Further considerations about the traversability of thin-shell wormholes

TL;DR

This paper investigates the traversability of thin-shell wormholes within scalar-tensor theories, analyzing how parameters affect tidal forces and extrinsic curvature to improve conditions for safe travel.

Contribution

It explores the impact of scalar-tensor gravity parameters on wormhole traversability, extending previous work by considering alternative gravitational frameworks.

Findings

Tidal forces depend on scalar-tensor parameters.

Traversability conditions can be optimized by adjusting parameters.

Behavior of tides in smooth regions is characterized.

Abstract

Traversability in relation with tides in thin-shell wormholes is revisited to investigate the possibility of improving recently noted restrictive conditions for a safe travel across a wormhole throat. We consider wormholes mathematically constructed starting from background geometries which are solutions of scalar-tensor theories as dilaton gravity and Brans--Dicke gravity. The advantages of working within such frameworks are studied by examining the dependence of the extrinsic curvature and tides at the throat with the parameters determining the departure from pure relativity; the associated behaviour of tides in the smooth regions of the geometries is also analyzed. Other related but different approaches are briefly discussed in the appendices.