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Two different quantum processes are considered in a perturbed vacuum cavity:time refraction and dynamical Casimir effect. They are shown to be physicallyequivalent, and are predicted to be unstable, leading to an exponential growthin the number of photons created in the cavity. The concept of an effectiveUnruh acceleration for these processes is also introduced, in order to make acomparison in terms of radiation efficiency, with the Unruh radiationassociated with an accelerated frame in unbounded vacuum.

Vacuum effects in a vibrating cavity: time refraction, dynamical Casimir effect, and effective Unruh acceleration