Kappa Snyder deformations of Minkowski spacetime, realizations and Hopf algebra

Abstract

We present Lie-algebraic deformations of Minkowski space with undeformed Poincaré algebra. These deformations interpolate between Snyder and $\kappa$-Minkowski space. We find realizations of noncommutative coordinates in terms of commutative coordinates and derivatives. By introducing modules, it is shown that although deformed and undeformed structures are not isomorphic at the level of vector spaces, they are however isomorphic at the level of Hopf algebraic action on corresponding modules. Invariants and tensors with respect to Lorentz algebra are discussed. A general mapping from $\kappa$-deformed Snyder to Snyder space is constructed. Deformed Leibniz rule, the Hopf structure and star product are found. Special cases, particularly Snyder and $\kappa$-Minkowski in Maggiore-type realizations are discussed. The same generalized Hopf algebraic structures are as well considered in the case of an arbitrary allowable kind of realisation and results are given perturbatively up to second order in deformation parameters.

arXiv comment38 pages, LaTeX2e class file

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• Remarks on simple interpolation between Jordanian twists
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• Unification of $\kappa$-Minkowski and extended Snyder spaces
• Universal $\kappa$-Poincaré covariant differential calculus over $\kappa$-Minkowski space
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• Symmetric ordering and Weyl realizations for quantum Minkowski spaces
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• Exponential Formulas, Normal Ordering and the Weyl-Heisenberg Algebra
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• A Poincaré Covariant Noncommutative Spacetime?
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