Résumé / Abstract Seminaire_GReCO

"Eddington inspired Born-Infeld gravity: prospects, problems, and extensions"

Jan Steinhoff
Centro Multidisciplinar de Astrofísica, Instituto Superior Técnico (Lisbonne, Portugal)

Eddington inspired Born Infeld gravity theory has been revived two years ago and has the interesting feature (among others) to avoid some sort of curvature singularities. Further, the model is viable since it is completely equivalent to GR in vacuum and thus passes all experimental tests of GR. After reviewing the Eddington inspired Born Infeld modification to General Relativity, we explicitly show the degeneracy between the modification and the equation of state of the sourcing matter. We further reveal the mechanism behind the singularity avoidance process in this model. However, problems can arise in this theory by means of curvature singularities at the surface of stars. But it seems to be be possible to cure this problem by an extension of the theory. We argue that Eddington inspired Born Infeld gravity and its extensions are very useful to study modifications of the coupling between matter and gravity.

lundi 26 mai 2014 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage