LIGO Gravitational Wave Observatory
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The Laser Interferometer Gravitational Wave Observatory is spearheading the completely new field of gravitational wave astronomy and opening a whole new window on the universe. LIGO's exquisitely sensitive instruments may ultimately take us farther back in time than we've ever been, catching, perhaps, the first murmurs of the universe in formation.
Canal: Science & Technology
Añadido: November 30, 1999 at 12:00 am
Autor: BrunoTheQuestionable
Duración: 07:30
Puntuación: 4.74
Reproducciones: 45332
Etiquetas: Gravitational Interferometer Laser LIGO NSF Observatory Wave
Comentarios
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anarchopinko (November 30, 1999 at 12:00 am)
Not quite right. The mirrors are freely falling objects that will move on the massive geodesic which in turn will put the outgoing beam and the incoming beam out of phase. Johrv58, if you go through the math you will see that the time component is taken into account.
ItCameFromTheSkyBeLo (November 30, 1999 at 12:00 am)
Its not the mirrors that will change, its the lengths of the arms. that will slightly distort the waves of light.
ItCameFromTheSkyBeLo (November 30, 1999 at 12:00 am)
There not measuring the speed of light, there measuring the interference with the light waves. Two waves placed perfectly on top of each other so they the peaks and the troughs of each are opposite each other. Thus canceling each other out, the gravity waves should, as predicted by Einstein, should cause the waves to faulter and show light at the detector.
Color1377 (November 30, 1999 at 12:00 am)
humans are freaking amazing
fattoldpig (November 30, 1999 at 12:00 am)
"according to Einstein" LIGO will never ever detect a gravity wave using lasers, the speed of light changes with space-time contraction/compression and no change will be noticed by an observer who is A PART of the event.
intindse (November 30, 1999 at 12:00 am)
ah come on i wanna se the experiment
jonrv58 (November 30, 1999 at 12:00 am)
Ok. Light moves on the null geodesic. The mirrors move on timelike geodesics (being mechanically held).The light and the 'objects' are, in conventional GR, influenced differently by a gravity wave. That difference is measurable - being the point of LIGO!My point is that time WILL alter. That is 'timelike will be the equivalent of Null.Ok, nonsense? lol. we'll see.
anarchopinko (November 30, 1999 at 12:00 am)
Not quite right. You must take into account that light moves on the null geodesic while the mirrors move on massive geodesics - in other words they are affected by GWs differently. Your confusion is common and there are papers that answer this in mathematical detail using GR.
MuddleVanHeck (November 30, 1999 at 12:00 am)
That's fascinating!
jonrv58 (November 30, 1999 at 12:00 am)
So time also gets stretched. The result is that it will be impossible to detect gravity waves by LIGO. The increase in distance cannot be measured with light as an increase in distance will also stretch a second. This prediction of failure was made by myself years ago. Time will tell.
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