Torsional oscillations of nonbare strange stars

Abstract

Strange stars are one of the possible compact stellar objects that can be formed after a supernova collapse. We consider a model of strange star having an inner core in the color-flavor locked phase surmounted by a crystalline color superconducting layer. These two phases constitute the {\it quarksphere}, which we assume to be the largest and heaviest part of the strange star. The next layer consists of standard nuclear matter forming a ionic crust, hovering on the top of the quarksphere and prevented from falling by a strong dipolar electric field. The dipolar electric field arises because quark matter is confined in the quarksphere by the strong interaction, but electrons can leak outside forming a few hundreds Fermi thick electron layer separating the ionic crust from the underlying quark matter. The ionic matter and the crystalline color superconducting matter constitute two electromagnetically coupled crust layers. We study the torsional oscillations of these two layers. Remarkably, we find that if a fraction larger than $10^{-4}$ of the energy of a Vela-like glitch is conveyed to a torsional oscillation, the ionic crust will likely break. The reason is that the very rigid and heavy crystalline color superconducting crust layer will absorb only a small fraction of the glitch energy, leading to a large amplitude torsional oscillation of the ionic crust.

18 pages, 10 figures

References in corpus (10)

• Color superconductivity in dense quark matter
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Cited by in corpus (10)

• Evidence for an abundant old population of Galactic ultra long period magnetars and implications for fast radio bursts
• Non-radial Oscillation Modes of Compact Stars with a Crust
• Gravitational wave echoes from strange stars
• Two-layer compact stars with crystalline quark matter: Screening effect on the tidal deformability
• Close-in Exoplanets as Candidates of Strange Quark Matter Objects
• Searching for strange quark matter objects in exoplanets
• Searching for Strange Quark Matter Objects Among White Dwarfs
• Hybrid Strangeon Stars
• Love-C relations for elastic hybrid stars
• Overview of Crystalline Color Superconductors