SCALE FACTOR DUALITIES IN ANISOTROPIC COSMOLOGIES

The concept of scale factor duality is considered within the context o f the spatially homogeneous, vacuum Brans-Dicke cosmologies. In the Bi anchi class A, it is found that duality symmetries exist for the types I, II, VI0, VII0, but not for types VIII and IX. The Kantowski-Sachs and locally rotationally symmetric Bianchi type III models also exhibi t a scale factor duality, but no such symmetries are found for the Bia nchi type V. In this way anisotropy and spatial curvature may have imp ortant effects on the nature of such dualities.