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Free keywords:
General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Theory, hep-th
Abstract:
Gravitational waves open the possibility to investigate the nature of compact
objects and probe the horizons of black holes. Some models of modified gravity
predict the presence of horizonless and singularity-free compact objects. Such
dark compact objects would emit a gravitational-wave signal which differs from
the standard black hole scenario. In this chapter, we overview the
phenomenology of dark compact objects by analysing their characteristic
frequencies in the ringdown and the emission of gravitational-wave echoes in
the postmerger signal. We show that future gravitational-wave detectors will
allow us to perform model-independent tests of the black hole paradigm.