Enhanced effects of the Lorentz invariance and Einstein equivalence principle violation in 229Th nuclear transition

TL;DR

This paper discusses how certain nuclear transitions in 229Th and 235U could significantly enhance the detection of violations of Lorentz invariance and Einstein equivalence principle, using high-precision laser spectroscopy.

Contribution

It introduces the potential for nuclear transitions to amplify effects of fundamental symmetry violations, enabling more sensitive experimental tests.

Findings

229Th transition effects could be 100,000 times larger than in atoms

High-precision spectroscopy can investigate these effects effectively

Similar effects are expected in 235U and Mossbauer transitions

Abstract

The Lorentz invariance and Einstein equivalence principle violating effects in the narrow 7.8 eV transition in 229Th nucleus may be 100 000 times larger than in atoms. This transition may be investigated using high precision laser spectroscopy methods, has a very small width, and suppressed systematic effects. Similar values of the effects are expected in 73 eV 235U nuclear transition which is coming within the reach of the laser spectroscopy. Mossbauer transitions give another possibility.