Ghost Stars in General Relativity
Abstract
We explore an idea put forward many years ago by Zeldovich and Novikov concerning the existence of compact objects endowed with arbitrarily small mass. The energy density of such objects, which we call "ghost stars", is negative in some regions of the fluid distribution, producing a vanishing total mass. Thus, the interior is matched on the boundary surface to Minkowski space–time. Some exact analytical solutions are exhibited and their properties are analyzed. Observational data that could confirm or dismiss the existence of this kind of stellar object are discussed.
 Publication:

Symmetry
 Pub Date:
 May 2024
 DOI:
 10.3390/sym16050562
 arXiv:
 arXiv:2405.09480
 Bibcode:
 2024Symm...16..562H
 Keywords:

 relativistic fluids;
 interior solutions;
 spherically symmetric sources;
 04.40.b;
 04.40.Nr;
 04.40.Dg;
 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 19 pages Latex. Invited contribution published in Symmetry (SI: The Nuclear Physics of Neutron Stars)