Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-07-31
Phys.Rev.D80:083006,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Revised version, references added, 6 pages, 4 figures, accepted for publication in Physical Review D
Scientific paper
10.1103/PhysRevD.80.083006
The possible existence of compact stars made of absolutely stable strange quark matter--referred to as strange stars--was pointed out by E. Witten almost a quarter of a century ago. One of the most amazing features of such objects concerns the possible existence of ultra-strong electric fields on their surfaces, which, for ordinary strange matter, is around $10^{18}$ V/cm. If strange matter forms a color superconductor, as expected for such matter, the strength of the electric field may increase to values that exceed $10^{19}$ V/cm. The energy density associated with such huge electric fields is on the same order of magnitude as the energy density of strange matter itself, which, as shown in this paper, alters the masses and radii of strange quark stars at the 15% and 5% level, respectively. Such mass increases facilitate the interpretation of massive compact stars, with masses of around $2 M_\odot$, as strange quark stars.
Malheiro Manuel
Negreiros Rodrigo P.
Usov Vladimir V.
Weber Fridolin
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