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- Matthew Anderson, Eric W. Hirschmann, +5 authors Joel E. Tohline
- 2008

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)

- Matthew Anderson, Eric W Hirschmann, +5 authors Joel E Tohline
- Physical review letters
- 2008

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)

- Sarvnipun Chawla, Matthew Anderson, +4 authors David Neilsen
- Physical review letters
- 2010

We investigate the merger of a neutron star in orbit about a spinning black hole in full general relativity with a mass ratio of 5:1, allowing the star to have an initial magnetization of 10(12) G. We present the resulting gravitational waveform and analyze the fallback accretion as the star is disrupted. We see no significant dynamical effects in the… (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)

- Eric J. Hallman, Patrick M. Motl, Jack O. Burns, Michael L. Norman
- 2008

We critically analyze the measurement of galaxy cluster gas masses, which is central to cosmological studies that rely on the galaxy cluster gas mass fraction. Using synthetic observations of numerically simulated clusters viewed through their X-ray emission and thermal Sunyaev-Zeldovich effect (SZE), we reduce the observations to obtain measurements of the… (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)

- Carlos Palenzuela, Luis Lehner, +4 authors Patrick Motl
- Physical review letters
- 2013

The late stage of an inspiraling neutron-star binary gives rise to strong gravitational wave emission due to its highly dynamic, strong gravity. Moreover, interactions between the stellar magnetospheres can produce considerable electromagnetic radiation. We study this scenario using fully general relativistic, resistive magnetohydrodynamic simulations. We… (More)

- G. NELEMANS, M. BENACQUISTA, +17 authors L. R. YUNGELSON
- 2009

- Chris Loken, Michael L. Norman, Erik Nelson, Jack Burns, Greg L. Bryan, Patrick Motl
- 2002

We investigate the predicted present-day temperature profiles of the hot, X-ray emitting gas in galaxy clusters for two cosmological models-a current best-guess ΛCDM model and standard cold dark matter (SCDM). Our numerically-simulated " catalogs " of clusters are derived from high-resolution (15 h −1 kpc) simulations which make use of a sophisticated,… (More)

- David Neilsen, Luis Lehner, +4 authors Travis Garrett
- Proceedings of the National Academy of Sciences…
- 2011

The extraction of rotational energy from a spinning black hole via the Blandford-Znajek mechanism has long been understood as an important component in models to explain energetic jets from compact astrophysical sources. Here we show more generally that the kinetic energy of the black hole, both rotational and translational, can be tapped, thereby producing… (More)