$\kappa$-Minkowski Spacetimes and DSR Algebras: Fresh Look and Old Problems

TL;DR

This paper revisits Deformed Special Relativity (DSR) within a Hopf algebra framework, exploring algebraic structures, realizations, and potential quantum mechanical interpretations, while discussing conceptual issues and physical applications at the Planck scale.

Contribution

It introduces a minimal deformed Weyl-Heisenberg algebra framework for DSR, unifying $ppa$-Minkowski spacetime with Poincare9 generators via nonlinear transformations, and discusses twist realizations and quantum covariant structures.

Findings

Unified $ppa$-Minkowski and Poincare9 algebra through nonlinear transformations.

Realizations of DSR algebra in standard Weyl-Heisenberg algebra enable quantum mechanical interpretation.

Discussion of twist realizations and deformation quantization of $ppa$-Minkowski spacetime.

Abstract

Some classes of Deformed Special Relativity (DSR) theories are reconsidered within the Hopf algebraic formulation. For this purpose we shall explore a minimal framework of deformed Weyl-Heisenberg algebras provided by a smash product construction of DSR algebra. It is proved that this DSR algebra, which uniquely unifies $\kappa$-Minkowski spacetime coordinates with Poincar\'e generators, can be obtained by nonlinear change of generators from undeformed one. Its various realizations in terms of the standard (undeformed) Weyl-Heisenberg algebra opens the way for quantum mechanical interpretation of DSR theories in terms of relativistic (St\"uckelberg version) Quantum Mechanics. On this basis we review some recent results concerning twist realization of $\kappa$-Minkowski spacetime described as a quantum covariant algebra determining a deformation quantization of the corresponding linear Poisson structure. Formal and conceptual issues concerning quantum $\kappa$-Poincar\'e and $\kappa$-Minkowski algebras as well as DSR theories are discussed. Particularly, the so-called "$q$-analog" version of DSR algebra is introduced. Is deformed special relativity quantization of doubly special relativity remains an open question. Finally, possible physical applications of DSR algebra to description of some aspects of Planck scale physics are shortly recalled.