Kavli Affiliate: Lijing Shao
| First 5 Authors: Zexin Hu, Zexin Hu, , ,
| Summary:
The ringdown phase of the binary black hole (BBH) merger provides a clean and
direct probe of strong-field gravity and tests of the nature of black holes.
The quasinormal mode (QNM) frequencies in modified gravity theories, as well as
their amplitudes and phases, might deviate from the Kerr ones in general
relativity. Charged black holes (BHs) in Einstein-Maxwell theory provide an
excellent example of a beyond-Kerr solution with direct astrophysical and
fundamental physics applications. In this work, we extract the ringdown mode
amplitudes and phases for charged BBH mergers based on fully general
relativistic simulations with charge-to-mass ratio up to 0.3. Our results
suggest that even though the inspiral phase of charged BBHs can be
significantly accelerated or decelerated, the ringdown mode excitation only
changes mildly. We further explore the charge detectability with the
ringdown-only signal for the Einstein Telescope and Cosmic Explorer. We find
that previous studies may have overestimated the charge detectability and
including higher modes in charged waveforms is necessary for future ringdown
analysis. This constitutes the first such analysis based on waveforms generated
by numerical relativity simulations of charged BHs in full Einstein-Maxwell
theory.
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