Casimir densities for a boundary in Robertson-Walker spacetime
  For scalar and electromagnetic fields we evaluate the vacuum expectation
value of the energy-momentum tensor induced by a curved boundary in the
Robertson--Walker spacetime with negative spatial curvature. In order to
generate the vacuum densities we use the conformal relation between the
Robertson-Walker and Rindler spacetimes and the corresponding results for a
plate moving by uniform proper acceleration through the Fulling--Rindler
vacuum. For the general case of the scale factor the vacuum energy-momentum
tensor is presented as the sum of the boundary free and boundary induced parts.
