Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-01-28
Class. Quantum Grav. 27 (2010) 114104
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
20 pages; accepted to the Classical and Quantum Gravity special issue for MICRA2009
Scientific paper
10.1088/0264-9381/27/11/114104
We present new results on instabilities in rapidly and differentially rotating neutron stars. We model the stars in full general relativity and describe the stellar matter adopting a cold realistic equation of state based on the unified SLy prescription. We provide evidence that rapidly and differentially rotating stars that are below the expected threshold for the dynamical bar-mode instability, beta_c = T/|W| ~ 0.25, do nevertheless develop a shear instability on a dynamical timescale and for a wide range of values of beta. This class of instability, which has so far been found only for small values of beta and with very small growth rates, is therefore more generic than previously found and potentially more effective in producing strong sources of gravitational waves. Overall, our findings support the phenomenological predictions made by Watts, Andersson and Jones on the nature of the low-T/|W|.
Bernuzzi Sebastiano
Corvino Giovanni
Giacomazzo Bruno
Pietri Roberto de
Rezzolla Luciano
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