http://arxiv.org/abs/2102.02357
We investigate the possibility of having massive compact stars, $(M>2M_{\odot})$, and at the same time fulfilling the theoretical bounds on the speed of sound $c_s$ in dense matter suggesting that the conformal limit of $c_s^2=1/3$ is approached from below as the density increases. This is possible if two families of stars exist: hadronic stars and quark stars, the latter being entirely composed by quark matter. By using astrophysical data on electromagnetic and gravitational waves signals of a few sources interpreted as quark stars, we show, within a Bayesian analysis framework, that the posterior distribution of $c_s^2$ is peaked around 0.3, and the maximum mass of the most probable equation of state is $\sim 2.13 M_{\odot}$. We finally discuss also the possibility that the maximum mass is larger than $2.6M_{\odot}$ as it could be the case if the secondary component of GW190814 is a compact star and not a black hole.
S. Traversi, P. Char, G. Pagliara, et. al.
Fri, 5 Feb 21
66/66
Comments: N/A