Phys. Rev. Lett. 83, 3776–3779 (1999)Is SAX J1808.4-3658 a Strange Star?Received 23 November 1998; revised 5 April 1999; published in the issue dated 8 November 1999 The possibility of strange stars is one of the most important issues in the study of compact objects. Here we use the observations of the newly discovered millisecond x-ray pulsar SAX J1808.4-3658 to constrain the radius of the compact star. Comparing the mass-radius relation of SAX J1808.4-3658 with theoretical models for both neutron stars and strange stars, we argue that a strange star model could be more consistent with SAX J1808.4-3658, and suggest that it is a likely strange star candidate. Our results are useful in constraining microscopic chiral symmetry restoration parameters in the quantum chromodynamics (QCD) modeling of strange matter. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.3776
DOI:
10.1103/PhysRevLett.83.3776
PACS:
98.70.Rz, 12.38.Mh, 26.60.+c, 97.60.Gb
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