Résumé / Abstract Seminaire_GReCO

"Singularity cloaking in higher-derivative tensor-scalar theories"

Blaise Goutéraux
Nordic Inst. Theoretical Physics (NORDITA) (Copenhague, Danemark)

In this talk, we shall describe how higher-derivative terms in the gravity-scalar sector can lead to various resolutions of singular geometries. Focussing first on higher-dimensional Gauss-Bonnet gravity, we review how the higher-dimensional term: either leads to a regular background for maximally symmetric horizons; or cloaks the curvature singularity for horizons which are Einstein spaces. Combining this with dimensional reduction techniques, we then extend this discussion to the scalar-tensor sector in the context of recently popularised theories modifying gravity (Galileons). Background curvature singularities which cannot be resolved by dimensional uplifting are cloaked by the higher-derivative terms.

lundi 17 décembre 2012 - 11:00
Salle des séminaires François Arago,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage