Bulletin of the American Physical Society
APS April Meeting 2013
Volume 58, Number 4
Saturday–Tuesday, April 13–16, 2013; Denver, Colorado
Session C10: Coalescing Binary Waveforms |
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Sponsoring Units: GGR Chair: Carlos Lousto, Rochester Institute of Technology Room: Governor's Square 12 |
Saturday, April 13, 2013 1:30PM - 1:42PM |
C10.00001: Simulations of coalescing binary black holes: Key Elements of Robustness Bela Szilagyi The first equal mass non-spinning BBH run done with the Spectral Einstein Code (SpEC) required extensive hand-tuning, experimentation, and a large amount of human time. Today we are running complete simulations in large numbers, continuously expanding the boundaries of what we can reach in the parameter space of Binary Black Hole systems. The talk will highlight some of the essential elements of what made this difference in SpEC. [Preview Abstract] |
Saturday, April 13, 2013 1:42PM - 1:54PM |
C10.00002: Simulations of coalescing binary black holes: Testing and validation Mark Scheel Gravitational waves from binary black hole systems are expected to be measurable by Advanced LIGO within a few years. We have constructed a pseudospectral evolution code that can accurately simulate such a system through dozens of orbits, plus merger and ringdown, for generic parameter choices including those that lead to significant precession. We are building a database that so far includes over 100 many-orbit high-accuracy BBH simulations, which can be downloaded and used for LIGO science. We discuss how we estimate errors in these simulations, and we present tests of robustness over different choices of simulation details such as gauge conditions, wave-extraction technique, and initial data formulation. [Preview Abstract] |
Saturday, April 13, 2013 1:54PM - 2:06PM |
C10.00003: Coalescing binary black holes: Applications enabled by many simulations Harald Pfeiffer Recently, the Caltech-Cornell-CITA collaboration has succeeded in computing about 100 binary black hole (BBH) coalescence waveforms. These waveforms include a very long inspiral phase (some exceeding 60 cycles) and are of exquisite accuracy. The configurations simulated include extreme regions of the BBH parameter space like nearly extremal spins, high mass-ratios, and strongly precessing systems. This talk reports on applications of these waveforms to study strong field gravity and aid gravitational wave astronomy, in particular post-Newtonian comparisons and construction of template banks for BBH waveforms. [Preview Abstract] |
Saturday, April 13, 2013 2:06PM - 2:18PM |
C10.00004: Accurate modeling of inspiral-merger-ringdown waveforms from non-precessing, spinning black-hole binaries Andrea Taracchini, Yi Pan, Alessandra Buonanno, Enrico Barausse, Michael Boyle, Tony Chu, Geoffrey Lovelace, Harald Pfeiffer, Mark Scheel Accurate analytical modeling of the gravitational-wave signal emitted by the coalescence of compact binaries is needed for the detection of these events with Advanced LIGO. I will present an effective one body (EOB) model which can generate time-domain inspiral-merger-ringdown waveforms for non-precessing spinning black-hole binaries with any mass ratio and individual black-hole spins in the range [-1,0.7]. This model was calibrated to five nonspinning and two mildly spinning numerical-relativity waveforms computed by the Spectral Einstein Code (SpEC) code, and incorporates results from extreme-mass-ratio simulations based on the Teukolsky equation. As a way of testing the proposed model, I will show comparisons with several numerical-relativity waveforms produced by the NRAR collaboration, which were not used in the calibration. [Preview Abstract] |
Saturday, April 13, 2013 2:18PM - 2:30PM |
C10.00005: Developments in IRS Multi-Mode Waveforms Bernard Kelly, John Baker The IRS picture [Baker et al. PRD 78:044046 (2008); Kelly et al. 84:084009 (2011)] visualises black-hole-binary late-inspiral/merger/ringdown gravitational waveforms as being generated by a single rotating source, with most important waveform angular modes being locked in phase through merger into ringdown. This led to the development of late-merger/ringdown waveform templates for the dominant modes of the binary for nonspinning black holes, and for holes with aligned (non-precessing) spins. During development of the IRS model, it was noticed that certain subdominant modes --- most notably the (3,2) mode --- suffered from non-monotonic bumps in both frequency and amplitude, indicative of some kind of mode-mixing behavior. We report on the resolution of this ``bumpy'' behavior, and of consequent developments to the IRS waveforms across multiple significant angular modes. [Preview Abstract] |
Saturday, April 13, 2013 2:30PM - 2:42PM |
C10.00006: Simulating precessing binary black hole systems Serguei Ossokine, Lawrence Kidder, Harald Pfeiffer, Michael Boyle, Abdul Mroue Binary black hole systems are a promising source of gravitational waves for the next generation of detectors like Advanced LIGO and VIRGO. Of particular interest are systems with strong orbital plane precession, as new features in the gravitational waveform arise, for which gravitational wave data-analysis is less well understood. One of the challenges of simulating such systems using the psedo-spectral numerical relativity code SpEC (Spectral Einstein Code) is discussed, and a novel solution using quaternions is described. Results of applying this technique to fully numerical relativity simulations of strongly precessing binaries (where the orientation of the orbital plane changes by greater than 90 degrees) are presented. [Preview Abstract] |
Saturday, April 13, 2013 2:42PM - 2:54PM |
C10.00007: Precession Effects in Gravitational Waves from Compact Binaries Antoine Klein, Neil Cornish, Nico Yunes We calculate computationally-efficient gravitational waveforms for precessing quasi-circular binaries. These waveforms are based on the stationary phase approximation and are designed to reproduce as closely as possible waveforms calculated by solving the post-Newtonian equations of motion numerically and evaluating a discrete Fourier transform of the time series. [Preview Abstract] |
Saturday, April 13, 2013 2:54PM - 3:06PM |
C10.00008: Periastron advance for a spinning particle in Kerr spacetime Tanja Hinderer, Alessandra Buonanno For a spinning particle in Kerr spacetime we calculate the periastron advance, the ratio of the azimuthal and radial frequencies for small librations around a circular equatorial orbit. The frequencies can be derived either from the fully constrained Hamiltonian or by computing Lyapunov exponents directly from the Papapetrou equations of motion. We discuss the use of different spin supplementary conditions corresponding to different reference worldlines for defining the particle's spin dipole moment. Our results will be useful for improving the modelling of binary inspirals and for comparisons with numerical simulations. [Preview Abstract] |
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