For anisotropic quark stars in full general relativity, f-mode frequency scales linearly with the square root of average density, and normalized damping time follows a linear trend with compactness, with anisotropy shifting both relations.
Recycling strange stars to millisecond periods
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abstract
Recycling strange stars to millisecond periods is studied within the framework of general relativity. We employ equations of state of strange quark matter based on the MIT Bag Model, with massive strange quarks and lowest order QCD interactions. The presence of the crust of normal matter is taken into account, with a bottom density assumed to be equal to the neutron-drip one. The calculations are performed by solving the exact 2-D equations for rigidly rotating stationary configurations in general relativity. Evolutionary tracks of accreting strange stars are computed, and their dependence on the initial strange star mass and on the fraction of the angular momentum transferred to the star from the infalling matter, is studied. The differences between recycling strange stars and neutron stars are pointed out.
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Quasi-normal f-modes of anisotropic quark stars in full general relativity
For anisotropic quark stars in full general relativity, f-mode frequency scales linearly with the square root of average density, and normalized damping time follows a linear trend with compactness, with anisotropy shifting both relations.