Constraints on the hadron-quark phase transition and the properties of twin stars with GW170817
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
20/06/2019 - 00/00/0000
Hybrid stars are compact stars that consist of a core of pure quark or mixed hadron-quark matter and outer layers of hadronic (or nuclear) matter. Depending on its features, the hadron-quark phase transition can lead to a separate mass-radius stable branch of hybrid stars and therefore to "twin-star" solutions, i.e. stars with similar masses and different radii.

Therefore, a proof of the existence of twin stars by experimental measurements of masses radii and tidal deformabilities may provide a signature for a phase transition inside neutron stars.

In this talk, I will show that the data from the gravitational-wave event GW170817 is compatible with the existence of twin stars and could also be interpreted as the merger of a binary system of hybrid stars or of a hybrid star with a neutron star. In addition, combining the 2Msun observations and the information from GW170817 I will set constraints on the parameters that characterise the phase transition, the maximum masses, and the radii of 1.4Msun stars described by equations of state supporting twin-star configurations.
Attached Documents
Generalitat de CatalunyaUniversitat de BarcelonaUniversitat Autònoma de BarcelonaUniversitat Politècnica de CatalunyaConsejo Superior de Investigaciones CientíficasCentres de Recerca de Catalunya