Quark Stars and Magnetic Collapse
- ICIMAF, Calle E esq 15 No. 309 Vedado (Cuba)
- Instituto de Cosmologia, Relatividade e Astrofisica (ICRA-Br), Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, Urca, CEP 22290-180, Rio de Janeiro (Brazil)
- Centro Meteorologico de Pinar del Rio (Cuba)
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.
- OSTI ID:
- 20719384
- Journal Information:
- AIP Conference Proceedings, Vol. 784, Issue 1; Conference: International conference on magnetic fields in the universe: From laboratory and stars to primordial structures, Angra dos Reis (Brazil), 28 Nov - 3 Dec 2004; Other Information: DOI: 10.1063/1.2077238; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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