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Negative energy and stability in scalar-tensor gravity
Valerio Faraoni
Linearized gravitational waves in Brans-Dicke and scalar-tensor theories carry negative energy. A gauge-invariant analysis shows that the background Minkowski space is stable at th…
de Sitter attractors in generalized gravity
Valerio Faraoni
We obtain conditions for the existence and stability of de Sitter attractors in the phase space of spatially homogeneous and isotropic cosmology in generalized theories of gravity…
Coupled oscillators as models of phantom and scalar field cosmologies
Valerio Faraoni
We study a toy model for phantom cosmology recently introduced in the literature and consisting of two oscillators, one of which carries negative kinetic energy. The results are co…
Singularities in scalar-tensor gravity
Valerio Faraoni
The analysis of certain singularities in scalar-tensor gravity contained in a recent paper is completed, and situations are pointed out in which these singularities cannot occur.