016, 09:31 PM   #14
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Quote:
Originally Posted by N_Molson View Post
 So how fast travel gravitational waves ? Speed of Light ?
Probably. Measurement produced 0.95 +/- 0.25 c.

https://www.newscientist.com/article...ment-revealed/

Most physicists believe that it propagates at c, because if it moved faster (i.e. instantaneously) it would break causality, and there is no logical reason why it would move slower.

Note that this holds true only in vacuum.
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Old 02-11-2016, 09:35 PM   #15
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Quote:
Originally Posted by kamaz View Post
 And here we see how the peer-review system is broken as in most cases publication takes 6 months, not 20 days.
Good point.

Are "Review Letters" supposed to be fast-tracked early results perhaps?

I would expect that something more substantial will come out in Science/Nature in due time.
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