Effective QFT and what it tells us about dynamical torsion

TL;DR

This paper reviews how effective quantum field theory constrains the existence and properties of dynamical spacetime torsion, suggesting it must be very massive and possibly observable only through symmetry-breaking effects.

Contribution

It provides a comprehensive analysis of dynamical torsion within effective QFT, highlighting restrictions on its mass and potential observational signatures.

Findings

Propagating torsion must be very massive

Torsion mass exceeds fermion masses

Observable effects may arise from symmetry breaking

Abstract

The covariantly constant spacetime torsion is one of the fields which may break Lorentz and CPT symmetry. We review the previous works on the dynamical torsion in the framework of effective quantum field theory (QFT). It turns out that the existence of propagating torsion is strongly restricted by the QFT principles. In particular, the torsion mass must be much greater than the masses of all fermionic particles. In this situation, the main chance to observe torsion is due to some symmetry breaking which may, in principle, produce almost constant background torsion field.