Search for dissertations about: "gamma-ray bursts"

Showing result 1 - 5 of 22 swedish dissertations containing the words gamma-ray bursts.

2. 1. Photospheric emission in gamma ray bursts : Analysis and interpretation of observations made by the Fermi gamma ray space telescope

   Author : Shabnam Iyyani; Felix Ryde; David Burrows; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; gamma ray bursts; photosphere; radiation mechanism; Theoretical Physics; teoretisk fysik;

   Abstract : The large flashes of radiation that are observed in GRBs are generally believed to arise in a relativistic jetted outflow. This thesis addresses the question of how and where in the jet this radiation is produced. READ MORE

4. 2. Multi-messenger emission from gamma-ray bursts

   Author : Filip Samuelsson; Felix Ryde; Peter Mészáros; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; astrophysics; gamma-ray bursts; cosmic rays; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Abstract : 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. READ MORE

5. 3. Microphysical Conditioning of Gamma-Ray Burst Shocks

   Author : Jacob Trier Frederiksen; Claes Fransson; Åke Nordlund; Mikhail V. Medvedev; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetic fields; particle acceleration; plasma instabilities; gamma-ray bursts; collisionless shocks; relativistic outflows; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

   Abstract : Gamma-Ray Bursts (GRBs) are believed to be connected with either collapse of massive stars or – in some cases – coalescing neutron stars, both of which cause extreme relativistic explosions observable from the entire Universe. GRBs produce rapid flashes of high energy radiation, extending up to 2MeV in photon energies: as much energy per photon as the rest mass of 4 electrons. READ MORE

6. 4. Statistical Investigations ofthe Emission Processes in Gamma-ray Bursts

   Author : Zeynep Acuner; Felix Ryde; Judith Racusin; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; gamma-ray bursts; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Abstract : Physical emission mechanisms responsible for gamma-ray bursts (GRBs) remain elusive to this day, 50 years after their discovery. Although there are well studied physical models, their power to explain the observed data is a matter of debate. READ MORE

7. 5. Cosmic rays and shock physics in gamma-ray bursts

   Author : Filip Samuelsson; Felix Ryde; Robert Mochkovitch; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; astrophysics; gamma-ray bursts; cosmic rays; radiation-mediated shocks; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Abstract : Gamma-ray bursts (GRBs) are the most luminous events in the known universe. Due to their tremendous energy output, they serve as laboratories of physics far beyond anything that we can hope to achieve in terrestrial experiments. READ MORE