Evolving wormhole geometries

Evolving wormhole geometries

In the last two decades, there has been a revival on the study of classical wormhole solutions either in General Relativity (GR) or in alternative theories of gravitation. A cornerstone in this revival has been the paper of Morris and Thorne [1] in which, they derived the properties that a space-time must have in order to hold up such a geometry. Let us recall that the most salient feature of t...

Higher Dimensional Wormhole Geometries with Compact Dimensions

This paper studies wormhole solutions to Einstein gravity with an arbitrary number of time dependent compact dimensions and a matter-vacuum boundary. A new gauge is utilized which is particularly suited for studies of the wormhole throat. The solutions possess arbitrary functions which allow for the description of infinitely many wormhole systems of this type and, at the stellar boundary, the m...

Quantum field theory constrains traversable wormhole geometries.

Recently a bound on negative energy densities in four-dimensional Minkowski spacetime was derived for a minimally coupled, quantized, massless, scalar field in an arbitrary quantum state. The bound has the form of an uncertainty principle-type constraint on the magnitude and duration of the negative energy density seen by a timelike geodesic observer. When spacetime is curved and/or has boundar...

On a General Class of Wormhole Geometries

A general class of solutions is obtained which describe a spherically symmetric wormhole system. The source of the stress-energy supporting the structure consists of an anisotropic brown dwarf “star” which smoothly joins vacuum and may possess arbitrary cosmological constant. It is demonstrated how this set of solutions allow for a non-zero energy density and therefore positive stellar mass as ...

Wormhole geometries in modified teleparallel gravity and theenergy conditions