2011

Compact stars in alternative theories of gravity. Einstein-Dilaton-Gauss-Bonnet gravity

Pani, Paolo, Berti, Emanuele, Cardoso, Vitor et al.

Understand

We develop a theoretical framework to study slowly rotating compact stars in a rather general class of alternative theories of gravity, with the ultimate goal of investigating constraints on alternative theories from electromagnetic and gravitational-wave observations of compact stars.

Our Lagrangian includes as special cases scalar-tensor theories (and indirectly f(R) theories) as well as models with a scalar field coupled to quadratic curvature invariants.
As a first application of the formalism, we discuss (for the first time in the literature) compact stars in Einstein-Dilaton-Gauss-Bonnet gravity.
We show that compact objects with central densities typical of neutron stars cannot exist for certain values of the coupling constants of the theory.

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