Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-12-22
Commun.Math.Phys.171:383-404,1995
Physics
High Energy Physics
High Energy Physics - Theory
26 pp., LaTeX. (various misprints corrected; the q-\epsilon tensor in the q-gravity lagrangian is given explicitly)
Scientific paper
10.1007/BF02099276
We present a general method to deform the inhomogeneous algebras of the $B_n,C_n,D_n$ type, and find the corresponding bicovariant differential calculus. The method is based on a projection from $B_{n+1}, C_{n+1}, D_{n+1}$. For example we obtain the (bicovariant) inhomogeneous $q$-algebra $ISO_q(N)$ as a consistent projection of the (bicovariant) $q$-algebra $SO_q(N+2)$. This projection works for particular multiparametric deformations of $SO(N+2)$, the so-called ``minimal" deformations. The case of $ISO_q(4)$ is studied in detail: a real form corresponding to a Lorentz signature exists only for one of the minimal deformations, depending on one parameter $q$. The quantum Poincar\'e Lie algebra is given explicitly: it has 10 generators (no dilatations) and contains the {\sl classical} Lorentz algebra. Only the commutation relations involving the momenta depend on $q$. Finally, we discuss a $q$-deformation of gravity based on the ``gauging" of this $q$-Poincar\'e algebra: the lagrangian generalizes the usual Einstein-Cartan lagrangian.
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