Mass-ratio reversal in isolated binaries offers a viable formation path for GW241011-like events under specific stellar-evolution and interaction conditions.
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GWTC-5.0 reports BBH merger rate 27.5-49.4 Gpc^{-3} yr^{-1} at z=0.2, evidence for hierarchical mergers with χ~0.7 at two mass scales, mass spectrum features at 10 and 35 solar masses, and asymmetric effective spin distribution implying at least 9% aligned mergers.
Simulations with a new tidal model in COMPAS predict that merging binary black holes from isolated evolution are strongly biased to low effective spins, with one third below 0.05 and only 3% above 0.5, but the high-spin fraction rises to 15% at higher redshifts.
Black hole spin constraints for Cyg X-1 from XRISM Resolve data are strongly model-dependent, ranging from a*~0.99 with relxill to a*~0 with relxillCp or reflkerrD.
citing papers explorer
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Mass-Ratio Reversal as an Alternative to Hierarchical Mergers for GW241011
Mass-ratio reversal in isolated binaries offers a viable formation path for GW241011-like events under specific stellar-evolution and interaction conditions.
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GWTC-5.0: Population Properties of Merging Compact Binaries
GWTC-5.0 reports BBH merger rate 27.5-49.4 Gpc^{-3} yr^{-1} at z=0.2, evidence for hierarchical mergers with χ~0.7 at two mass scales, mass spectrum features at 10 and 35 solar masses, and asymmetric effective spin distribution implying at least 9% aligned mergers.
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Modern tidal interaction models for rapid binary population synthesis: II. Binary black hole formation, mergers, and spins
Simulations with a new tidal model in COMPAS predict that merging binary black holes from isolated evolution are strongly biased to low effective spins, with one third below 0.05 and only 3% above 0.5, but the high-spin fraction rises to 15% at higher redshifts.
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Model dependence of XRISM black-hole spin constraints in Cyg X-1
Black hole spin constraints for Cyg X-1 from XRISM Resolve data are strongly model-dependent, ranging from a*~0.99 with relxill to a*~0 with relxillCp or reflkerrD.