Towards (3+13+1) gravity through Drinfel'd doubles with cosmological constant

We present the generalisation to (3+13+1) dimensions of a quantum deformation of the (2+12+1) (Anti)-de Sitter and Poincaré Lie algebras that is compatible with the conditions imposed by the Chern–Simons formulation of (2+12+1) gravity. Since such compatibility is automatically fulfilled by deformations coming from Drinfel'd double structures, we believe said structures are worth being analysed also in the (3+13+1) scenario as a possible guiding principle towards the description of (3+13+1) gravity. To this aim, a canonical classical r  -matrix arising from a Drinfel'd double structure for the three (3+13+1) Lorentzian algebras is obtained. This r  -matrix turns out to be a twisted version of the one corresponding to the (3+13+1) κ-deformation, and the main properties of its associated noncommutative spacetime are analysed. In particular, it is shown that this new quantum spacetime is not isomorphic to the κ-Minkowski one, and that the isotropy of the quantum space coordinates can be preserved through a suitable change of basis of the quantum algebra generators. Throughout the paper the cosmological constant appears as an explicit parameter, thus allowing the (flat) Poincaré limit to be straightforwardly obtained.