Joel E. Tohline

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As publishers establish a greater online presence as well as infrastructure to support the distribution of more varied information, the idea of an executable paper that enables greater interaction has developed. An executable paper provides more information for computational experiments and results than the text, tables, and figures of standard papers.(More)
R ecord keeping has always been an essential component of science and engineering, but it has become even more so recently. As computers get faster, we perform increasingly complex computa-tions—and as storage gets cheaper, we accumulate larger volumes of data. The complete process, from data acquisition through analysis, is inherently exploratory: users(More)
We model two mergers of orbiting binary neutron stars, the first forming a black hole and the second a differentially rotating neutron star. We extract gravitational waveforms in the wave zone. Comparisons to a post-Newtonian analysis allow us to compute the orbital kinematics, including trajectories and orbital eccentricities. We verify our code by(More)
We investigate the influence of magnetic fields upon the dynamics of, and resulting gravitational waves from, a binary neutron-star merger in full general relativity coupled to ideal magnetohydrodynamics. We consider two merger scenarios: one where the stars have aligned poloidal magnetic fields and one without. Both mergers result in a strongly(More)
We describe computational tools that have been developed to simulate dynamical mass transfer in semi-detached, polytropic binaries that are initially executing synchronous rotation upon circular orbits. Initial equilibrium models are generated with a self-consistent field algorithm; models are then evolved in time with a parallel, explicit, Eulerian(More)
We show that an exact expression for the GreenÏs function in cylindrical coordinates is 1 o x [ x@ o \ 1 nJRR@ ; m/~= = eim(Õ~Õ {)Q m~1@2 (s), where and is the half-integer degree Legendre function of the s 4 [R2]R@ 2 ](z[z@)2]/(2RR@), Q m~1@2 second kind. This expression is signiÐcantly more compact and easier to evaluate numerically than the more familiar(More)
We present numerical simulations of dynamically unstable mass transfer in a double white dwarf binary with initial mass ratio, q = 0.4. The binary components are approximated as polytropes of index n = 3/2 and the initially synchronously rotating, semi-detached equilibrium binary is evolved hydrody-namically with the gravitational potential being computed(More)