Speaker
Andrea Lavagno
(TO)
Description
The existence of stars with masses up to 2 M_S and the hints of the existence of stars with radii smaller than about 11 km seem to require, at the same time, a stiff and a soft hadronic equation of state at large densities. We argue that these two apparently contradicting constraints could be actually an indication of the existence of two families of compact stars: hadronic stars, whose equation of state is soft, can be very compact, while quark stars, whose equation of state is stiff, can be very massive. In this respect, a crucial role is played, in the hadronic equation of state, by the delta isobars whose early appearance shifts to large densities the formation of hyperons.
Primary author
Andrea Lavagno
(TO)
Co-authors
Alessandro Drago
(FE)
Giuseppe Pagliara
(FE)
