Casimir energies for spherically symmetric cavities

A general calculation of Casimir energies-in an arbitrary number of dimensi ons-for massless quantized fields in spherically symmetric cavities is carr ied out. All the most common situations, including scalar and spinor fields , the electromagnetic field and various boundary conditions are treated wit h the uppermost accuracy. The final results are given as analytical, closed expressions in terms of Barnes zeta functions. A direct numerical evaluati on of the formulae is then performed, which yields highly accurate numbers of, in principle, arbitrarily good precision.