Wormhole Potentials and Throats from Quasi-Normal Modes

TL;DR

This paper develops an inverse method to reconstruct wormhole potentials from quasi-normal mode spectra, enabling differentiation from ultra-compact stars only with spectral data, and extends previous techniques to broader potential models.

Contribution

It introduces a new inverse approach to determine wormhole parameters from spectral data, applicable to a wider class of potentials beyond previous studies.

Findings

Reconstructed the effective potential from quasi-normal modes of wormholes.

Showed that distinguishing wormholes from ultra-compact stars requires more than spectral data.

Extended inverse methods to symmetric double barrier potentials in wave equations.

Abstract

Exotic compact objects refer to a wide class of black hole alternatives or effective models to describe phenomenologically quantum gravitational effects on the horizon scale. In this work we show how the knowledge of the quasi-normal mode spectrum of non-rotating wormhole models can be used to reconstruct the effective potential that appears in the perturbation equations. From this it is further possible to obtain the parameters that characterize the specific wormhole model, which in this paper was chosen to be the one by Damour and Solodukhin. We also address the question whether one can distinguish such type of wormholes from ultra compact stars, if only the quasi-normal mode spectrum is known. We have proven that this is not possible by using the trapped modes only, but requires additional information. The here presented inverse method is an extension of work that has previously been developed and applied to the oscillation spectra of ultra compact stars and gravastars. However, it is not limited to the study of exotic compact objects, but applicable to symmetric double barrier potentials that appear in one-dimensional wave equations. Therefore we think it can be of interest for other fields too.