Sökning: "NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik"
Visar resultat 16 - 19 av 19 avhandlingar innehållade orden NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik.
16. Photospheric emission from structured, relativistic jets : applications to gamma-ray burst spectra and polarization
Sammanfattning : The radiative mechanism responsible for the prompt gamma-ray burst (GRB) emission remains elusive. For the last decade, optically thin synchrotron emission from shocks internal to the GRB jet appeared to be the most plausible explanation. LÄS MER
17. Photospheric emission in gamma-ray bursts
Sammanfattning : This thesis considers emission from gamma-ray bursts (GRBs), the most powerful explosions known in the Universe. Most GRBs are likely associated with the final stages of stellar evolution, where the core of a massive star collapses, and gives birth to a highly compact object such as a neutron star or black hole. LÄS MER
18. Measurements of cosmic ray antiprotons with PAMELA and studies of propagation models
Sammanfattning : Studying the acceleration and propagation mechanisms of Galactic cosmic rays can provide information regarding astrophysical sources, the properties of our Galaxy, and possible exotic sources such as dark matter. To understand cosmic ray acceleration and propagation mechanisms, accurate measurements of different cosmic ray elements over a wide energy range are needed. LÄS MER
19. Propagation of cosmic rays in the galaxy and their measurements at very high energies with LORA
Sammanfattning : .... LÄS MER