Echoes from braneworld wormholes

Abstract

We have studied the stability of wormhole geometries, under massless scalar, electromagnetic and axial gravitational perturbations, in the context of higher dimensional spacetimes. Intriguingly, the construction of a wormhole spacetime in the presence of higher dimensions, known as braneworld wormholes, \emph{does not} require the existence of exotic matter fields, unlike the scenario in four spacetime dimensions. Being a nonvacuum spacetime, the effective potential experienced by the axial gravitational perturbation differs considerably from the scenarios involving black holes. In particular, the present work provides one of the first attempts to study the gravitational perturbations of the wormhole spacetimes. Our analysis, involving both analytical and numerical techniques, demonstrates that there are echoes in the time domain signal of all the perturbations and the echo time delay is intimately related to the parameters originating from higher dimensions. Thereby combining the attempt to search for wormholes and extra dimensions, with the existence of gravitational wave echoes. Implications and future directions have also been discussed.

32 Pages, 15 Figures

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• Gravitational atoms in the braneworld scenario
• Echoes and quasi-normal modes of perturbations around Schwarzchild traversable wormholes
• Shadows and photon spheres in static and rotating traversable wormholes
• Traversable wormholes in bi-metric gravity
• New rotating Lorentzian wormhole spacetime
• On the Interaction between Ultralight Bosons and Quantum-Corrected Black Holes
• On the uplift of 4D wormholes in Braneworld models and their 5D structure
• Energy conditions in static, spherically symmetric spacetimes and effective geometries
• Accreting Schwarzschild-like compact object: Plasma-photon interaction and stability
• Overcharging Extremal Rotating Black Holes