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T: Fachverband Teilchenphysik

T 2: Hauptvorträge (Invited Talks) I

T 2.3: Hauptvortrag

Montag, 30. März 2020, 12:35–13:15, H-Aula

Cosmic Nucleosynthesis as a Multi-Messenger Challenge — •Roland Diehl — Max Planck Institut für extraterrestrische Physik, 85748 Garching, Germany

The origin of cosmic elements and isotopes is among the fundamental challenges of astrophysics. Identifying the origins of specific elements in supernova explosions, or most-recently in binary neutron star collisions, therefore promise breakthrough insights. In this talk, we review the astronomical messengers towards an understanding of cosmic nucleosynthesis in its diversity. Nuclear fusion reactions in cosmic sites produce new isotopes and elements. Observations of such cosmic nucleosynthesis can be direct, or circumstantial/indirect. The decay of unstable isotopes provides a unique and direct trace of a specific event and its nucleosynthesis; stardust or cosmic ray compositions within the solar system can be analysed, but are are less direct, offset in time and space. Indirectly, the effects of violent energy release in such an event, e.g. gravitational waves or a cooling envelope that re-radiates radioactive energy input in a supernova, also reflect aspects of the nuclear-reaction astrophysics. The characteristic evolutionary changes over cosmic times in abundances of cosmic-gas components, as they can be observed in stars that formed from an evolving seed composition, are commonly best known as observables of cosmic nucleosynthesis, as they had led to recognition of the cosmic compositional evolution. We will discuss how these multiple messengers of cosmic nucleosynthesis complement each other, starting from the kilonova/gravitational-wave event GW170817.