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Gravitational-wave signatures from mergers and evaporation in this scenario

Predict and quantify the gravitational-wave signals produced by (a) binary mergers of the dark compact objects and sub-solar-mass black holes formed in this dissipative dark sector, and (b) energy injection from primordial black hole evaporation, and assess their detectability with current and future gravitational-wave observatories.

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Background

Beyond exotic early-Universe dynamics, the scenario yields compact objects and PBHs whose mergers could source detectable gravitational waves. Additionally, PBH evaporation can modify the stochastic gravitational-wave background.

A dedicated analysis is needed to connect predicted populations and formation times to GW spectra, merger rates, and observational sensitivities.

References

Finally, in addition to the GW emission from the exotic cosmology, binary mergers of both the compact objects and black holes produced in this scenario would give rise to GW emissions. Furthermore, the evaporation of PBHs can also affect the background of stochastic GWs. We leave these considerations for future studies.

— Dissipative Dark Cosmology: From Early Matter Dominance to Delayed Compact Objects (2405.04575 - Bramante et al., 7 May 2024) in Section 5 (Phenomenological implications)