Bulg. J. Phys. vol.44 no.S1 (2017), pp. 093-104

Bounds on the Speed of Sound, Tidal Polarizability and Gravitational Waves from Neutron Stars

Ch.C. Moustakidis, T. Gaitanos, Ch. Margaritis, G.A. Lalazissis
Department of Theoretical Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Abstract. The accurate determination of the maximum mass of the neutron stars is one of the most important tasks in astrophysics. It is directly related to the identification of the black holes in the universe, the production of neutron stars from the supernovae explosion, and the equation of state (EoS) of dense matter. The speed of sound in dense matter is also a crucial quantity which characterizes the stiffness of the EoS since its upper bound imposes strong constraints on the maximum mass of neutron stars. However, this upper bound remains still an open issue. In the present work we study possible effects of the upper bound of the speed of sound on the upper bound of the mass and the tidal polarizability. We conclude that these kinds of measurements, combined with recent observations of neutron stars with masses close to 2M, will provide robust constraints on the equation of state of hadronic matter at high densities.

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