Einstein, Black Holes and Cosmic Chirps - A Lecture by Barry Barish
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Albert Einstein’s theory of general relativity, developed 100 years ago, predicts the existence of gravitational waves. In February 2016, the Laser Interferometer Gravitational-wave Observatory (LIGO) became the first experiment to observe gravitational waves, created by two black holes spiraling into each other. The discovery became known as the chirp heard around the world. Four month later, a few hours before this public lecture, LIGO announced the discovery of a second signal. This lecture, given by Dr. Barry Barish, LIGO director from 1997 to 2006, explains the physics of gravitational waves, the detection technique used by LIGO, the observations made and the implications these discoveries have on our understanding of the cosmos.
Comments
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It looks just like my dog's nose...
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Actually, Eddington's data was clearly fabricated, and although that doesn't nullify the validity of GR in the least, it does mean we need to stop referring to Eddington's falsified measurements as evidence for GR - it is most certainly not.
Any amateur astronomer could tell you that an angular resolution of 0.01 arcseconds (which is what Eddington claimed when he published his results) is absurdly impossible even with the best field astronomy equipment today, much less Eddington's 19th century equipment. He published deviations of the positions of stars close to the sun before and during a solar eclipse which agreed with GR to a level of precision which was not even close to being realistically possible under the conditions of his "experiment." Eddington had also already come out publically as stating he didn't think GR needed proof and that it was self evident - the only reason he bothered to fake his data was because he wanted the fame, and unfortunately scientists are still giving him what he wanted - to the detriment of the integrity of the scientific process. -
is the delay between the two facilities always 10ms? what if the wave passes somewhere in the middle or at an angle?
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Thanks Fermilab .....
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The use or benefit of interferometers would be in the way of learning more physics and knowing in advance about the various phenomena that we might encounter coming from space. It will likely disprove dark matter and dark energy as well. Already, we have learned that black holes are more massive than previously thought (which I already knew).
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I could have told you there is a lot of room for a lot of matter involved in a black hole.
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+Fermilab Can you please add the links listed at 1:07:00 that lead to the papers (PhysRev, arXiv, etc.) that published the detections made by LIGO?
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it sort of funny when Canadians say aboot but just annoying to hear yanks say miiya although this guy better than most I will admit.😇
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how can he say interferometer with ninety percent accuracy but miyror with only fifty?
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1 - Mercury orbit is natural. due to man’s wrong understanding of planetary evolution. Einstein solution is mathematical manipulation to fit the result.
2 - Effect of Bending of starlight reflection/refraction can be shown by Newton light behaviour
3 - Arthur Eddington political remit was to confirm and win financial favour for massive British government loans. experiment was extremely poor by any standard. As USA was taking over British empire influence they continued British idea. When later Einstein was instrumental for America building the bomb. He became and is America’s extremist idol.
4 - Time dilation is normal behaviour of matter when man understand structure of matter and gravity interaction with it.
5 - Description of black hole to ignorant sound impressive, but the ignorant are too stupid to ask what elements is such body is made from knowing physical law are universal.
6 - Any one with basic intelligence know, when ever there are physical event in nature. It radiate in all frequencies. Chose a frequency call it stupid wave. Make a sensitive detector you pick it up. Billions of dollar for set of animation.
7 - You presented the talk reasonably well so I will be generous and accept some of your data. How did you eliminate effect of internal activity of Earth when you have no clue about it. I am not referring to geological, but complex activity blow lava fields and tectonic boundaries which create magnetic and gravity cycles. you did not because mankind dose not know it. MG1 -
Phenomenal lecture!
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You can't have multiple measures of time or age for the same universe. Time is an expanded fabrication and you can't use expanded time as a valid measure of historical time. Time runs at different rates in different places in the universe and there is no absolute measure of time or distance in the universe. The singularity from where we supposedly came from is no time and no space so the universe is closer to no time than it is to billions of years. You can't see into a black hole because it is literally too far away for us to see because of distance dilation or length contraction observed for the first time by way of gravitational waves.
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1:04:20 I've heard about LISA and BICEP 2 (- and this was about LIGO obviously), but now I'd like to learn about "Pulsar timing arrays"...
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Fascinating! Thanks much for posting!
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More please
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19:59
Peer review: without it, we wouldn't have String Theory. -
48:10 into the lecture he says "eV per square centimeter", instead of "eV divided by speed of light squared"... when speaking about the mass of a hypothesised graviton. How does this happen, coming from such a high profile scientist? Other than that I liked the presentation.
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48:09 Gravitons don't exist though, right? Because gravity can't both be caused by geometry AND particles... right? Or is this still extremely debated?
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