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Multi-messenger emission from gamma-ray bursts

Time: Wed 2020-06-10 15.15

Location: Via Zoom:, Du som saknar dator/datorvana kan kontakta för information, Stockholm (English)

Subject area: Physics, Atomic, Subatomic and Astrophysics

Doctoral student: Filip Samuelsson , Partikel- och astropartikelfysik, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.

Opponent: Professor Peter Mészáros, Pennsylvania Univ, Dept Phys, University Park, Pennsylvania 16802, USA

Supervisor: Professor Felix Ryde, Partikel- och astropartikelfysik

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Multi-messenger astronomy is a very hot topic in the astrophysical community. A messenger is something that carries information. Different astrophysical messenger types are photons, cosmic rays, neutrinos, and gravitational waves. They all carry unique and complementary information to one another. The idea with multi-messenger astronomy is that the more different types of messengers one can obtain from the same event, the more complete the physical picture becomes.

In this thesis I study the multi-messenger emission from gamma-ray bursts (GRBs), the most luminous events known in the Universe. Specifically, I study the connection of GRBs to extremely energetic particles called ultra-high-energy cosmic rays (UHECRs). UHECRs have unknown origin despite extensive research. GRBs have long been one of the best candidates for the acceleration of these particles but a firm connection is yet to be made. In Paper I and Paper II, we study the possible GRB-UHECR connection by looking at the electromagnetic radiation from electrons that would also be accelerated together with the UHECR. My conclusion is that the signal from these electrons does not match current GRB observation, disfavoring that a majority of UHECRs comes from GRBs.