Disentangling forms of Lorentz violation with complementary clock comparison experiments

Altschul, Brett

doi:10.1103/physrevd.79.061702

Cited by 22 publications

(9 citation statements)

References 46 publications

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“…The possibility that physics beyond the standard model might violate Lorentz invariance [1][2][3] has motivated experimental tests with high precision and broad scope. In particular, experiments have placed stringent limits on anisotropies in the laws of motion of the photon, electron, proton and neutron based on, e.g., electromagnetic cavities [4][5][6][7], clock comparisons [8][9][10][11][12][13], magnetometry [14][15][16][17][18], ultracold neutrons [19] and ion traps [20]. Some anisotropic inertial masses of particles are known to be below 10 −28 GeV [18], but others are more weakly constrained.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Tests of Lorentz Symmetry Using Quartz Oscillators

Haslinger

Mizrachi

et al. 2016

Phys. Rev. X

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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 in the matter and photon sector of the standard model extension generate anisotropies in particles' inertial masses and the elastic constants of solids, giving rise to measurable anisotropies in the resonance frequencies of acoustic modes in solids. A first realization of such a "phonon-sector" test of Lorentz symmetry using room-temperature stresscompensated-cut crystals yields 120 h of data at a frequency resolution of 2.4 × 10 −15 and a limit of c n Q ¼ ð−1.8 AE 2.2Þ × 10 −14 GeV on the most weakly constrained neutron-sector c coefficient of the standard model extension. Future experiments with cryogenic oscillators promise significant improvements in accuracy, opening up the potential for improved limits on Lorentz violation in the neutron, proton, electron, and photon sector.

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Section: Introductionmentioning

confidence: 99%

Acoustic Tests of Lorentz Symmetry Using Quartz Oscillators

Haslinger

Mizrachi

et al. 2016

Phys. Rev. X

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“…The d coefficients are particularly interesting because unlike most of the other terms they are CPT even; they break Lorentz symmetry without violating CPT. Recently, efforts have been made to disentangle various LLI violating terms of the SME by comparing clock experiments performed on heavy and light nuclei [13]. As Hg and Cs both have heavy nuclei, the present results may also prove useful in these efforts.…”

Section: Introductionmentioning

confidence: 82%

Limits on local Lorentz invariance in mercury and cesium

et al. 2012

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We report bounds on local Lorentz invariance (LLI) violation in Cs and Hg. The limits are obtained through the observation of the spin-precession frequencies of 199 Hg and 133 Cs atoms in their ground states as a function of the orientation of an applied magnetic field with respect to the fixed stars. We measure the amplitudes of the dipole couplings to a preferred direction in the equatorial plane to be 19(11) nHz for Hg and 9(5) μHz for Cs. The upper bounds established here improve upon previous bounds by about a factor of 4. The improvement is primarily due to mounting the apparatus on a rotating table. Bounds are established on several terms in the standard model extension including the first bounds on the spin couplings of the neutron and proton to the z direction:b n z < 7 × 10 −30 GeV andb p z < 7 × 10 −29 GeV.

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“…Other past work has explored the influence of nucleons' motions inside large nuclei and how that motion affects precisely which LV coefficients are measurable in atomic clock experiments [30]. To the extent that the short-distance nucleon-nucleon potential responsible for nuclear binding is mediated by the exchange of multiple pions, the LV interaction Lagrangians described in this work may be used to understand how Lorentz violation would modify the shapes of the nucleon-nucleon potentials.…”

Section: Discussionmentioning

confidence: 99%

Hadronic Lorentz violation in chiral perturbation theory including the coupling to external fields

2018

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If any violation of Lorentz symmetry exists in the hadron sector, its ultimate origins must lie at the quark level. We continue the analysis of how the theories at these two levels are connected, using chiral perturbation theory. Considering a 2-flavor quark theory, with dimension-4 operators that break Lorentz symmetry, we derive a low-energy theory of pions and nucleons that is invariant under local chiral transformations and includes the coupling to external fields. The pure meson and baryon sectors, as well as the couplings between them and the couplings to external electromagnetic and weak gauge fields, contain forms of Lorentz violation which depend on linear combinations of quark-level coefficients. In particular, at leading order the electromagnetic couplings depend on the very same combinations as appear in the free particle propagators. This means that observations of electromagnetic processes involving hadrons-such as vacuum Cerenkov radiation, which may be allowed in Lorentz-violating theories-can only reliably constrain certain particular combinations of quark coefficients.

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Disentangling forms of Lorentz violation with complementary clock comparison experiments

Cited by 22 publications

References 46 publications

Acoustic Tests of Lorentz Symmetry Using Quartz Oscillators

Acoustic Tests of Lorentz Symmetry Using Quartz Oscillators

Limits on local Lorentz invariance in mercury and cesium

Hadronic Lorentz violation in chiral perturbation theory including the coupling to external fields

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