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We consider particle creation (the Dynamical Casimir effect) in a uniformlycontracting ideal one-dimensional cavity non-perturbatively. The exactexpression for the energy spectrum of created particles is obtained and itsdependence on parameters of the problem is discussed. Unexpectedly, the numberof created particles depends on the duration of the cavity contractingnon-monotonously. This is explained by quantum interference of the events ofparticle creation which are taking place only at the moments of accelerationand deceleration of a boundary, while stable particle states exist (and thus noparticles are created) at the time of contracting.Comment: 13 pages, 4 figure

Dynamical Casimir effect in a one-dimensional uniformly contracting cavity