Tidal polarizability effects in neutron star mergers

GND
1264229100
Zugehörigkeit
Theoretical Physics Institute, University of Jena , 07743 Jena,Germany
Bernuzzi, S;
Zugehörigkeit
Institut des Hautes Etudes Scientifiques , 91440 Bures-sur-Yvette,France
Nagar, A;
GND
1210562952
Zugehörigkeit
Physik-Institut, Universität Zürich , 8057 Zürich,Switzerland
Balmelli, S;
GND
1104751291
Zugehörigkeit
Theoretical Physics Institute, University of Jena , 07743 Jena,Germany
Dietrich, T;
Zugehörigkeit
Centro de Ciências Naturais e Humanas, Universidade Federal do ABC , 09210-170, Santo Andre, Sao Paulo,Brazil
Ujevic, M

Abstract 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 κ T 2 , 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 χ ≲ 0.1. 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.

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