Search for dissertations about: "Accretion Discs"

Showing result 1 - 5 of 7 swedish dissertations containing the words Accretion Discs.

  2. 1. Formation and Evolution of Protoplanetary Discs

    Author : Johan Appelgren; Astrofysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Protoplanetary discs; Accretion discs; planet formation;

    Abstract : Protoplanetary discs and the protostars they surround are formed from the gravitational collapse of molecularcloud cores. These discs consist primarily of gas, with a small but important dust component. The roughlymm-sized grains that make up the dust component are the building blocks of planets. READ MORE

  4. 2. Transport, Turbulence and Instabilities in Cosmic Magnetic Fields

    Author : Giuseppe Di Bernardo; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Cosmic Rays; Interstella Medium; Galactic Magnetic Fields; Magnetohydrodynamics Turbulence; Accretion Discs;

    Abstract : This decade has seen a large number of space missions, which, alongside ground-based radio, optical and gamma-ray telescopes, have enabled a deep insight into the non-thermal astrophysical environments. Interstellar Medium (ISM), Supernovae Remnants (SNRs) and Black-Hole (BH) accretion discs (ADs) are only a few examples of natural habitat of interaction of relativistic particles and magnetic fields, largely mediated by the action of the turbulence. READ MORE

  5. 3. Cooling the Envelopes of Gas Giants : Accretion, structure formation and observability

    Author : Matthäus Schulik; Astronomi - Genomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Planet formation; Hydrodynamics; Giant planets;

    Abstract : We know now that discs of gas and dust, so-called protoplanetary discs, form planets as side-products of the naturally occurring star formation process throughout the Milky Way. Young, growing planets in such discs are commonly referred to as protoplanets. READ MORE

  6. 4. Modelling and analyzing strong-field effects in quantum plasma

    Author : Haidar Al-Naseri; Gert Brodin; Jens Zamanian; J. Tito Mendonca; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Plasma physics; Strong-field physics; Kinetic theory; Quantum plasma; fysik; Physics;

    Abstract : Under the extreme conditions that can be found around dense stars and in the accretion discs of black holes, several strong-field quantum phenomena dominate the dynamics of the plasma. This includes the creation of matter and anti-matter from the vacuum (Schwinger mechanism), radiation reaction and Landau quantization. READ MORE

  7. 5. Numerical simulations of type III planetary migration

    Author : Adam Peplinski; Pawel Artymowicz; Garrelt Mellema; John Papaloizou; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; planetary system formation; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

    Abstract : Planets are believed to form in primordial gas-dust discs surrounding newborn stars. An important breakthrough in our understanding of planetary formation was the discovery of extra-solar planets around sun-like stars, especially the frequent occurrence of giant planets on close orbits (hot Jupiters). READ MORE