title: Astrophysics: quark matter in compact stars?
abstract: In a theoretical interpretation of observational data from the neutron star EXO 0748-676, Ozel concludes that quark matter probably does not exist in the centre of neutron stars. However, this conclusion is based on a limited set of possible equations of state for quark matter. Here we compare Ozel's observational limits with predictions based on a more comprehensive set of proposed quark-matter equations of state from the literature, and conclude that the presence of quark matter in EXO 0748-676 is not ruled out.
authors.affiliation: Department of Physics, Washington University, St Louis, Missouri 63130, USA. alford@wuphys.wustl.edu
authors.forename: M
authors.initials: M
authors.lastname: Alford
authors.forename: D
authors.initials: D
authors.lastname: Blaschke
authors.forename: A
authors.initials: A
authors.lastname: Drago
authors.forename: T
authors.initials: T
authors.lastname: Klähn
authors.forename: G
authors.initials: G
authors.lastname: Pagliara
authors.forename: J
authors.initials: J
authors.lastname: Schaffner-Bielich