Phys. Rev. Lett. 100, 031101 (2008) [4 pages]Atom-Interferometry Tests of the Isotropy of Post-Newtonian GravityReceived 19 October 2007; published 22 January 2008 We present a test of the local Lorentz invariance of post-Newtonian gravity by monitoring Earth’s gravity with a Mach-Zehnder atom interferometer that features a resolution of up to 8×10-9g/√Hz, the highest reported thus far. Expressed within the standard model extension (SME) or Nordtvedt’s anisotropic universe model, the analysis limits four coefficients describing anisotropic gravity at the ppb level and three others, for the first time, at the 10 ppm level. Using the SME we explicitly demonstrate how the experiment actually compares the isotropy of gravity and electromagnetism. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.031101
DOI:
10.1103/PhysRevLett.100.031101
PACS:
04.80.Cc, 03.75.Dg, 04.25.Nx, 11.30.Cp
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