Speaker
Description
In this talk I shall present the mass twins compact star phenomenon together with the idea behind their existence and the motivation for searches. I will briefly review the special features in the equation of state (EoS) of the twins as well as their properties as compact stars. Such macroscopical properties can be tested with state-of-the-art multi-messenger astronomical observations. I will discuss the possibility that the HESS J1731-347 object is a compact star twin and the corresponding implications. Furthermore, I will address the study of gravitational wave signals from mergers and from f-modes of twins, as well as their existence as an explanation of very eccentric orbits of binary systems and production of isolated neutron stars. The compact star twins idea can be naturally be generalized to more than two compact stars of the same mass which will feature several phase transitions in the EoS that describes them.