Rana Adhikari, Caltech physics professor and LIGO researcher, discusses the maximum observational range achievable by current-generation ground-based gravitational wave detectors.
“With the current systems, you know, as big as they are, if we put in like our best technical hacks into them that we can imagine, we could maybe get to the place where the universe was about a one fifth or one sixth of its current age. So we could look back something like ten billion years into the past, which is pretty great.”
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More from Rana Adhikari
Opinion
Adhikari: LIGO could probably double its detected signals from existing data
“I think in our data there must be, probably we could double the number of signals we have right now if we were to, I mean, that's my guess. It could be much more.”
Rana AdhikariSep 15, 2017▶ 30:27The Technical Challenges of Measuring Gravitational Waves - Rana Adhikari of LIGO · Y Combinator
AssertionNot checkable as stated
Adhikari: 40-kilometer interferometers could detect collapsing first stars
“We would be able to find signals from Basically, the, all the way back. I mean, it would have. We would find the first stars in the universe, and they were collapsing, if they exist, which I think they do.”
Rana AdhikariSep 15, 2017▶ 51:05The Technical Challenges of Measuring Gravitational Waves - Rana Adhikari of LIGO · Y Combinator
What-if
Adhikari: Decades of required effort would have deterred early gravitational wave researchers
“If they, I think if they had known how tough it would be, or that it was going to take fifties, five years to have success, probably no one would have started.”
Rana AdhikariSep 15, 2017▶ 2:58The Technical Challenges of Measuring Gravitational Waves - Rana Adhikari of LIGO · Y Combinator
AssertionSupported
Adhikari: LIGO stabilizes lasers ten million times beyond commercial models
“So we take the best laser in the world that we can find, and then we stabilize it and make it about ten million times more stable than what you can buy, and then it's kind of just barely good enough, and we're gonna have to do better if we want to do better.”
Rana AdhikariSep 15, 2017▶ 18:55The Technical Challenges of Measuring Gravitational Waves - Rana Adhikari of LIGO · Y Combinator
“There's so much laser power that when you, it's weird to think about, but there's so much laser power when we hit the mirror, it moves the mirror. And the mirror, if you, to imagine it, is about this big. And it is 40 kilograms”
Rana AdhikariSep 15, 2017▶ 21:53The Technical Challenges of Measuring Gravitational Waves - Rana Adhikari of LIGO · Y Combinator
Insight
Adhikari: LIGO noise reduction has reached linear limits, needs nonlinear regression
“Now we've reached the limit of what you can do with linear noise subtraction, and we need some better ideas on how to do the next thing. And the next thing involves nonlinear regression.”
Rana AdhikariSep 15, 2017▶ 27:59The Technical Challenges of Measuring Gravitational Waves - Rana Adhikari of LIGO · Y Combinator
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