Strange Quark Matter in Neutron Stars? - New Results from Chandra and XMM

Abstract

It has been predicted that quark and hybrid stars, containing strange quark matter in their core, have a significantly smaller radius than ordinary neutron stars. Preliminary X-ray observations of isolated neutron stars indicated a surprisingly small radius consistent with quark matter in the interior of the star. However, a new analysis of the data led to a radius corresponding to an ordinary neutron star. In the present talk we will discuss theoretical calculations of the mass-radius relation for quark and hybrid stars, taking into account medium effects in quark matter, and report on recent X-ray observations by Chandra and XMM and their latest interpretation.

7 pages, 4 figures, final version to be published in the SQM 2003 proceedings

References in corpus (8)

• A new method to study lattice QCD at finite temperature and chemical potential
• Small, Dense Quark Stars from Perturbative QCD
• Is RX J185635-375 a Quark Star?
• The thermal radiation of the isolated neutron star RX J1856.5-3754 observed with Chandra and XMM-Newton
• A Revised Parallax and its Implications for RX J185635-3754
• A broad absorption feature in the X-ray spectrum of the isolated neutron star RBS1223 (1RXS J130848.6+212708)
• Thermal Featureless Spectrum: Evidence for Bare Strange Stars
• The Equation of State for Dense QCD and Quark Stars

Cited by in corpus (5)

• Light curves and polarization of accretion- and nuclear-powered millisecond pulsars
• Dense baryonic matter: constraints from recent neutron star observations
• Gravitational Waves from Phase-Transition Induced Collapse of Neutron Stars
• (Anti)kaon condensation in strongly magnetized dense matter
• What can we learn from electromagnetic plasmas about the quark-gluon plasma?