Re: how do you measure a change of 1/10,000 of a proton diameter with a laser?
The paper itself is an easy read. Anyone with even a passing interest should review it.
The 'strain' (warp) is 10^-21. The signal is certainly in the noise. The paper explains how they did it.
I thought that the signal was on the order of the diameter of a proton (10^-18), not "1/10,000" that.
km-scale (10^3 m). 10^-21 strain (warp ratio). Proton (10^-18).
+3 scale, subtract 21 orders of magnitude = -18 scale
Did I miss a memo?