Enhanced violation of the Lorentz invariance and Einstein's equivalence principle in nuclei and atoms

TL;DR

This paper investigates violations of Lorentz invariance and Einstein's equivalence principle in nuclei and atoms, highlighting significant enhancements in certain nuclear transitions and providing improved limits on fundamental constants through experimental data analysis.

Contribution

It presents a novel analysis of LLIV and EEPV effects in specific nuclei, linking nuclear quadrupole moments to anisotropy measurements and significantly tightening constraints on proton LLIV constants.

Findings

Enhanced EEPV effects in 229Th nucleus transition

Expressed nuclear LLIV tensors via nuclear quadrupole moments

Improved limits on proton LLIV constants by four orders of magnitude

Abstract

Local Lorentz Invariance violating (LLIV) and Einstein equivalence principle violating (EEPV) effects in atomic experiments are discussed. The EEPV effects are strongly enhanced in the narrow 7.8 eV transition in 229Th nucleus. Nuclear LLIV momentum tensors describing anisotropy in the maximal attainable speed for massive particles (analog of Michelson-Morley experiment for light) are expressed in terms of the experimental values of nuclear quadrupole moments. Calculations for nuclei of experimental interest 133Cs, 85Rb, 87Rb, 201Hg, 131Xe and 21Ne have been performed. The results for 21Ne are used to improve the limits on the proton LLIV constants by 4 orders of magnitude.