Using LIGO O1/O2 events, the inferred maximum black hole mass is 44 (+9, -5) solar masses under rapid cosmic metallicity evolution but 52 (+16, -9) under modest evolution, so the cutoff is model-dependent.
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The Impact of metallicity evolution of the universe on the maximum mass of LIGO binary black holes
Using LIGO O1/O2 events, the inferred maximum black hole mass is 44 (+9, -5) solar masses under rapid cosmic metallicity evolution but 52 (+16, -9) under modest evolution, so the cutoff is model-dependent.