Constraints on background torsion field from K-physics

Abstract

We point out that a background torsion field will produce an effective potential to the K and K̅ with opposite signs. This allows us to constrain the background torsion field from the K_L and K_S mass difference, CPT violating K⁰ and K̅⁰ mass difference and the CP violating quantities ε and η₊₋. The most stringent bound on the cosmological background torsion <T⁰><10⁻²⁵ GeV comes from the direct measurement of the CPT violation.