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Whispers from the Early Universe: The Ringdown of Primordial Black Holes
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Whispers from the Early Universe: The Ringdown of Primordial Black Holes
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We investigate the stochastic gravitational wave background (SGWB) generated by the ringdown phase of primordial black holes (PBHs) formed in the early universe. As the ringdown signal is independent of the PBH formation mechanism, the resulting SGWB offers a model-independent probe of PBHs. We numerically compute the ringdown waveform and derive the corresponding SGWB. We show that such a signal could be detected by future pulsar timing arrays (PTAs) for PBHs heavier than the solar mass. Additionally, we evaluate the SGWB from binary PBH mergers and demonstrate that it lies within the sensitivity bands of next-generation ground-based interferometers such as Cosmic Explorer and Einstein Telescope, suggesting a multi-band observational strategy for probing the PBH dark matter scenario.
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Cited by 1 Pith paper
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Refining primordial black hole dark matter constraints with dust heating: the role of spin and halo profile dependence
Dust-heating constraints on PBH dark matter tighten to f_PBH ≈ 10^-4 when PBH spin is included, with the strongest limits for the Isothermal halo profile and weakest for Burkert.
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