A Representation of Quantum Measurement in Nonassociative Algebras

Susumu Ôkubo

Gerd Niestegge

Peter Schupp, Richard J. Szabo

Abstract We develop a version of quantum mechanics that can handle nonassociative algebras of observables and which reduces to standard quantum theory in the traditional associative setting. Our algebraic approach is naturally probabilistic and is based on using the universal enveloping algebra of a general nonassociative algebra to introduce a generalized notion of associative composition product. We formulate properties of states together with notions of trace, and use them to develop Gel’fand–Naimark–Segal constructions. We describe Heisenberg and Schrödinger pictures of completely positive dynamics, and we illustrate our formalism on the explicit examples of finite-dimensional matrix Jordan algebras as well as the octonion algebra.

Jens Köplinger, Джунушалиев Владимир Джумакадырович

This paper follows recent steps towards a nonassociative quantum theory and points out the mathematical structure behind the proposed modifications to conventional quantum theory. An N=1 supersymmetry model and a strong force glueball ansatz is highlighted. Using nonassociative complex octonion algebra, it is shown how the Lorentz Lie algebra can be understood as a four dimensional generalization of the algebra of spin-1/2 operators in physics. Probability is speculated to become an emergent phenomenon from some nonassociative geometry in which to better understand the fluxes involved. A prototype nonassociative quantum theory in one dimension is brought forward to illustrate how normed division algebras may aid in modeling isospin properties that are similar to observed field and particle symmetries in nature. This prototype is built from a principle of self-duality between types of active and passive transformations and supplied with a modified Born rule that models observation, similar to conventional quantum mechanics. Solutions on the complex numbers, quaternions and octonions are discussed. The Hopf coquasigroup structure of the octonionic eigenvalue relation is shown and advertised as a tool for future investigation into the complete solution set of the model.

Daniel J. Lehmann, Kurt Engesser, Dov M. Gabbay

Susumu Ôkubo

Within an algebraic framework of non-associative quantum mechanics, a Hilbert space and the corresponding Schroedinger equation have been introduced into the theory as follows. The underlying non-associative operator algebra A is assumed to be flexible and Lie-admissible so that it is compatible with the Heisenberg equation of motion and quantization. A Hilbert space can be introduced into the theory as a faithful representation of the associated Lie algebra A/sup -/ of the Lie-admissible algebra A. However, if A/sup -/ is the standard Heisenberg algebra, and if the representation is irreducible, then it is shown that A must be associative, reproducing the standard associative quantum mechanics. Some discussions to circumvent this No-Go theorem are discussed. Especiallyyu if we are interested in the formulation of infinite component wave equations, then this difficulty can be avoided.