Jensen, Arne; Mourre, Éric; Perry, Peter Multiple commutator estimates and resolvent smoothness in quantum scattering theory. (English) Zbl 0561.47007 Ann. Inst. Henri Poincaré, Phys. Théor. 41, 207-225 (1984). Let H be a selfadjoint operator with domain \({\mathcal D}(H)\) in a Hilbert space \({\mathcal H}\). H is said to admit A as a conjugate operator at \(E\in R\), if A is a selfadjoint operator satisfying certain domain conditions, and if, furthermore, the following operator estimate holds: \[ (*)\quad E_ H(J)i[H,A]E_ H(J)\geq \alpha E_ H(J)+K. \] Here \(E_ H\) denotes the spectral measure of H, \(J=(E-\delta\), \(E+\delta)\), \(\delta >0\), \(\alpha >0\), and K is compact. One furthermore assumes that the multiple commutators \(i[i[H,A],A]...\) up to order n define bounded operators from \({\mathcal D}(H)\) (graph norm) to \({\mathcal H}\). A weaker condition is also needed on the \((n+1)\)-fold commutator. The main results are that the boundary values \(R(\alpha \pm i0)=\lim_{\epsilon \downarrow 0}(H-\lambda \mp i\epsilon)^{-1}\) exist and are \(C^ n\) w.r.t. \(\lambda\) in suitable spaces defined using A. Here \(\lambda \in J\setminus \sigma_ p(H),\) where \(\sigma_ p(H)\) denotes the point spectrum of H. Under condition (*) \(\sigma_ p(H)\) is known to be discrete in J. Detailed results are too complicated to be stated here. The applications include an abstract scattering theory using a conjugate operator, and a proof of completeness of modified wave operators for certain Schrödinger operators with long range potentials. Cited in 2 ReviewsCited in 67 Documents MSC: 47A40 Scattering theory of linear operators 47A10 Spectrum, resolvent 81U05 \(2\)-body potential quantum scattering theory 47F05 General theory of partial differential operators 47B47 Commutators, derivations, elementary operators, etc. Keywords:selfadjoint operator; conjugate operator; spectral measure; multiple commutators; abstract scattering theory; completeness of modified wave operators for certain Schrödinger operators with long range potentials × Cite Format Result Cite Review PDF Full Text: Numdam EuDML References: [1] S. Agmon , Some new results in spectral and scattering theory of differential operators on L2(Rn) . Séminaire Goulaouic-Schwartz , 1978/1979 . Exp. No. 2, École Polytech ., Palaiseau , 1979 . Numdam | MR 557513 | Zbl 0406.35052 · Zbl 0406.35052 [2] J. Aguilar , J.M. Combes , Comm. Math. Phys. , t. 22 , 1971 , p. 269 - 279 . Article | MR 345551 | Zbl 0219.47011 · Zbl 0219.47011 · doi:10.1007/BF01877510 [3] E. 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