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Area of Science:

  • Fundamental Physics
  • Electrodynamics
  • Quantum Optics

Background:

  • Lorentz invariance is a cornerstone of modern physics.
  • Testing Lorentz violation probes potential new physics beyond the Standard Model.
  • Optical cavities offer high sensitivity for precision measurements.

Purpose of the Study:

  • To search for evidence of Lorentz violation in electrodynamics.
  • To constrain parameters within the Standard Model Extension (SME).
  • To improve existing experimental limits on specific SME parameters.

Main Methods:

  • Utilized a resonant optical ring cavity with a dielectric element.
  • Employed a double-pass configuration for null measurement and common-mode rejection.
  • Measured the resonant frequency difference between counterpropagating light beams.

Main Results:

  • No evidence for odd-parity anisotropy was detected at the level of δc/c ≲ 10⁻¹⁴.
  • Established new, stringent limits on three odd-parity SME parameters (κ(o+)(JK)).
  • Achieved a significantly improved limit on the scalar SME parameter (κ(tr)).

Conclusions:

  • The experiment places strong constraints on potential Lorentz-violating effects in electrodynamics.
  • The results contribute to testing the fundamental symmetries of spacetime.
  • This work advances precision measurements in the search for new physics.