Echoes from phantom wormholes

TL;DR

This paper investigates how dark energy with a phantom equation of state influences wave echoes in wormholes, revealing potential observational signatures for dark energy properties through gravitational wave signals.

Contribution

It demonstrates that dark energy's equation of state affects wormhole echo signals, providing a novel way to probe dark energy locally via gravitational wave observations.

Findings

Echo delay times increase as the dark energy parameter approaches the phantom divide.

Wave echoes carry imprints of dark energy's equation of state.

Potential detection of wormhole echoes could inform dark energy measurements.

Abstract

We study the time evolution of the test scalar and electromagnetic fields perturbations in configurations of phantom wormholes surrounded by dark energy with state parameter $\omega< -1$. We observe obvious signals of echoes reflecting wormholes properties and disclose the physical reasons behind such phenomena. In particular, we find that the dark energy equation of state has a clear imprint in echoes in wave perturbations. When $\omega$ approaches the phantom divide $\omega=-1$ from below, the delay time of echoes becomes longer. The echo of gravitational wave is likely to be detected in the near future, the signature of the dark energy equation of state in the echo spectrum can serve as a local measurement of the dark energy.