4 ms·
thanks @privong, this is a first rate explanation of LIGO/BICEP2 and CMB and a major reason I hang out on HN.
by bootload 11y ago
thanks @privong, this is a first rate explanation of LIGO/BICEP2 and CMB and a major reason I hang out on HN.
- privong 11y agoSure thing, @bootload. By the way, I should have mentioned that we already have indirect evidence for gravitational waves, from the orbital decay of binary pulsars such as PSR B1913+16 [0]. The observed orbital decay has an excellent match with the orbital decay predicted using general relativity and gravitational waves. [1] shows the agreement, with the line being a theoretical prediction and not a fit. [0] https://en.wikipedia.org/wiki/PSR_B1913%2B16 https://en.wikipedia.org/wiki/PSR_B1913%2B16 [1] https://en.wikipedia.org/wiki/PSR_B1913%2B16#/media/File:PSR_B1913%2B16_period_shift_graph.svg https://en.wikipedia.org/wiki/PSR_B1913%2B16#/media/File:PSR...