Dilatonic wormholes: construction, operation, maintenance and collapse to black holes

TL;DR

This paper explores the theoretical construction, operation, and collapse of traversable wormholes supported by exotic ghost fields within a generalized two-dimensional dilaton gravity model, providing explicit solutions and dynamic processes.

Contribution

It introduces explicit, integrable models of dynamic wormhole processes supported by ghost fields, including their creation, operation, maintenance, and collapse into black holes.

Findings

Static wormholes can be created by irradiating black holes with ghost fields.

Wormholes can be operated to transport matter and stabilized by adjusting ghost fields.

Turning off the ghost field causes wormholes to collapse into black holes.

Abstract

The CGHS two-dimensional dilaton gravity model is generalized to include a ghost Klein-Gordon field, i.e. with negative gravitational coupling. This exotic radiation supports the existence of static traversible wormhole solutions, analogous to Morris-Thorne wormholes. Since the field equations are explicitly integrable, concrete examples can be given of various dynamic wormhole processes, as follows. (i) Static wormholes are constructed by irradiating an initially static black hole with the ghost field. (ii) The operation of a wormhole to transport matter or radiation between the two universes is described, including the back-reaction on the wormhole, which is found to exhibit a type of neutral stability. (iii) It is shown how to maintain an operating wormhole in a static state, or return it to its original state, by turning up the ghost field. (iv) If the ghost field is turned off, either instantaneously or gradually, the wormhole collapses into a black hole.