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Positive frequency Wightman function, vacuum expectation values of the fieldsquare and the energy-momentum tensor induced by a Z_{2}-symmetric brane withfinite thickness located on (D+1)- dimensional AdS background are evaluated fora massive scalar field with general curvature coupling parameter. For thegeneral case of static plane symmetric interior structure the expectationvalues in the region outside the brane are presented as the sum of free AdS andbrane induced parts. For a conformally coupled massless scalar the braneinduced part in the vacuum energy-momentum tensor vanishes. In the limit ofstrong gravitational fields the brane induced parts are exponentiallysuppressed for points not too close to the brane boundary. As an application ofgeneral results a special model is considered in which the geometry inside thebrane is a slice of the Minkowski spacetime orbifolded along the directionperpendicular to the brane. For this model the Wightman function, vacuumexpectation values of the field square and the energy-momentum tensor insidethe brane are evaluated as well and their behavior is discussed in variousasymptotic regions of the parameters. It is shown that for both minimally andconformally coupled scalar fields the interior vacuum forces acting on thebrane boundaries tend to decrease the brane thickness.

Wightman function and vacuum densities for a Z_2-symmetric thick brane in AdS spacetime