RT Journal Article T1 Trace formulas for the Casimir operators of the unextended Schrödinger algebra S(N) A1 Campoamor Stursberg, Otto-Rudwig AB Using the contraction of the centrally extended Schrödinger algebrâS(N) onto the Lie algebra S(N) ⊕ R in combination with the Newton identities associated with the characteristic polynomial of a matrix, we derive explicit expressions for the Casimir operators of the unextended Schrödinger algebra S(N) in terms of trace operators. It is shown that these operators can be defined independently of the contraction from which a direct method for the computation of the S(N)-invariants is deduced. PB American Institute of Physics SN 0022-2488 YR 2020 FD 2020-04-27 LK https://hdl.handle.net/20.500.14352/7291 UL https://hdl.handle.net/20.500.14352/7291 LA eng NO Ministerio de Ciencia, Innovación y Universidades (España)/Fondo Europeo de Desarrollo Regional DS Docta Complutense RD 7 jul 2025