SEMICLASSICAL EFFECTS IN BLACK-HOLE INTERIORS

First-order semiclassical perturbations to the Schwarzschild black hol e geometry are studied within the black hole interior; The source of t he perturbations is taken to be the Vacuum stress-energy of quantized scalar, spinor, and vector fields, evaluated using analytic approximat ions developed by Page and others (for massless : fields) and the DeWi tt-Schwinger approximation (for massive fields). Viewing the interior as an anisotropic collapsing cosmology, we nd that minimally or confor mally coupled scalar fields, and spinor fields, decrease the anisotrop y as the singularity is approached, while vector fields increase the a nisotropy. In addition, we find that for massless fields of all spins, the massive conformally coupled scalar field, and massive vector fiel ds, the metric perturbations initially strengthen the singularity, whi le for minimally coupled massive scalar and spinor fields the metric p erturbations tend to initially slow the growth of curvature.