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Lie algebra type noncommutative phase spaces are Hopf algebroids
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For a noncommutative configuration space whose coordinate algebra is the universal enveloping algebra of a finite dimensional Lie algebra, it is known how to introduce an extension playing the role of the corresponding noncommutative phase space, namely by adding the commuting deformed derivatives in a consistent and nontrivial way, therefore obtaining certain deformed Heisenberg algebra. This algebra has been studied in physical contexts, mainly in the case of the kappa-Minkowski space-time. Here we equip the entire phase space algebra with a coproduct, so that it becomes an instance of a completed variant of a Hopf algebroid over a noncommutative base, where the base is the enveloping algebra.
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Examples of scalar extension Hopf algebroids over a universal enveloping algebra
For a finite-dimensional Lie algebra g, U(g) is a braided commutative Yetter-Drinfeld module algebra over any Hopf algebra H containing the adjoint matrix coefficients, making H smash U(g) a scalar extension Hopf alge...
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