Atom interferometry determination of G at 10 ppm
In plain words
Atoms in free fall make test masses that cannot twist, stretch or be magnetized like a pendulum fiber, so they could give G free of the usual suspects. Their best result so far is about ten times less precise than needed.
Precise statement
Atom-interferometric gravity gradiometry with well-characterized source masses gave G with about 150 ppm uncertainty (Rosi et al 2014). Determine G with uncertainty below $10^{-5}$ relative by a cold-atom method, sufficient to discriminate among the discrepant macroscopic results.
What would settle it
A cold-atom G measurement with total uncertainty below 10 ppm and a published complete error budget.
Parent problems
- Special case of Why laboratory values of G scatter beyond their stated uncertainties · open · from revision 1 The parent was revised since revision 1: it now states another question.
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