Tidal polarizability effects in neutron star mergers

10th International LISA Symposium

Bernuzzi, S.^1 ; Nagar, A.^2 ; Balmelli, S.^3 ; Dietrich, T.^1 ; Ujevic, M.^4

Theoretical Physics Institute, University of Jena, Jena

07743, Germany^1

Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette

91440, France^2

Physik-Institut, Universität Zürich, Zürich

8057, Switzerland^3

Centro de Ciências Naturais e Humanas, Universidade Federal Do ABC, Santo-Andre, Sao Paulo

09210-170, Brazil^4

关键词: Additional dependences;    Binary neutron stars;    Coupling constants;    Equation of state;    Neutron stars;    Numerical relativity;    Polarizability effects;    Specific binding;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/610/1/012047/pdf
DOI  :  10.1088/1742-6596/610/1/012047

来源: IOP

【 摘 要 】

Using the analytical effective-one-body model and nonlinear 3+1 numerical relativity simulations, we investigate binary neutron star mergers. It is found that, for nonspinning binaries, both the mass-rescaled gravitational wave frequency at merger and the specific binding energy at merger almost uniquely depend on the tidal coupling constants κT2, which are functions of the stars' Love numbers, compactnesses and mass ratio. These relations are quasiuniversal in the sense that there is an additional dependence on the spins, which is linear for realistic spins values χ0.1. In the effective-one-body model, the quasiuniversality is a direct consequence of the conservative dynamics of tidally interacting bodies. In the context of gravitational wave astronomy, our findings may be used to constrain the neutron stars' equation of state using waveforms that accurately model the merger.