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Possible evidence of quark matter in neutron star X-ray binaries
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We study the spin evolution of X-ray neutron stars in binary systems, which are being spun up by mass transfer from accretion disks. Our investigation reveals that a quark phase transition resulting from the changing central density induced by the changing spin, can lead to a pronounced peak in the frequency distribution of X-ray neutron stars. This finding provides one of several possible explanations available in the literature, or at least a contributor to part of the observed anomalous frequency distribution of neutron stars in low-mass X-ray binaries (LMXBs), which lie in a narrow band centered at about 300 Hz, as found by the Rossi Explorer (RXTE).
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Fastest spinning millisecond pulsars: indicators for quark matter in neutron stars?
Hybrid stars with color-superconducting quark matter can reproduce the mass and spin of pulsar J0952-0607, whereas the hadronic-only model cannot, and the revised Kepler-frequency relation tightens radius bounds.
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