Limits on New Lorentz-violating Bosons

TL;DR

This paper establishes new constraints on Lorentz-violating scalar fields interacting with Standard Model fermions, using laboratory experiments and astrophysical observations to explore physics beyond the Standard Model.

Contribution

It introduces novel bounds on Lorentz-violating scalar interactions by combining torsion-balance, magnetometer, and stellar energy loss data.

Findings

Torsion-balance experiments provide stringent local constraints.

Magnetometer searches extend limits to low-mass scalar fields.

Red Giant star observations set strong astrophysical bounds.

Abstract

We obtain novel constraints on new scalar fields interacting with Standard Model fermions through Lorentz-violating couplings, bridging searches for scalar particles and Lorentz-symmetry tests. These constraints arise from torsion-balance experiments, magnetometer searches, and an excessive energy loss in Red Giant stars. Torsion-balance experiments impose stringent constraints, benefitting from large macroscopic sources including the Sun and Earth. Magnetometer-based searches, which detect pseudo-magnetic fields through spin precession, offer additional limiting power to low-mass scalar fields. Meanwhile, observations of Red Giant stars place strong limits on additional energy loss mechanisms, extending these constraints to higher scalar mass ranges and a wider range of Lorentz-violating couplings. Combining data from laboratory experiments and astrophysical observations, this approach strengthens constraints on Lorentz-violating interactions and paves the way for future investigations into physics beyond the Standard Model.