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Twisted (2+1) $\kappa$-AdS Algebra, Drinfel'd Doubles and Non-Commutative Spacetimes
Symmetry, integrability and geometry: methods and applications, Tome 10 (2014) Cet article a éte moissonné depuis la source Math-Net.Ru

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We construct the full quantum algebra, the corresponding Poisson–Lie structure and the associated quantum spacetime for a family of quantum deformations of the isometry algebras of the (2+1)-dimensional anti-de Sitter (AdS), de Sitter (dS) and Minkowski spaces. These deformations correspond to a Drinfel'd double structure on the isometry algebras that are motivated by their role in (2+1)-gravity. The construction includes the cosmological constant $\Lambda$ as a deformation parameter, which allows one to treat these cases in a common framework and to obtain a twisted version of both space- and time-like $\kappa$-AdS and dS quantum algebras; their flat limit $\Lambda\to 0$ leads to a twisted quantum Poincaré algebra. The resulting non-commutative spacetime is a nonlinear $\Lambda$-deformation of the $\kappa$-Minkowski one plus an additional contribution generated by the twist. For the AdS case, we relate this quantum deformation to two copies of the standard (Drinfel'd–Jimbo) quantum deformation of the Lorentz group in three dimensions, which allows one to determine the impact of the twist.
Keywords: (2+1)-gravity; deformation; non-commutative spacetime; anti-de Sitter; cosmological constant; quantum groups; Poisson–Lie groups; contraction. 
@article{SIGMA_2014_10_a51,
     author = {\'Angel Ballesteros and Francisco J. Herranz and Catherine Meusburger and Pedro Naranjo},
     title = {Twisted (2+1) $\kappa${-AdS} {Algebra,} {Drinfel'd} {Doubles} and {Non-Commutative} {Spacetimes}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2014},
     volume = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2014_10_a51/}
}
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Ángel Ballesteros; Francisco J. Herranz; Catherine Meusburger; Pedro Naranjo. Twisted (2+1) $\kappa$-AdS Algebra, Drinfel'd Doubles and Non-Commutative Spacetimes. Symmetry, integrability and geometry: methods and applications, Tome 10 (2014). http://geodesic.mathdoc.fr/item/SIGMA_2014_10_a51/

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