Global monopoles in the extended Gauss-Bonnet gravity

Chatzifotis, Nikos; Mavromatos, Nikolaos; Theodosopoulos, Dionysios P.

doi:10.1103/physrevd.107.085014

Cited by 9 publications

(1 citation statement)

References 34 publications

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“…As expected, the majority of analytical solutions for compact objects in Horndeski theories have been obtained within the subclass of theories that enjoy parity symmetry ϕ → −ϕ and/or shift symmetry ϕ → ϕ + cst [54,[67][68][69][70][71][72][73][74]. However, under physical grounds there are no compelling reasons to restrict ourselves to theories with such symmetries, and in consequence, this freedom opens the possibility to explore spacetime geometries with quite different properties than GR [75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92]. In this scenario, there is a potential risk of dealing with much more involved field equations, precluding the existence of analytical solutions.…”

Section: Introductionmentioning

confidence: 97%

Stealth Ellis wormholes in Horndeski theories

Bakopoulos,

Chatzifotis,

Erices

et al. 2023

J. Cosmol. Astropart. Phys.

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In this work we are revisiting the well studied Ellis wormhole solution in a Horndeski theory motivated from the Kaluza-Klein compactification procedure of the more fundamental higher dimensional Lovelock gravity. We show that the Ellis wormhole is analytically supported by a gravitational theory with a non-trivial coupling to the Gauss-Bonnet term and we expand upon this notion by introducing higher derivative contributions of the scalar field. The extension of the gravitational theory does not yield any back-reacting component on the spacetime metric, which establishes the Ellis wormhole as a stealth solution in the generalized framework. We propose two simple mechanisms that dress the wormhole with an effective ADM mass. The first procedure is related to a conformal transformation of the metric which maps the theory to another Horndeski subclass, while the second one is inspired by the spontaneous scalarization effect on black holes.

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