(Im)possibility of gravitational collapse in f(R) gravity

Abstract: Gravitational collapse is still poorly understood in the context of f(R) theories of gravity. The archetypal Oppenheimer-Snyder model (which is an exact solution of General Relativity) is known to be incompatible with the junction conditions of f(R) models, both in the metric and Palatini formalisms. In this talk, we shall explain how the Oppenheimer-Snyder construction must be generalised so as to fit within f(R) theories of gravity. By means of a systematic analysis of the relevant junction conditions, we will show that some paradigmatic vacuum metrics cannot represent spacetime outside collapsing stars in f(R) gravity.

astrophysicscondensed mattergeneral relativity and quantum cosmologyhigh energy physicsmathematical physicsclassical physicsgeneral physics

Audience: researchers in the topic

Theoretical physics seminar @ Tartu