General Relativity, Still Making Waves

In a validation of Albert Einstein's genius, the power of new technology, and the relevance of the scientific method (even if it takes a century), scientists working on a project called LIGO have witnessed ripples in the fabric of spacetime caused by gravitational waves. First predicted by Einstein in 1916 on the basis of general relativity, gravitational waves are cosmic shock waves that can result from the interactions of massive objects like black holes and neutron stars. Unlike electromagnetic waves, which pass through space, gravitational waves change the shape of space itself. Extremely perceptive observers would find themselves in a funhouse as gravitational waves passed through, watching objects and distances get bigger and smaller without actually moving a micron: seeing solid matter jiggle like jello.

LIGO's results are the most sensational in physics since the observation of the Higgs boson in 2013. Ethan Siegel puts the discovery into perspective on Forbes, writing "we’ve just detected two merging black holes for the first time, tested their physics, found a tremendous agreement with Einstein, and seen evidence that this happens over a billion light years away across the Universe." Meanwhile Greg Laden says "the gravity of this situation" deserves a newton of skepticism until scientists can repeat their result. And on Dynamics of Cats, Steinn Sigurðsson shares videos from the LIGO team to help everyone understand the project.

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"There is a single light of science, and to brighten it anywhere is to brighten it everywhere." -Isaac Asimov One of the most spectacular and successful ideas of the 20th Century was Einstein's General Relativity, or the idea that matter and energy determines the curvature of spacetime, and the…
First, what is a gravitational wave? I find it interesting that some people are expressing difficulty in understanding what a gravitational wave is, as though everybody (who is not a physicist) has a perfectly good understanding of what any kind of wave is. We don't need to go too deeply beneath…
LIGO and allies have also provided a bunch of fun useful stuff: Have We Detected Gravitational Waves Yet? Stretch and Squash Black Hole Hunter Einstein@Home Gravitational Waves 101 - Markus Pössel's excellent visualizations. The Data The Papers SXS - Simulating eXtreme Spacetimes visualizations…
"Ladies and gentlemen, we have detected gravitational waves." -David Reitze More than 100 years after Einstein's relativity came out, one of its last great predictions -- the existence of gravitational radiation -- has been directly experimentally confirmed! The LIGO collaboration has observed two…

W against T, reference required. #conspiracyofscience

By Yaniv Stern (not verified) on 31 May 2016 #permalink