1. Wormhole geometries induced by action-dependent Lagrangian theories
- Author
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Ismael Ayuso, Francisco S. N. Lobo, and José P. Mimoso
- Subjects
Physics ,High Energy Physics - Theory ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Spacetime ,010308 nuclear & particles physics ,FOS: Physical sciences ,Function (mathematics) ,General Relativity and Quantum Cosmology (gr-qc) ,Lambda ,01 natural sciences ,Action (physics) ,General Relativity and Quantum Cosmology ,Gravitation ,Gravitational field ,High Energy Physics - Theory (hep-th) ,Coupling parameter ,0103 physical sciences ,Wormhole ,010306 general physics ,Astrophysics - High Energy Astrophysical Phenomena ,Mathematical physics - Abstract
In this work, we explore wormhole geometries in a recently proposed modified gravity theory arising from a non-conservative gravitational theory, tentatively denoted action-dependent Lagrangian theories. The generalized gravitational field equation essentially depends on a background four-vector $\lambda^\mu$, that plays the role of a coupling parameter associated with the dependence of the gravitational Lagrangian upon the action, and may generically depend on the spacetime coordinates. Considering wormhole configurations, by using "Buchdahl coordinates", we find that the four-vector is given by $\lambda_{\mu}=\left(0,0,\lambda_{\theta},0\right)$, and that the spacetime geometry is severely restricted by the condition $g_{tt}g_{uu}=-1$, where $u$ is the radial coordinate. We find a plethora of specific asymptotically flat, symmetric and asymmetric, solutions with power law choices for the function $\lambda$, by generalizing the Ellis-Bronnikov solutions and the recently proposed black bounce geometries, amongst others. We show that these compact objects possess a far richer geometrical structure than their general relativistic counterparts., Comment: 11 pages, 5 figures, V2: version accepted for publication in PRD
- Published
- 2023
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