Lp. Chimento, STABILITY OF THE INFLATION IN R(2) COSMOLOGY WITH MASSLES CONFORMAL QUANTUM-FIELDS, Astrophysics and space science, 218(1), 1994, pp. 59-63
A semiclassical higher-derivative theory of gravity is investigated fo
r conformally invariant free quantum fields in homogeneous and isotrop
ic spacetime with no cosmological constant nor classical source. In th
e spatially flat case the stability of the de Sitter solution is studi
ed. Moreover, the Minkowski solution is found to be unstable.