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Campoamor Stursberg, Otto-Rudwig Low, S. G. 2023-06-20T03:32:18Z 2023-06-20T03:32:18Z 2009 1751-8113 10.1088/1751-8113/42/6/065205 https://hdl.handle.net/20.500.14352/43785 https//doi.org/10.1088/1751-8113/42/6/065205 http://iopscience.iop.org/1751-8121/42/6/065205/ Given a semidirect product g = s ⊎ r of semisimple Lie algebras s and solvable algebras r, we construct polynomial operators in the enveloping algebra U(g) of g that commute with r and transform like the generators of s, up to a functional factor that turns out to be a Casimir operator of r. Such operators are said to generate a virtual copy of s in U(g), and allow to compute the Casimir operators of g in closed form, using the classical formulae for the invariants of s. The behavior of virtual copies with respect to contractions of Lie algebras is analyzed. Applications to the class of Hamilton algebras and their inhomogeneous extensions are given. eng open access Virtual copies of semisimple Lie algebras in enveloping algebras of semidirect products and Casimir operators journal article