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The sum of Love: exploring the effective tidal deformability of neutron stars

The sum of Love: exploring the effective tidal deformability of neutron stars
The sum of Love: exploring the effective tidal deformability of neutron stars
Finite size effects come into play during the late stages of neutron star binary inspiral, with the tidal deformability of the supranuclear density matter leaving an imprint on the gravitational-wave signal. As demonstrated in the case of GW170817, this leads to a constraint on the neutron star radius (and hence the equation of state). A deeper understanding of the tidal response requires an analysis of both the state and composition of matter. While these aspects may not have dramatic impact, they could lead to systematic effects that need to be kept in mind as the observational data become more precise. As a step in this direction we explore the role of the composition of matter, which is likely to remain “frozen” during the late stages of binary inspiral. We provide the first in-depth analysis of the problem, including estimates of how composition impacts on the effective tidal deformability. The results provide improved insight into how aspects of physics that tend to be “ignored” impact on binary neutron star gravitational-wave signals.
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Pnigouras, Pantelis
e7fc1316-2ac6-4f1a-8d7e-5b76e442e2bf
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Pnigouras, Pantelis
e7fc1316-2ac6-4f1a-8d7e-5b76e442e2bf

Andersson, Nils and Pnigouras, Pantelis (2019) The sum of Love: exploring the effective tidal deformability of neutron stars. arXiv. (In Press)

Record type: Article

Abstract

Finite size effects come into play during the late stages of neutron star binary inspiral, with the tidal deformability of the supranuclear density matter leaving an imprint on the gravitational-wave signal. As demonstrated in the case of GW170817, this leads to a constraint on the neutron star radius (and hence the equation of state). A deeper understanding of the tidal response requires an analysis of both the state and composition of matter. While these aspects may not have dramatic impact, they could lead to systematic effects that need to be kept in mind as the observational data become more precise. As a step in this direction we explore the role of the composition of matter, which is likely to remain “frozen” during the late stages of binary inspiral. We provide the first in-depth analysis of the problem, including estimates of how composition impacts on the effective tidal deformability. The results provide improved insight into how aspects of physics that tend to be “ignored” impact on binary neutron star gravitational-wave signals.

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Accepted/In Press date: 21 June 2019

Identifiers

Local EPrints ID: 435818
URI: http://eprints.soton.ac.uk/id/eprint/435818
PURE UUID: de246ad8-0653-4945-83b1-b81089e9cb57
ORCID for Nils Andersson: ORCID iD orcid.org/0000-0001-8550-3843
ORCID for Pantelis Pnigouras: ORCID iD orcid.org/0000-0003-1895-9431

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Date deposited: 21 Nov 2019 17:30
Last modified: 16 May 2020 00:53

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