Echoes from phantom wormholes

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. < -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. 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, and the signature of the dark energy equation of state in the echo spectrum can serve as a local measurement of the dark energy.

Automated summary

The study reveals the obvious signals of echoes around phantom wormholes, reflecting their properties and uncovering the physical reasons behind such phenomena. As the state parameter of dark energy approaches the phantom divide, the delay time of echoes becomes longer, affecting the characteristics and detection of echo signals. The echo of gravitational waves is expected to be detected in the near future, and the signature of the dark energy equation of state in the echo spectrum can serve as a local measurement of dark energy.