The Boulware-Deser class of spacetimes radiates
We establish the result that the standard Boulware-Deser spacetime can radiate. This allows us to model the dynamics of a spherically symmetric radiating dynamical star in five-dimensional Einstein-Gauss-Bonnet gravity with three spacetime regions. The local internal region is a two-component system consisting of standard pressure-free, null radiation and an additional string fluid with energy density and nonzero pressure obeying all physically realistic energy conditions. The middle region is purely radiative which matches to a third region which is the vacuum Boulware-Deser exterior. Our approach allows for all three spacetime regions to be modeled by the same class of metric functions. A large family of solutions to the field equations are presented for various realistic equations of state. A comparison of our solutions with earlier well known results is undertaken and we show that Einstein-Gauss-Bonnet analogues of these solutions, including those of Husain, are contained in our family. We also generalise our results to higher dimensions.
General Relativity and Gravitation
- Pub Date:
- August 2017
- Equations of state;
- Boulware-Deser spacetimes;
- Radiating stars