We searched for violations of the weak equivalence principle using a cryogenic torsion balance with a pendulum comprised of superconducting niobium and copper. We constrain the Eötvös parameter with 95% confidence to ${\eta }_{{\mathrm{Nb}}^{*}\text{−}\mathrm{Cu}}\le 2.0\times {10}^{-9}$ and ${\eta }_{\mathrm{CP}\text{−}\mathrm{ee}}\le 9.2\times {10}^{-4}$ for superconducting niobium and Cooper pairs, respectively.

Close

PrevNext

View figure in article

• Experimental studies of gravity
• Laboratory studies of gravity