Speaker
Description
In this talk, I will review two gravitational wave (GW) signatures of primordial black holes (PBHs) as candidates for dark matter. I investigate the stochastic gravitational wave background (SGWB) generated by PBHs in the dense cores of dwarf galaxies (DGs), considering both hierarchical binary black hole (BBH) mergers and close hyperbolic encounters (CHEs). We incorporate up to four successive generations of PBHs within a Hubble time and quantify the GW emission from both channels. The results show that while BBHs dominate the total emission, CHEs occur earlier, provide the first GW signals, and contribute a continuous though subdominant background that becomes relatively more significant once the initial PBH population is depleted and binary formation is suppressed. The resulting SGWB spectra demonstrate that BBHs and CHEs imprint distinct frequency dependencies consistent with analytical expectations. Finally, I compare the predicted signals with the sensitivity of observatories such as LISA, DECIGO, ET, IPTA, and SKA.
| Keyword-1 | Gravitational Waves |
|---|---|
| Keyword-2 | Dark Matter |