Laguerre-type derivatives: Dobinski relations and combinatorial identities

Details Laguerre-type derivatives: Dobinski relations and combinatorial identities Laguerre-type derivatives: Dobinski relations and combinatorial identities

2009-04-02

arxiv.org/abs/0904.0369v1

J. Math. Phys. 50, 083512 (2009)

Physics

Mathematical Physics

14 pages, 1 figure

Scientific paper

We consider properties of the operators D(r,M)=a^r(a^\dag a)^M (which we call generalized Laguerre-type derivatives), with r=1,2,..., M=0,1,..., where a and a^\dag are boson annihilation and creation operators respectively, satisfying [a,a^\dag]=1. We obtain explicit formulas for the normally ordered form of arbitrary Taylor-expandable functions of D(r,M) with the help of an operator relation which generalizes the Dobinski formula. Coherent state expectation values of certain operator functions of D(r,M) turn out to be generating functions of combinatorial numbers. In many cases the corresponding combinatorial structures can be explicitly identified.

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