Speaker
Description
In this talk I will dicuss the production of multiple messengers in multi-collision models of gamma-ray bursts (GRBs). In the internal shock model for GRBs, their prompt emission is generated by collisions of regions with different Lorentz factors in the GRB jet (shells). Multi-collision models take the full dynamic of the jet into account generating a range of collisions happening at different radii. This separates the production of different messengers: While neutrinos are dominantly produced at small radii, ultra-high energy cosmic rays (UHECRs) escape mostly at intermediate radii. This can significantly reduce the neutrino flux from GRBs compared to the simpler one-zone models of GRBs.
I will explain the impact of two important model assumptions - the two-shell-collision dynamics and initial engine setup - on the ejected spectra of UHECRs and neutrinos. I will also dicuss the requirements for fitting the UHECR spectrum and composition within this model while taking into account neutrino constraints.
