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The time delay operator and a related trace formula. (English) Zbl 0463.47006
Topics in functional analysis, Essays dedic. M. G. Krein, Adv. Math., Suppl. Stud. 3, 197-215 (1978).

47A40 Scattering theory of linear operators
35L05 Wave equation
47B10 Linear operators belonging to operator ideals (nuclear, \(p\)-summing, in the Schatten-von Neumann classes, etc.)
47D03 Groups and semigroups of linear operators
35P25 Scattering theory for PDEs
11F70 Representation-theoretic methods; automorphic representations over local and global fields