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Smooth derivations commuting with Lie group actions
Journal article

Smooth derivations commuting with Lie group actions

F. M Goodman, P. E. T Jorgensen and C Peligrad
Mathematical proceedings of the Cambridge Philosophical Society, Vol.99(2), pp.307-314
03/1986
DOI: 10.1017/S0305004100064227

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Abstract

N. S. Poulsen, motivated in part by questions from relativistic quantum scattering theory, studied symmetric operators S in Hilbert space commuting with a unitary representation U of a Lie group G. (The group of interest in the physical setting is the Poincaré group.) He proved ([17], corollary 2·2) that if S is defined on the space of C∞-vectors for U (i.e. D(S) ⊇ ℋ∞(U)), then S is essentially self-adjoint.

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