The Absurdity of Detecting Gravitational Waves on HackerTube: recommended by 3 Hacker News commenters across 2 separate months, 2017–2019.
explainer · evergreen
Veritasium explains in detail how LIGO detects gravitational waves, with a laser interferometer measuring displacements smaller than a proton. The video focuses on the extreme precision and the techniques needed rather than the general discovery story.
HN recommends it as a good layperson explanation of how LIGO's detection works and why it is so hard.
“Here is a great video with explanations”
6 Hacker News comments link this video. Each one links back to its thread.
There are many good videos on youtube that do a good job explaining what gravitational waves are and how we detect them. Many of these were made in response to the first detection, and they do a pretty good job explaining it in laymans terms. I personally really like veritasiums video here. ▶ this video
in “Gravitational waves from a binary black hole merger observed by LIGO and Virgo” · View on HN
Except imagine you're embedded on the string itself and cannot actually sense the string "moving through space". The way you have to measure it is by sensing tiny changes in distance between the left and right side of the string as it wiggles around. The actual detail of the experiment and the precision they reach is quite fascinating. Veratisium has a pretty good video explaining it in more laymen terms [0] [0] ▶ this video
in “LIGO Detects Gravitational Waves for Third Time” · View on HN
Here is a great video with explanations: ▶ this video Short answer - they use lots of techniques - its super hard.
in “LIGO Detects Gravitational Waves for Third Time” · View on HN
You don't have to watch his channel for very long to learn that he often does (see his video about the recent gravitational wave detection [1], plus a bunch more). [1] ▶ this video
in “Unveiling the first-ever image of a black hole [video]” · View on HN
I figured that one tube is stretched by the gravitational waves and the perpendicular tube is unaffected, so you're measuring the difference between the two tubes. Simple and easy to understand. However, the video mentioned that both light and the detection apparatus are stretched by the same degree and the physicist says "the light does get stretched and that part doesn't do the measurement for us"[1] -- which makes me think that the simple and easy explanation is not quite right. There's some subtlety that I think I'm missing. [1] ▶ this video (6min 16sec into the video)
in “The Absurdity of Detecting Gravitational Waves (2017) [video]” · View on HN
From my understanding as a layperson, using other LIGO style detectors to substitute the z-axis won’t work. You need to shoot laser pulses continuously and in sync into two axes from the same detector to be able to detect ripples in spacetime. The sensitivity of two non-connected detectors working together is not high enough. See [1] for how the detection works. [1] ▶ this video
in “Signatures of extra dimensions in gravitational waves” · View on HN