Gravitational waves from pulsations of neutron stars described by realistic Equations of State

Abstract

In this work we discuss the time-evolution of nonspherical perturbations of a nonrotating neutron star described by a realistic Equation of State (EOS). We analyze 10 different EOS for a large sample of neutron star models. Various kind of generic initial data are evolved and the corresponding gravitational wave signals are computed. We focus on the dynamical excitation of fluid and spacetime modes and extract the corresponding frequencies. We employ a constrained numerical algorithm based on standard finite differencing schemes which permits stable and long term evolutions. Our code provides accurate waveforms and allows to capture, via Fourier analysis of the energy spectra, the frequencies of the fluid modes with an accuracy comparable to that of frequency domain calculations. The results we present here are useful for provindig comparisons with simulations of nonlinear oscillations of (rotating) neutron star models as well as testbeds for 3D nonlinear codes.

17 pages, 9 figures. Small changes. Version published in Phys. Rev. D

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• Exotic Compact Objects: The Dark White Dwarf
• Systematic errors due to quasi-universal relations in binary neutron stars and their correction for unbiased model selection
• High-Order Multipole and Binary Love Number Universal Relations
• ROXAS: a new pseudospectral non-linear code for general relativistic oscillations of fast rotating isolated neutron stars
• Radial Oscillations of Viscous Stars
• Investigating the mass-ratio dependence of the prompt-collapse threshold with numerical-relativity simulations