Is SAX J1808.4-3658 a Strange Star?
Xiang‐Dong LiDepartment of Astronomy, Nanjing University, Nanjing 210093, ChinaIgnazio BombaciDipartimento di Fisica, Universitá di Pisa and I.N.F.N. Sezione di Pisa, via Buonarroti 2, I-56127 Pisa, ItalyMira DeyDepartment of Physics, Presidency College, Calcutta 700 073, IndiaJishnu DeyIFT-UNESP, 145 Rua Pamplona, São Paulo 01405-900, BrazilE. P. J. van den HeuvelAstronomical Institute, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
1999en
ABI
Аннотация
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.
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