Wormhole cosmic censorship

Abstract

We analyze the properties of a Kerr-like wormhole supported by phantom matter, which is an exact solution of the Einstein-phantom field equations. It is shown that the solution has a naked ring singularity which is unreachable to null geodesics falling freely from the outside. Similarly to Roger Penrose's cosmic censorship, that states that all naked singularities in the Universe must be protected by event horizons, here we conjecture from our results that a naked singularity can also be fully protected by the intrinsic properties of a wormhole's throat.

Charged thin-shell gravastars in noncommutative geometry

“…Moreover, the gravastar model has no singularity at the origin and no event horizon [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Exact rotating wormholes with ghost matter

“…Notice that f is discontinuous at the ring singularity 16 . To have a better visualization of the wormhole structure in metric (23), we define a new radial variable b r 2 = Δ 1 and set r …”

“…In general terms, we can see that null geodesics are able to avoid the naked singularity of the spacetime. The barrier protecting the singularity is dynamically induced by the same discontinuities of the metric functions 16 . Lower throat l<0 Fig.…”

Exact rotating magnetic traversable wormhole satisfying the energy conditions

“…We obtain an exact solution of the Einstein equations using this source that represents a magnetized rotating WH. This space-time has a naked ring singularity, probably untouchable as in [18], but otherwise regular. The WH throat lies on the disc bounded by the ring singularity, which keeps the throat open without requiring exotic matter, that means, satisfying all the energy conditions.…”