Interpretation of the first order formalism of f(R)-type gravity and the corresponding second order formalism
arXiv:gr-qc/0405054 · doi:10.1393/ncb/i2004-10127-5
Abstract
f(R)-type gravity in the first order formalism is interpreted as Einstein gravity with non-minimal coupling arising from the use of unphysical frame. Identification of the corresponding second order higher-curvature gravity in the physical frame is proposed by requiring that the action is the same.
7 pages, extended and revised version of gr-qc/0309010