Conical Morris-Thorne Wormholes with a Global Monopole Charge

TL;DR

This paper presents a new asymptotically conical Morris-Thorne wormhole solution supported by anisotropic matter and a global monopole charge, analyzing its gravitational lensing effects and energy condition violations.

Contribution

It introduces a novel wormhole model with a global monopole charge in a scalar field framework, including a detailed lensing analysis using the Gauss-Bonnet theorem.

Findings

The deflection angle has a constant term from the monopole charge.

The wormhole violates energy conditions due to phantom energy at the throat.

Lensing deflection depends on the throat radius and a dimensionless constant.

Abstract

In this paper we have established an asymptotically conical Morris-Thorne wormhole solution supported by anisotropic matter fluid and a global monopole charge in the framework of a $1+3$ dimensional gravity minimally coupled to a triplet of scalar fields $\phi^a$, resulting from the breaking of a global $O(3)$ symmetry. For the anisotropic matter fluid we have considered the equation of state (EoS) given by $\mathcal{P}_r=\omega \rho$, with a consequence $\omega<-1$, implying a so-called phantom energy at the throat of the wormhole which violates the energy conditions. In addition, we study the weak gravitational lensing effect using the Gauss-Bonnet theorem (GBT) applied to the wormhole optical geometry. We show that the total deflection angle consists of a term given by $4\pi^2 \eta^2 $, which is independent from the impact parameter $b$, and an additional term which depends on the radius of the wormhole throat $b_0$ as well as the dimensionless constant $\zeta$.