Multimessenger data favor core stiffening that typically starts near 1.6 solar masses and reaches its peak near 2.1 solar masses, with a 2.07-solar-mass pulsar accessing the onset in 91% of draws but the peak in only 46%.
Antoniadiset al., A Massive Pulsar in a Compact Rel- ativistic Binary, Science340, 1233232 (2013)
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Which Neutron Stars Reach the Stiffening Regime? Multimessenger Constraints on Core Sound Speed and Stellar-Mass Thresholds
Multimessenger data favor core stiffening that typically starts near 1.6 solar masses and reaches its peak near 2.1 solar masses, with a 2.07-solar-mass pulsar accessing the onset in 91% of draws but the peak in only 46%.