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gr-qc1994
Stability Properties of the Starobinsky Cosmological Model
U. Kasper, S. Kluske, M. Rainer +2
We discuss the instabilities appearing in the cosmological model with a quasi de Sitter phase following from a fourth-order gravity theory. Both the classical equation as well as t…
gr-qc1994
Why do all the curvature invariants of a gravitational wave vanish ?
Hans - Jürgen Schmidt
We prove the theorem valid for (Pseudo)-Riemannian manifolds : "Let be a fixed point of a homothetic motion which is not an isometry then all curvature invariants…