Gravitational-wave asteroseismology with fundamental modes from compact binary inspirals.

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 ?, 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, ? and the f-modes are related by universal relations which may not hold for alternative theories of gravity or exotic matter. Independently measuring ? 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.

SUBMITTER: Pratten G 

PROVIDER: S-EPMC7242351 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature