New Limits on Coupling of Fundamental Constants to Gravity Using ${}^{87}$Sr Optical Lattice Clocks

S. Blatt, A. D. Ludlow, G. K. Campbell +13

The ${}^1{\mathrm{S}}_0$-${}^3{\mathrm{P}}_0$ clock transition frequency ${\nu }_{\text{Sr}}$ in neutral ${}^{87}$Sr has been measured relative to the Cs standard by three independent laboratories…