Speaker
Description
Since the derivation of a well-defined D→4 limit for 4D Einstein-Gauss-Bonnet (4DEGB) gravity coupled to a scalar field, there has been considerable interest in testing it as an alternative to Einstein's general theory of relativity. This theory hosts interesting compact star solutions which can be smaller in radius than a Schwarzschild black hole of the same mass in general relativity (GR). We solve the field equations for such objects described by a variety of neutron/quark equations of state (EOSs) and discuss the way such the resultant mass-radius curves interact with the black hole solutions and modified Buchdahl bounds of the 4DEGB theory. For a number of the considered cases the stability under radial perturbations is also studied and we find that the stability criterion from GR (\partial M/\partial \rho_c > 0) still applies in the modified theory of gravity. With this, many of the unusual ECO solutions are indeed stable, as well as a host of solutions which overlap with recent unexplained observations of compact objects.
| Keyword-1 | compact stars |
|---|---|
| Keyword-2 | general relativity |
| Keyword-3 | astrophysics |
