Constraints on modi?ed gravity models from white dwarfs

摘要

Modi?ed gravity theories can introduce modi?cations to the Poisson equation in the Newtonian limit. As a result, we expect to see interesting features of these modi?cations inside stellar objects. White dwarf stars are one of the most well studied stars in stellar astrophysics. We explore the effect of modi?ed gravity theories inside white dwarfs. We derive the modi?ed stellar structure equations and solve them to study the mass-radius relationships for various modi?ed gravity theories. We also constrain the parameter space of these theories from observations.