PDA

View Full Version : is 'frame dragging' at all related to, or simlilar to tidal effects?



WaxRubiks
2019-Mar-22, 07:40 AM
Are these two effects similar in magnitude and other things....like the tidal effect of Earth on the Moon; is that similar in the effect on something in orbit around a black holes?

Grey
2019-Mar-22, 01:52 PM
Are these two effects similar in magnitude and other things....like the tidal effect of Earth on the Moon; is that similar in the effect on something in orbit around a black holes?They're certainly not even vaguely similar in magnitude. Tidal effects are sufficiently obvious in the Earth-Moon system that we knew about them long before we understood the causes at all. Frame dragging, on the other hand, is a sufficiently small effect that even careful experiments designed specifically to measure it (https://en.wikipedia.org/wiki/Frame-dragging#Experimental_tests) have a pretty high uncertainty even today.