Stable Dyonic Thin-Shell Wormholes in Low-Energy String Theory

Abstract

Considerable attention has been devoted to the wormhole physics in the past 30 years by exploring the possibilities of finding traversable wormholes without the need for exotic matter. In particular, the thin-shell wormhole formalism has been widely investigated by exploiting the cut-and-paste technique to merge two space-time regions and to research the stability of these wormholes developed by Visser. This method helps us to minimize the amount of the exotic matter. In this paper, we construct a four-dimensional, spherically symmetric, dyonic thin-shell wormhole with electric charge , magnetic charge , and dilaton charge Σ, in the context of Einstein-Maxwell-dilaton theory. We have applied Darmois-Israel formalism and the cut-and-paste method by joining together two identical space-time solutions. We carry out the dyonic thin-shell wormhole stability analyses by using a linear barotropic gas, Chaplygin gas, and logarithmic gas for the exotic matter. It is shown that, by choosing suitable parameter values as well as equation of state parameter, under specific conditions, we obtain a stable dyonic thin-shell wormhole solution. Finally, we argue that the stability domain of the dyonic thin-shell wormhole can be increased in terms of electric charge, magnetic charge, and dilaton charge.

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

“…[131] by adding a constant part to the classical action and choosing that constant part in a way normalizing the absorption probability to unity. [ 111,132 ] In our derivation, the same result is obtained by normalizing the emission probability to the absorption probability, namely $$$$\begin{eqnarray} \Gamma _\mu = \frac{P_{em,\mu }}{P_{ab, \mu }} = \exp {\left\lbrace -\frac{ 4\pi \omega }{\sqrt {A^\prime (r_H) B^\prime (r_H)}}\right\rbrace}, \end{eqnarray}$$$$and from this rate formula, one reads the Hawking temperature, which is inversely linked with the Boltzmann factor $$\beta$$, $$T_{H}=\beta ^{-1}$$ as $$$$\begin{align} T_H = \frac{\sqrt {A^\prime (r_H) B^\prime (r_H)}}{4 \pi }, \end{align}$$$$which differs from the Hawking temperature of Schwarzschild black hole by the presence of the conformal factor $$\varphi (r)$$ in the metric (). In fact, it takes the explicit form …”

A comparative study of new generic wormhole models with stability analysis via thin-shell

“…In terms of energy density and pressure, thin-shell mass and its radial derivatives are given as The second derivative of the potential function at x = x 0 may be used to illustrate thin-shell stability as follows: [15] (i) For stable ⇒ V″(x 0 ) > 0,…”

“…Eiroa and Aguirre [14] investigated the stability of thin-shell spherical Lorentzian WHs in f (R) theory in the background of electromagnetic field by using symmetry preserving perturbation. In the framework of Einstein-Maxwell-dilaton theory, Övgün and Jusufi [15] formed a charged spherically symmetric dyonic thin-shell WH and demonstrated that the stable domain of the dyonic thin-shell WH can be increased in terms of electric charge, dilaton charge as well as magnetic charge. Mazharimousavi [16] demonstrated that thin-shell WH cannot be formed in the black hole spacetime solution of charged f (R) theory.…”

Dynamics and Stability via Thin‐Shell of Approximated Black Holes in f(Q)$f(\mathbb {Q})$ Gravity

“…Varela [ 11 ] found stable thin‐shell WH solutions by assuming barotropic and non‐barotropic fluids. Jusufi and Ovgun [ 12 ] studied the stability of canonical acoustic thin‐shell WHs and Ovgun and Salako [ 14 ] investigated an acoustic thin‐shell WH within the context of neo‐Newtonian theory and found that changing the parameters of neo‐Newtonian theory led to stable states of the developed solution. Ovgun and Jusufi uncovered several intriguing findings while researching the stable configuration of dyonic thin‐shell WHs within the context of low‐energy string theory.…”