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Yet many observed stars spin fast in the region where this should happen.","posed_since":"","precise":"With standard shear and bulk viscosity, low-mass X-ray binaries spinning at $300\\ \\text{to}\\ 700\\ \\mathrm{Hz}$ with inferred core temperatures of about $1e8\\ \\mathrm{K}$ lie inside the r-mode instability window. Determine the extra damping (viscous crust-core boundary layer, hyperon or quark bulk viscosity, superfluid mutual friction, resonances) or the low saturation amplitude that reconciles theory with the observed spin and temperature distribution.","problem_ref":null,"references":"","settled_by":"A calculation of r-mode damping and nonlinear saturation in realistic stellar models that places the observed systems outside the window or predicts their spin-temperature distribution.","status_note":"","title":"Why do fast-spinning accreting neutron stars evade the r-mode 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