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We propose and demonstrate a test of Lorentz symmetry based on new, compact,and reliable quartz oscillator technology. Violations of Lorentz invariance inthe matter and photon-sector of the standard model extension (SME) generateanisotropies in particles' inertial masses and the elastic constants, givingrise to measurable anisotopies in the resonance frequencies of acoustic modesin solids. A first realization of such a "phonon-sector" test of Lorentzsymmetry using room-temperature SC-cut crystals provides a limit of $\tildec_Q^{\rm n}=(-1.8 \pm 2.2)\times 10^{-14}$\,GeV on the most weakly constrainedneutron-sector $c-$coefficient of the SME. Future experiments with cryogenicoscillators promise significant improvements in accuracy, opening up thepotential for improved limits on Lorentz violation in the neutron, proton,electron and photon sector.

Acoustic tests of Lorentz symmetry using quartz oscillators