Researchers propose using cooled radioactive molecules containing radium nuclei to detect nuclear symmetry violations. This tabletop approach could open a new avenue for exploring physics beyond the Standard Model, particularly in the search for nuclear electric dipole moments (EDMs). The presence of a nuclear EDM would violate parity (P) and time-reversal (T) symmetries, which in turn would imply new physics, as the Standard Model predicts extremely small, almost undetectable nuclear EDMs.

Interest in radium (Ra) stems from the intrinsically "pear-shaped" form of its nuclei, such as Ra-225. This particular nuclear deformation amplifies sensitivity to P and T symmetry violations. By incorporating these nuclei into molecules, such as radium fluoride (RaF), the internal electric fields of the molecule are expected to interact strongly with any nuclear EDM, producing a measurable effect. The technique of cooling these molecules to ultracold temperatures is crucial, as it reduces thermal noise and allows for prolonged precision measurements, increasing experimental sensitivity.

This method represents a complementary alternative to high-energy experiments, such as those performed at the LHC, for the search for new physics. The ability to conduct these measurements in a controlled laboratory environment, using precision atomic and molecular physics techniques, offers a low-cost and high-sensitivity route to probe fundamental interactions. The success of this proposal could provide significant constraints on theories of physics beyond the Standard Model, including supersymmetry models and other extensions that predict detectable nuclear EDMs.