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.
Author
Andrea Lavagno
(TO)
Co-authors
Alessandro Drago
(FE)
Giuseppe Pagliara
(FE)
