Matter effects on binary neutron star waveforms

Using an extended set of equations of state and a multiple-group multiple-code collaborative effort to generate waveforms, we improve numerical-relativity-based data-analysis estimates of the measurability of matter effects in neutron-star binaries. We vary two parameters of a parametrized piecewise...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2013-08, Vol.88 (4), Article 044042
Main Authors: Read, Jocelyn S., Baiotti, Luca, Creighton, Jolien D. E., Friedman, John L., Giacomazzo, Bruno, Kyutoku, Koutarou, Markakis, Charalampos, Rezzolla, Luciano, Shibata, Masaru, Taniguchi, Keisuke
Format: Article
Language:English
Subjects:
Acquisitions
Construction
Equations of state
Estimates
Mathematical models
Neutron stars
Searching
Waveforms
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Summary:Using an extended set of equations of state and a multiple-group multiple-code collaborative effort to generate waveforms, we improve numerical-relativity-based data-analysis estimates of the measurability of matter effects in neutron-star binaries. We vary two parameters of a parametrized piecewise-polytropic equation of state (EOS) to analyze the measurability of EOS properties, via a parameter [Lambda] that characterizes the quadrupole deformability of an isolated neutron star. We find that, to within the accuracy of the simulations, the departure of the waveform from point-particle (or spinless double black-hole binary) inspirai increases monotonically with [Lambda] and changes in the EOS that did not change [Lambda] are not measurable. We estimate with two methods the minimal and expected measurability of [Lambda] in second- and third-generation gravitational-wave detectors. The first estimate using numerical waveforms alone shows that two EOSs which vary in radius by 1.3 km are distinguishable in mergers at 100 Mpc. The second estimate relies on the construction of hybrid waveforms by matching to post-Newtonian inspiral and estimates that the same EOSs are distinguishable in mergers at 300 Mpc. We calculate systematic errors arising from numerical uncertainties and hybrid construction, and we estimate the frequency at which such effects would interfere with template-based searches.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.88.044042