Do Strange Stars Exist in the Universe?

Abstract

Abstract. Definitely, an affirmative answer to this question would have implications of fundamental importance for astrophysics (a new class of compact stars), and for the physics of strong interactions (deconfined phase of quark matter, and strange matter hypothesis). In the present work, we use observational data for the newly discovered millisecond Xray pulsar SAX J1808.4-3658 and for the atoll source 4U 1728-34 to constrain the radius of the underlying compact stars. Comparing the massradius relation of these two compact stars with theoretical models for both neutron stars and strange stars, we argue that a strange star model is more consistent with SAX J1808.4-3658 and 4U 1728-34, and suggest that they are likely strange star candidates.

Are radio pulsars strange stars ?

“…In so far as our constraints hold, can we then conclude that BPAL12 is the neutron star EOS ? Actually BPAL12 is used as an extreme case for illustrative purpose and can hardly be called a realistic netron star EOS (Bombaci 2000). In fact our present knowledge of the neutron star EOS is very far from final.…”