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Deflection of light by black holes and massless wormholes in massive gravity

Weak gravitational lensing by black holes and wormholes in the context of massive gravity (Bebronne and Tinyakov, JHEP 0904:100, 2009) theory is studied. The particular solution examined is characterized by two integration constants, the mass M and an extra parameter S namely ‘scalar charge’. These black hole reduce to the standard Schwarzschild black hole solutions when the...

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

Kimet Jusufi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original ... , Macedonia 4Institute of Physics, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University of Skopje, Arhimedova 3, 1000 Skopje, Macedonia Correspondence should be addressed to Kimet

Charged thin-shell gravastars in noncommutative geometry

In this paper we construct a charged thin-shell gravastar model within the context of noncommutative geometry. To do so, we choose the interior of the nonsingular de Sitter spacetime with an exterior charged noncommutative solution by cut-and-paste technique and apply the generalized junction conditions. We then investigate the stability of a charged thin-shell gravastar under...

Quantum corrected Schwarzschild thin-shell wormhole

Recently, Ali and Khalil (Nucl Phys B, 909, 173–185, 2016), based on Bohmian quantum mechanics, derived a quantum corrected version of the Schwarzschild metric. In this paper, we construct a quantum corrected Schwarzschild thin-shell wormhole (QSTSW) and investigate the stability of this wormhole. First we compute the surface stress at the wormhole throat by applying the Darmois...

Light deflection with torsion effects caused by a spinning cosmic string

Using a new geometrical method introduced by Werner, we find the deflection angle in the weak limit approximation by a spinning cosmic string in the context of the Einstein–Cartan (EC) theory of gravity. We begin by adopting the String-Randers optical metric, then we apply the Gauss–Bonnet theorem to the optical geometry and derive the leading terms of the deflection angle in the...