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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).

##### MSC:
 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