How LIGO Detects Gravitational Waves | Incredible Interferometer At Home

[@user-nh3nm5re1d]

Is that magnifying galss between beam and spliter ??

[@jodidiehl487]

I thought I understood LIGO (I did at the basic level) but the way you described it was perfect and helped me understand it even more!

[@ChrisPattisonCosmo]

Awesome, I'm glad it helped!

[@radheya]

amazingly demonstrated and explained!! Thank you!!

[@BagyaLakshmiK-xr4lp]

What is the angle you placed the mirrors and laser sir

[@RandyJames22]

Thank you for the demo -- it's quite intuitive, Chris! So, LISA will be orbiting around L5? How stable will they be? What propulsion may be necessary?

[@ChrisPattisonCosmo]

Yea, LISA will be at L5, which is obe of the stable lagrange points. Each of the three spacecraft will have 2 test masses in it that define the ends of the arms, and these test masses will be in free fall. The spacecreft then just have some small (but very precise) thrusters on board to keep the test masses as their centre of mass. They will be very stable once they're in position, a mission a few years ago called "LISA Pathfinder" tested the tech (although it was just one spacecraft rather than three) and performed even better than expected!

[@RandyJames22]

@@ChrisPattisonCosmo Thank you for the tech info -- it will be an amazing feat!

[@michaelcottam164]

This is super interesting!

[@ChrisPattisonCosmo]

Thanks Mike! :)

[@StaticBlaster]

I'm actually reading one of Janna Levin's books called Black Hole Blues. She explains the history of LIGO and the years that went into the concept and its construction. This is a remarkable invention and feat they pulled off.

[@ChrisPattisonCosmo]

It blows my mind every time I think about how precise these machines are!

[@StaticBlaster]

@@ChrisPattisonCosmo Same. It's just insane how they can calculate the size of the interferometer in order to measure something that's a billionth the width of a human hair.

[@rajeshpadhi2075]

If both the space and light are stretched and contracted by GW, the how to measure the difference?

[@marcodev3375]

If the changes is smaller than protons, so the wavelength is too long, even if using gamma ray. How it's possible to detect by phase shift of long wavelength?

[@blessilkunju]

You haven't explained how GW and laser make interactions

[@melvinbartoo6782]

They recorded the sound that day . If we make a recording of it over and over and play it can we make a hellium balloon move up and down by turnning a speaker up and down ????

[@spal3907]

very good explanation

[@garymartin9777]

now that the existence of GW is shown, what's the purpose of looking for more? a detection doesn't help us find exactly which mass caused it. so what's the point?

[@tutorJ485]

What if there is an earthquake?

[@melvinbartoo6782]

Ilike Youre Little example

[@ChrisPattisonCosmo]

Thanks! :)

[@ohmultiverse]

Unfortnately you failed to mention a critical piece of LIGO, without which it simply could not reliably detect gravwaves: there are two complete LIGOs, separated by thousands of miles! It is only if BOTH detect gravwaves essentially simultaneously that we can say with virtual certainty that we have detected gravwaves.

[@anticat900]

The thing is a fraud, run, tested and vitrified by the very same people that have an interest in it being funded. At best, at best, it can retrospectively look at its data after other detectors (visual or radio) note a large gravitational event has occurred. As noted in your video, the nigh on impossible task of detection is indeed impossible with a device so small for tasks involved.

[@SciD1]

Definitely a fraud. Unfortunately, only the leading physicists appear to know about it. The others are simply parroting because they're just too stupid and gullible, like this guy here, the general public, and the investors... They don't even know what causes gravity, but they are detecting waves of space-time, which is nothing more than a mathemagical abstraction. Waves of imaginary space-time, coming from highly hypothetical objects, at very hypothetical distances. Waves a fraction of the size of a proton... 😂 Even the so-called detection can come from just about anything possible. Totally ridiculous! Even the inventor himself, Einstein, did not believe in their existence! But we are paying for it. 🙄

[@zhavlan1258]

Hello from Kazakhstan. The Dark Universe requires a lot of money from the budget: an experiment that sheds new light on the Universe will help save costs. We can create an educational and practical device and practically master Einstein’s theories of relativity or obtain, for example, new physics: Postulate 1. Light is an ordered vibration of gravitational quanta. Postulate 2. The gravitational field controls the frequency and speed of light in a vacuum. This is determined experimentally using a hybrid fiber optic gyroscope (based on Michelson's experiment 1881-2024). Using a hybrid fiber optic gyroscope, the straight-line speed of vehicles can be measured. There is a company in China that makes (fiber optic angular velocity meter) they will be able to create a hybrid device. Please, can you come to an agreement with them? I guarantee payment at cost on my part.

[@richwhitelivesmatterforsureduh]

I still dont understand it. :( I am so dumb :(