Lunch talk on Sep. 29, 2025

The Nucleosynthesis Contribution of Neutrino-Dominated Accretion Flows to the Chemical Evolution of Astrophysical Systems on Different Scales

Speaker: Yanqing Qi (NJU)

Venue: SWIFAR Building 2111

Time: 12:45 PM, Monday, Sep. 29, 2025

Abstract: 

Metals heavier than helium in the universe are primarily produced through supernova explosions and compact binary mergers. During the collapse of massive stars or the merger of compact binaries (such as neutron star–neutron star or black hole–neutron star systems), a black hole accretion system with strong outflows is typically formed at the center. Under high accretion rates, the system can enter the neutrino-dominated accretion flow (NDAF) phase, where nucleosynthesis in the outflows can produce heavy elements for both supernovae and kilonovae, contributing significantly to the metal enrichment of galaxies. This talk will introduce the nucleosynthesis and multi-messenger signals of NDAF with outflows. I will present the impact of NDAF outflows on chemical evolution in high-redshift quasars, and the solar neighborhood, show the anisotropic kilonova, MeV neutrinos, and gravitational waves from compact binary mergers, and discuss gravitationally lensed kilonova.

Report PPT:  SWIFAR_Yanqing Qi.pdf