Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session M7: Gravitational Waveforms from Compact Object Binaries |
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Sponsoring Units: GGR Chair: Tyson Littenberg, Northwestern University Room: Key 3 |
Sunday, April 12, 2015 3:30PM - 3:42PM |
M7.00001: Analytical Templates for Generically Spin-Precessing Compact Binaries Katerina Chatziioannou, Antoine Klein, Nicolas Yunes, Neil Cornish Template based searches for gravitational waves from compact binaries are limited by the accuracy of the templates used. One of the main sources of error are precessional effects arising from the interactions of the spins of the two binary components, an efficient modeling of which can be important for detection and crucial for parameter estimation. In this talk, I will describe how the equations describing these precessional effects can be solved analytically. The resulting gravitational waveform can model spinning binaries of arbitrary spin magnitudes and orientations, and masses. [Preview Abstract] |
Sunday, April 12, 2015 3:42PM - 3:54PM |
M7.00002: Accuracy of Binary Black Hole waveforms for Advanced LIGO searches Prayush Kumar, Kevin Barkett, Swetha Bhagwat, Tony Chu, Heather Fong, Duncan Brown, Harald Pfeiffer, Mark Scheel, Bela Szilagyi Coalescing binaries of compact objects are flagship sources for the first direct detection of gravitational waves with LIGO-Virgo observatories. Matched-filtering based detection searches aimed at binaries of black holes will use aligned spin waveforms as filters, and their efficiency hinges on the accuracy of the underlying waveform models. A number of gravitational waveform models are available in literature, e.g. the Effective-One-Body, Phenomenological, and traditional post-Newtonian ones. While Numerical Relativity (NR) simulations provide for the most accurate modeling of gravitational radiation from compact binaries, their computational cost limits their application in large scale searches. In this talk we assess the accuracy of waveform models in two regions of parameter space, which have only been explored cursorily in the past: the high mass-ratio regime as well as the comparable mass-ratio$+$high spin regime.s Using the SpEC code, six q$=$7 simulations with aligned-spins and lasting 60 orbits, and tens of q $\in$ [1,3] simulations with high black hole spins were performed. We use them to study the accuracy and intrinsic parameter biases of different waveform families, and assess their viability for Advanced LIGO searches. [Preview Abstract] |
Sunday, April 12, 2015 3:54PM - 4:06PM |
M7.00003: The Effect of Spin Precession and Amplitude Corrections in Waveform Approximants on The Accuracy of Gravitational-Wave Searches Saeed Mirshekari, Riccardo Sturani As a part of reviewing post-Newtonian waveform approximants, we investigate the effect of (A) spin precession, (B) amplitude corrections, and (C) waveform bias on the modeling accuracy of gravitational waves emitted by compact binary systems including black-holes and neutron-stars. In particular, we focus on studying faithfulness, effectualness, and parameter-bias with the presence/absence of above mentioned factors (individually and in combination with each other) in both low mass ($3 M_{\odot} |
Sunday, April 12, 2015 4:06PM - 4:18PM |
M7.00004: Ambiguities in waveforms from precessing and recoiling black-hole binaries Michael Boyle Precessing and recoiling black-hole binaries will present some of the most interesting and complex sources for gravitational-wave astronomy. These systems push the limits of our understanding and techniques in both analytical and numerical relativity. In particular, the model spacetimes we use to describe these systems exhibit asymptotic gauge symmetries that are entirely arbitrary and uncontrolled, yet have direct impact on the waveforms. We must understand these effects in our models, in order to understand the effects on astrophysical measurements from gravitational-wave astronomy. I will describe these symmetries, demonstrate their effects on real waveforms, and discuss methods for eliminating the ambiguities. [Preview Abstract] |
Sunday, April 12, 2015 4:18PM - 4:30PM |
M7.00005: Gravitational Waveforms for generic precessing binaries in the Fourier domain Antoine Klein, Neil Cornish, Nicolas Yunes The first direct observations of gravitational waves are expected within the next few years. With this in mind, efficient waveforms are needed for reliable parameter estimation. We present here an algorithm for computing the inspiral gravitational wave response of a detector to a passing gravitational wave emitted by a fully generic precessing binary system in the Fourier domain. The algorithm can be used with any phasing or precession model, and should provide a substantial speed-up with respect to time-domain waveforms for inspiral-dominated systems. [Preview Abstract] |
Sunday, April 12, 2015 4:30PM - 4:42PM |
M7.00006: A frequency-domain approach to LISA binary black hole waveforms John Baker, Sylvain Marsat, Philip Graff We report on a recent effort to speed up the generation of gravitational wave signals from binary black holes in the context of space-based LISA-type detectors. Recently, reduced order models have been developed that allow for a fast and accurate generation of inspiral-merger-ringdown waveforms, directly in the Fourier domain. Contrarily to ground-based detectors, the response of LISA-type detectors is time-dependent, which introduces additional complexity in Fourier domain. We present a semi-analytical procedure to evaluate this Fourier-domain response, and present some preliminary applications. We comment on the expected increase in performance. [Preview Abstract] |
Sunday, April 12, 2015 4:42PM - 4:54PM |
M7.00007: Nonspinning numerical relativity waveform surrogates: Building the model Chad Galley Simulating binary black hole coalescences involves solving Einstein's equations with large-scale computing resources that can take months to complete for a single numerical solution. This engenders a computationally intractable problem for multiple-query applications related to parameter space exploration, data analysis for gravitational wave detectors like LIGO, and semi-analytical waveform fits. I discuss how reduced order modeling techniques are used to build accurate surrogates that can be evaluated quickly in place of numerically solving Einstein's equations for generating gravitational waveforms of nonspinning binary black hole coalescences. To within error, the surrogate can model all modes available from a numerical simulation including, for example, troublesome modes such as the (3,2) mode and memory modes. A companion talk will cover quantifying the best surrogate model's errors. The results of this work represent a significant advance by making it possible to use numerical relativity waveforms for multiple-query applications. [Preview Abstract] |
Sunday, April 12, 2015 4:54PM - 5:06PM |
M7.00008: Nonspinning numerical relativity waveform surrogates: assessing the model Scott Field, Jonathan Blackman, Chad Galley, Mark Scheel, Bela Szilagyi, Manuel Tiglio Recently, multi-modal gravitational waveform surrogate models have been built directly from data numerically generated by the Spectral Einstein Code (SpEC). I will describe ways in which the surrogate model error can be quantified. This task, in turn, requires (i) characterizing differences between waveforms computed by SpEC with those predicted by the surrogate model and (ii) estimating errors associated with the SpEC waveforms from which the surrogate is built. Both pieces can have numerous sources of numerical and systematic errors. We make an attempt to study the most dominant error sources and, ultimately, the surrogate model's fidelity. These investigations yield information about the surrogate model's uncertainty as a function of time (or frequency) and parameter, and could be useful in parameter estimation studies which seek to incorporate model error. Finally, I will conclude by comparing the numerical relativity surrogate model to other inspiral-merger-ringdown models. A companion talk will cover the building of multi-modal surrogate models. [Preview Abstract] |
Sunday, April 12, 2015 5:06PM - 5:18PM |
M7.00009: Surrogate waveform models Jonathan Blackman, Scott Field, Chad Galley, Mark Scheel, Bela Szilagyi, Manuel Tiglio With the advanced detector era just around the corner, there is a strong need for fast and accurate models of gravitational waveforms from compact binary coalescence. Fast surrogate models can be built out of an accurate but slow waveform model with minimal to no loss in accuracy, but may require a large number of evaluations of the underlying model. This may be prohibitively expensive if the underlying is extremely slow, for example if we wish to build a surrogate for numerical relativity. We examine alternate choices to building surrogate models which allow for a more sparse set of input waveforms. [Preview Abstract] |
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