Search for dissertations about: "NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik"

Showing result 16 - 19 of 19 swedish dissertations containing the words NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik.

  2. 16. Photospheric emission from structured, relativistic jets : applications to gamma-ray burst spectra and polarization

    Author : Christoffer Lundman; Felix Ryde; Andrei Beloborodov; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; gamma-ray bursts; photospheric emission; radiative processes; polarization; special relativity;

    Abstract : 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. READ MORE

  4. 17. Photospheric emission in gamma-ray bursts

    Author : Christoffer Lundman; Felix Ryde; Stephan Rosswog; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : 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. READ MORE

  5. 18. Measurements of cosmic ray antiprotons with PAMELA and studies of propagation models

    Author : Juan Wu; Mark Pearce; Fiorenza Donato; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; cosmic ray; PAMELA; antiproton flux; propagation;

    Abstract : 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. READ MORE

  6. 19. Propagation of cosmic rays in the galaxy and their measurements at very high energies with LORA

    Author : Satyendra Thoudam; The Netherlands Radboud University Nijmegen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astroparticle Physics; Astropartikelfysik;

    Abstract : .... READ MORE