title: Casimir energy for dielectrics: spherical geometry.
abstract: An expression is produced for the Casimir energy of a dielectric medium with a spherically symmetrical dielectric discontinuity. Tests based on dielectric and geometrical limits are successful.
authors.affiliation: University of California, Los Angeles, CA 90024-1547, USA.
authors.forename: J
authors.initials: J
authors.lastname: Schwinger