Quark Stars and Magnetic Collapse

Details Quark Stars and Magnetic Collapse Quark Stars and Magnetic Collapse

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..784..705p&link_type=abstract

MAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures. AIP Conference Proceedings, Volume 784, pp

Other

Quark Matter, Magnetic Fields, Neutron Stars, Pulsars, X-Ray Sources (Astronomical), Magnetic And Electric Fields, Polarization Of Starlight, Neutron Stars, Pulsars, Origin, Formation, And Abundances Of The Elements, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Quantum Electrodynamics

Scientific paper

Quark matter is expected to exist in the interior of compact stellar objects as neutron stars or even the more exotic strange stars, based on the Bodmer-Witten conjecture. Bare strange quark stars and (normal) strange quark-matter stars, those possessing a baryon (electron) crust, are hypothesized as good candidates to explain the properties of a set of peculiar stellar sources as the enigmatic X-ray source RX J1856.5-3754, some pulsars as PSR B1828-11 and PSR B1642-03 (Xu 2003), and the anomalous X-ray pulsars and soft gamma-ray repeaters (Zhang et al. 2000). In the MIT bag model, quarks are treated as a degenerate Fermi gas confined to a region of space having a vacuum energy density Bbag (the Bag constant). In this note, we modified the MIT Bag Model by including the electromagnetic interaction. We also show that this version of the MIT model implies the anisotropy of the Bag pressure due to the presence of the magnetic field. The equations of state of degenerate quarks gases are studied in the presence of ultra strong magnetic fields. The behavior of a system made-up of quarks having (or not) an anomalous magnetic moment is reviewed. A structural instability is found, which is related to the anisotropic nature of the pressures in this highly magnetized matter. The conditions for the collapse of this system are obtained and compared to a previous model of neutron stars build-up on a neutron gas having anomalous magnetic moment.

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