title: Modeling the Dynamics of Tidally Interacting Binary Neutron Stars up to the Merger.
abstract: The data analysis of the gravitational wave signals emitted by coalescing neutron star binaries requires the availability of an accurate analytical representation of the dynamics and waveforms of these systems. We propose an effective-one-body model that describes the general relativistic dynamics of neutron star binaries from the early inspiral up to the merger. Our effective-one-body model incorporates an enhanced attractive tidal potential motivated by recent analytical advances in the post-Newtonian and gravitational self-force description of relativistic tidal interactions. No fitting parameters are introduced for the description of tidal interaction in the late, strong-field dynamics. We compare the model energetics and the gravitational wave phasing with new high-resolution multiorbit numerical relativity simulations of equal-mass configurations with different equations of state. We find agreement within the uncertainty of the numerical data for all configurations. Our model is the first semianalytical model that captures the tidal amplification effects close to merger. It thereby provides the most accurate analytical representation of binary neutron star dynamics and waveforms currently available.
authors.affiliation: TAPIR, California Institute of Technology, Pasadena, California 91125-0001, USA.|DiFeST, University of Parma, I-43124 Parma, Italy.
authors.forename: Sebastiano
authors.initials: S
authors.lastname: Bernuzzi
authors.affiliation: Institut des Hautes Etudes Scientifiques, 91440 Bures-sur-Yvette, France.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Nagar
authors.affiliation: Theoretical Physics Institute, University of Jena, 07743 Jena, Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Dietrich
authors.affiliation: Institut des Hautes Etudes Scientifiques, 91440 Bures-sur-Yvette, France.
authors.forename: Thibault
authors.initials: T
authors.lastname: Damour