TY  - JOUR
A1  - Kleinert, Hagen
A1  - Schmidt, Hans-Jürgen
T1  - Cosmology with curvature-saturated gravitational lagrangian
N2  - We argue that the Lagrangian L(R) for gravity should remain bounded at large curvature, and interpolate between the weak-field tested Einstein-Hilbert Lagrangian and a pure cosmological constant for large R with the curvature- saturated ansatz. The curvature-dependent effective gravitational constant tends to infinity for large R, in contrast to most other approaches where it tends to 0. The theory possesses neither ghosts nor tachyons, but it fails to be linearization stable. On the technical side we show that two different conformal transformations make L asymptotically equivalent to the Gurovich-ansatz on the one hand, and to Einstein's theory with a minimally coupled scalar field with self-interaction on the other.
Y1  - 2002
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/17003
UR  - http://arXiv.org/abs/gr-qc/0006074
ER  -