The Lorentz Group, Noncommutative Space-Time, and Nonlinear Electrodynamics in Majorana-Oppenheimer Formalism

TL;DR

This paper investigates non-linear electrodynamics in non-commutative space-time using the Majorana-Oppenheimer formalism, analyzing symmetry properties and invariance under dual transformations with implications for field theory.

Contribution

It introduces a detailed analysis of the form-invariance of non-linear constitutive relations in non-commutative electrodynamics using complex orthogonal group theory and identifies specific symmetry groups.

Findings

Identified Abelian 2-parametric small groups preserving constitutive relations.

Found a special reference frame with SO(2) mp; SO(1,1) structure for non-zero length K.

Demonstrated invariance of non-linear equations only under discrete dual transformations.

Abstract

Non-linear electrodynamics arising in the frames of field theories in non-commutative space-time is examined on the base of the Riemann-Silberstein-Majorana-Oppenheimer formalism. The problem of form-invariance of the non-linear constitutive relations governed by six non-commutative parameters \theta_{kl} \sim {\bf K} = {\bf n} + i {\bf m} is explored in detail on the base of the complex orthogonal group theory SO(3.C). Two Abelian 2-parametric small groups, isomorphic to each other in abstract sense, and leaving unchangeable the extended constitutive relations at arbitrary six parameters \theta_{kl} of effective media have been found, their realization depends explicitly on invariant length {\bf K}^{2}. In the case of non-vanishing length a special reference frame in which the small group has the structure SO(2) \otimes SO(1,1) has been found. In isotropic case no such reference frame exists. The way to interpret both Abelian small groups in physical terms consists in factorizing corresponding Lorentz transformations into Euclidean rotations and boosts. In the context of general study of various dual symmetries in non-commutative field theory, it is demonstrated explicitly that the non-linear constitutive equations in non-commutative electrodynamics are not invariant under continuous dual rotations, instead only invariance under discrete dual transformation exists.