Covariant Quantum Fields via Lorentz Group Representation of Weyl Operators

TL;DR

This paper develops a relativistically covariant quantum stochastic calculus by constructing Poincare group representations using Weyl operators on Fock spaces tailored to particle properties, enabling a covariant quantum field framework.

Contribution

It introduces a novel construction of covariant quantum fields via Lorentz group representations of Weyl operators on Fock spaces, extending quantum stochastic calculus to relativistic settings.

Findings

Constructed Poincare group representations using Weyl operators.

Built fiber bundle representations induced from little groups.

Outlined methods for covariant quantum stochastic calculus.

Abstract

The building blocks of Hudson-Parthasarathy quantum stochastic calculus start with Weyl operators on a symmetric Fock space. To realize a relativistically covariant version of the calculus we construct representations of Poincare group in terms of Weyl operators on suitably constructed, Bosonic or Fermionic based on the mass and spin of the fundamental particle, Fock spaces. We proceed by describing the orbits of homogeneous Lorentz group on R4 and build fiber bundle representations of Poincar\'e group induced from the stabilizer subgroups (little groups) and build the Boson Fock space of the Hilbert space formed from the sections of the bundle. Our Weyl operators are constructed on symmetric Fock space of this space and the corresponding annihilation, creation, and conservation operators are synthesized in the usual fashion in relativistic theories for space-like, time-like, and light-like fields. We achieve this by constructing transitive systems of imprimitivity (second-quantized SI), which are dynamical systems with trajectories dense in the configuration space, by induced representations. We provide the details of the field operators for the case of massive Bosons as the rest are similar in construction and indicate the ways to construct adapted processes paving way for building covariant quantum stochastic calculus.