155 citations · 462 across the 9 of their papers we have counts for
9 papers
Differential rotation of the unstable nonlinear r-modes
John L. Friedman, Lee Lindblom, Keith H. Lockitch
At second order in perturbation theory, the -modes of uniformly rotating stars include an axisymmetric part that can be identified with differential rotation of the background s…
The rotational modes of relativistic stars: Numerical results
K. H. Lockitch, J. L. Friedman, N. Andersson
We study the inertial modes of slowly rotating, fully relativistic compact stars. The equations that govern perturbations of both barotropic and non-barotropic models are discussed…
Regularizing the r-mode problem for nonbarotropic relativistic stars
K. H. Lockitch, N. Andersson, A. L. Watts
We present results for r-modes of relativistic nonbarotropic stars. We show that the main differential equation, which is formally singular at lowest order in the slow-rotation exp…
A cure for unstable numerical evolutions of single black holes: adjusting the standard ADM equations
Bernard Kelly, Pablo Laguna, Keith Lockitch +4
Numerical codes based on a direct implementation of the standard ADM formulation of Einstein's equations have generally failed to provide long-term stable and convergent evolutions…
Implications of the r-mode instability of rotating relativistic stars
John L. Friedman, Keith H. Lockitch
Several recent surprises appear dramatically to have improved the likelihood that the spin of rapidly rotating, newly formed neutron stars (and, possibly, of old stars spun up by a…
The rotational modes of relativistic stars: Analytic results
Keith H. Lockitch, Nils Andersson, John L. Friedman
We study the r-modes and rotational ``hybrid'' modes of relativistic stars. As in Newtonian gravity, the spectrum of low-frequency rotational modes is highly sensitive to the stell…
Stability and rotational mixing of modes in Newtonian and relativistic stars
Keith H. Lockitch
Despite the recent excitement over the r-mode instability of rotating stars, these modes are not yet well-understood for stellar models appropriate to neutron stars - perfect fluid…
Gravitational-wave driven instability of rotating relativistic stars
John L. Friedman, Keith H. Lockitch
A brief review of the stability of rotating relativistic stars is followed by a more detailed discussion of recent work on an instability of r-modes, modes of rotating stars that h…
Where are the r-modes of isentropic stars?
Keith H. Lockitch, John L. Friedman
Almost none of the r-modes ordinarily found in rotating stars exist, if the star and its perturbations obey the same one-parameter equation of state; and rotating relativistic star…