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View Full Version : First Observational Evidence of Gravity Waves?



Drunk Vegan
2012-Aug-29, 07:40 PM
Saw this posted on UT:

http://www.universetoday.com/97107/effects-of-einsteins-elusive-gravity-waves-observed/

Well, I know enough about physics to know this is big news, but not enough to know *why* it's big news. What implications does this have for currently competing theories in physics?

(If there's another thread started about this other than Fraser's auto-bot thread I couldn't find it, please feel free to merge this one if needed.)

antoniseb
2012-Aug-29, 08:18 PM
This is news because observations matched previous predictions on something that so far hasn't been easy to observe.
This is not so much BIG news because a similar observation was made on a pair of co-orbiting pulsars several years ago.
Still, it is very cool. Currently reducing the duration of the orbit by one second every 3000 years (give or take), and in less than a million years most likely they will merge and probably be a type 1a sn.

StupendousMan
2012-Aug-29, 11:26 PM
This is not so much BIG news because a similar observation was made on a pair of co-orbiting pulsars several years ago.


Right. The binary pulsar 1913+16, which produced results which tested GR as far back as 1982

http://adsabs.harvard.edu/abs/1982ApJ...253..908T

or even earlier.



Still, it is very cool.


Agreed!

undidly
2012-Sep-06, 11:06 AM
The Earth /moon system is spiraling out.
The binary pulsar pair is spiraling in for maybe a similar reason.
All we can tell from the inspiral is that energy is being lost.
A nearby mass would have its position modulated at the pair spin rate.That takes energy from the pair.
There is no nearby mass but there are far away masses,the whole of the universe.
Gravitational waves not needed.

Cougar
2012-Sep-06, 12:18 PM
The Earth /moon system is spiraling out.
The binary pulsar pair is spiraling in for maybe a similar reason.

There's no "maybe" about your being wrong about this.

undidly
2012-Sep-08, 02:33 AM
If the Earth was spinning the other way then the moon would spiral in.
Do they know the direction of the pulsar spins or just assume everything is in the same direction.