Hierarchical triple mergers: testing Hawking's area theorem with the inspiral signals
arXiv:2209.03631 · doi:10.1093/mnras/stad1676
Abstract
Hawking's area theorem is one of the fundamental laws of black holes (BHs), which has been tested at a confidence level of with gravitational wave (GW) observations by analysing the inspiral and ringdown portions of GW signals, independently. In this work, we propose to carry out the test in a new way with the hierarchical triple merger (i.e., two successive BH mergers occurred sequentially within the observation window of GW detectors), for which the properties of the progenitor BHs and the remnant BH of the first coalescence can be inferred from the inspiral portions of the two mergers. As revealed in our simulations, the BH area law can be well confirmed for some plausible hierarchical triple merger events detectable in LIGO/Virgo/KAGRA/LIGO-India's O4/O5 runs. Our proposed method provides significant facilitation for testing the area law and complements previous methods.
arXiv comment8 pages, 8 figures, 2 tables, published in MNRAS
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