Detecting properties of echoes from inspiraling stage with ground-based detectors

TL;DR

This paper demonstrates that gravitational wave signals from inspiraling extreme-mass-ratio binaries can reveal properties of exotic compact objects with hard surfaces, potentially surpassing current constraints once detected by advanced observatories.

Contribution

It introduces a model predicting detectable echoes during inspiral phase, enabling better constraints on exotic compact objects' surface properties with future gravitational wave detections.

Findings

Detectable gravitational wave signals from hard surfaces during inspiral.

Potential to constrain exotic compact objects' properties more effectively.

Model applicable to upcoming gravitational wave observatories.

Abstract

The nature of black holes is one of most exciting issues in gravitational physics. If there is an exotic compact object as the compact as a black hole but without a horizon, gravitational wave echoes may be produced after the merger. In this work, we show that for extreme-mass-ratio binaries, even during the inspiraling phase of compact binary coalescence, the exists of hard surface of the exotic compact object will produce detectable signals on the gravitational waves. We predict that once the LIGO-Virgo-KAGRA, Einstein Telescope or Cosmic Explorer detect such kind of sources, our model shows that one can constrain the properties of surfaces of the compact objects in inspiraling stage better than the current level.