- Conference date: 5-11 October 2000
- Location: Trieste (Itlay)
We calculate the heat kernel coefficients for the electromagnetic field in the background of a dielectric cylinder with non equal speeds of light inside and outside. The coefficient whose vanishing makes the vacuum energy of a massless field unique, turns out to be zero in dilute order, i.e., in order and nonzero beyond. As a consequence, the vanishing of the vacuum energy in the presence of a dielectric cylinder found by Casimir-Polder summation must take place irrespectively of the methods by which it might be calculated.
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