Séminaire de Physique Théorique
Exploring dense matter with multi-messenger observations of Neutron StarsLami Suleiman (l'Univesité d'Etat de Californie et l'Université du Tennessee)
Thursday 10 October 2024 14:00 - Salle des séminaires - Salle 1180, bâtiment E2
Résumé :
Dense and isospin asymmetric matter is partly out of the reach of nuclear laboratories on Earth but comprises the deepest shells of the highly compact astrophysical objects that are Neutron Stars. An entire field of nuclear astrophysics, which includes multi-messenger astronomy, is devoted to exploring dense matter by observing Neutron Stars from their birth in core collapse supernovae to their deaths in mergers. Not only does Neutron Star's gravitational signature has allowed us to explore deviations from Einstein's theory of gravity, but combined with electromagnetic detections, it can inform on the nature of dense and neutron-rich matter, and on heavy element production in the Universe.
In this presentation, we consider the different methods used to probe dense matter with multi-messenger astronomy, beyond what can be achieved by nuclear physics experiments and theory. We present how radio, X-ray and gravitational wave detections have constrained the beta-equilibrated equation of state so far, and what the next-generation of detectors is expected to provide as improvement. We also discuss which measurements are susceptible to help us uncover Neutron Star's composition, and the presence of phase transitions to deconfined quark matter in their core. Finally, we shall consider certain theoretical assumptions that may break in an era of high precision detections, and how to improve nuclear and gravity theoretical models to offer better equation of state and neutrino emission modeling.
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