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+--- Thread: To Hunt Gravitational Waves (/thread-4770.html)
To Hunt Gravitational Waves - Just Looking - 08-29-2019
Scientists Had to Create the Quietest Spot on Earth.
About a mile and a half from a building so big you can see it from space, every car on the road slows to a crawl. Drivers know to take the
10 mph (16 km/h) speed limit very seriously: That's because the building houses a massive detector that's hunting for celestial vibrations
at the smallest scale ever attempted. Not surprisingly, it's sensitive to all earthly vibrations around it, from the rumblings of a passing car to
natural disasters on the other side of the globe.
As a result, scientists who work at one of the LIGO (Laser Interferometer Gravitational-Wave Observatory) detectors must go to extraordinary
lengths to hunt down and remove all potential sources of noise — slowing down traffic around the detector, monitoring every tiny tremor in
the ground, even suspending the equipment from a quadruple pendulum system that minimizes vibrations — all in the effort to create the
most "silent" vibrational spot on Earth."Everything is about noise hunting," said Janeen Romie, detector-engineering group lead at the LIGO
detector in Louisiana.
Why are LIGO physicists so obsessed with eliminating noise and creating the most vibration-free place on the planet? To understand that,
you need to know what gravitational waves are and how LIGO detects them in the first place. According to general relativity, space and
time are part of the same continuum, which Einstein called space-time. And in space-time, rapidly accelerating massive objects can produce
gravitational waves, which look like the ripples that radiate outward when a pebble is dropped onto the surface of a pond.These waves reveal
the stretching and contraction of the fabric of the cosmos itself.
https://www.livescience.com/ligo-detector-really-hates-noise.html
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RE: To Hunt Gravitational Waves - Wallfire - 08-29-2019
Thanks for the very interesting post
RE: To Hunt Gravitational Waves - guohua - 08-29-2019
@"Just Looking"
That is interesting just like @"Wallfire" said above.
RE: To Hunt Gravitational Waves - Mystic Wanderer - 08-29-2019
That's a topic I will have to take some time to look in to, but it sounds very interesting.
Thanks!
