Gravitational-wave asteroseismology with fundamental modes from compact binary inspirals

Geraint Pratten (), Patricia Schmidt () and Tanja Hinderer ()
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Geraint Pratten: University of Birmingham
Patricia Schmidt: University of Birmingham
Tanja Hinderer: University of Amsterdam

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Gravitational waves (GWs) from binary neutron stars encode unique information about ultra-dense matter through characterisic signatures associated with a variety of phenomena including tidal effects during the inspiral. The main tidal signature depends predominantly on the equation of state (EoS)-related tidal deformability parameter Λ, but at late times is also characterised by the frequency of the star’s fundamental oscillation mode (f-mode). In General Relativity and for nuclear matter, Λ and the f-modes are related by universal relations which may not hold for alternative theories of gravity or exotic matter. Independently measuring Λ and the f-mode frequency enables tests of gravity and the nature of compact binaries. Here we present directly measured constraints on the f-mode frequencies of the companions of GW170817. We also show that future GW detector networks will measure f-mode frequencies to within tens of Hz, enabling precision GW asteroseismology with binary inspiral signals alone.

Date: 2020
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DOI: 10.1038/s41467-020-15984-5

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