In the framework of inverse problems, we present an analytical solutio
n for the problem of photon generation in a cavity with a moving wall.
We give a photon distribution. With some discussions on this distribu
tion, we point out that the case when the motion index number is 2 is
of particular interest from a physical point of view and we also compu
te the corresponding spectrum of the created photons. (C) 1997 Elsevie
r Science B.V.