Wormholes, naked singularities and universes of ghost radiation

TL;DR

This paper explores solutions in ghost radiation fields, revealing conditions for naked singularities and wormholes, including positive mass wormholes, and describes homogeneous solutions as open universes.

Contribution

It generalizes static and homogeneous metrics for ghost radiation, identifying conditions for naked singularities and wormholes, and introduces solutions with positive mass.

Findings

Static solutions include naked singularities and wormholes.

Critical parameter value separates singularities from wormholes.

Homogeneous solutions describe open universes.

Abstract

Both the static and homogeneous metrics describing the spherically symmetric gravitational field of a crossflow of incoming and outgoing null dust streams are generalized for the case of the two-component ghost radiation. Static solutions represent either naked singularities or the wormholes recently found by Hayward. The critical value of the parameter separating the two possibilities is given. The wormhole is allowed to have positive mass. The homogeneous solutions are open universes.