Search for dissertations about: "Theoretical Astrophysics"

Showing result 1 - 5 of 86 swedish dissertations containing the words Theoretical Astrophysics.

  1. 1. Supersymmetry vis-à-vis Observation Dark Matter Constraints, Global Fits and Statistical Issues

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Yashar Akrami; Joakim Edsjö; Lars Bergström; Roberto Trotta; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; supersymmetry; cosmology of theories beyond the Standard Model; dark matter; gamma rays; dwarf galaxies; direct detection; statistical techniques; scanning algorithms; genetic algorithms; statistical coverage; NATURAL SCIENCES Physics Astronomy and astrophysics Astroparticle physics; NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik; NATURAL SCIENCES Physics Astronomy and astrophysics Cosmology; NATURVETENSKAP Fysik Astronomi och astrofysik Kosmologi; NATURAL SCIENCES Physics Elementary particle physics Astroparticle physics; NATURVETENSKAP Fysik Elementarpartikelfysik Astropartikelfysik; Theoretical Physics; teoretisk fysik;

    Abstract : Weak-scale supersymmetry is one of the most favoured theories beyond the Standard Model of particle physics that elegantly solves various theoretical and observational problems in both particle physics and cosmology. In this thesis, I describe the theoretical foundations of supersymmetry, issues that it can address and concrete supersymmetric models that are widely used in phenomenological studies. READ MORE

  2. 2. On the Winds of Carbon Stars and the Origin of Carbon A Theoretical Study

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lars Mattsson; Susanne Höfner; Nils Bergvall; Kjell Olofsson; Martin Groenewegen; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; AGB stars; carbon stars; mass loss; stellar winds; circumstellar matter; cosmic dust; stellar evolution; nucleosynthesis; galactic chemical evolution; NATURAL SCIENCES Physics Astronomy and astrophysics; NATURVETENSKAP Fysik Astronomi och astrofysik; Astronomy; Astronomi; Fysik; Physics;

    Abstract : Carbon is the basis for life, as we know it, but its origin is still largely unclear. Carbon-rich Asymptotic Giant Branch (AGB) stars (carbon stars) play an important rôle in the cosmic matter cycle and may contribute most of the carbon in the Galaxy. READ MORE

  3. 3. Theoretical Studies of Binaries in Astrophysics

    University dissertation from Lund Observatory, Lund University

    Author : Johann Dischler; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomi; Astronomy; Galaxy: centre; Stars: mass-loss; Binaries: close; Binaries: eclipsing;

    Abstract : This thesis introduces and summarizes four papers dealing with computer simulations of astrophysical processes involving binaries. The first part gives the rational and theoretical background to these papers. In paper I and II a statistical approach to studying eclipsing binaries is described. READ MORE

  4. 4. A Study of Grain Drift in C Stars Theoretical Modeling of Dust-Driven Winds in Carbon-Rich Pulsating Giant Stars

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Christer Sandin; Susanne Höfner; Bengt Gustafsson; Lee Anne Willson; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomy; hydrodynamics; radiative transfer; instabilities; dust formation; stars: AGB and post-AGB; stars: mass-loss; stars: variables: general; Astronomi; NATURAL SCIENCES Physics Astronomy and astrophysics; NATURVETENSKAP Fysik Astronomi och astrofysik; Theoretical Astrophysics; teoretisk astrofysik;

    Abstract : A major fraction of stars will pass through a short period of dramatic events in their final evolutionary stage. Low- to intermediate-mass stars, studied here, are stripped of their outer parts in a slow massive wind. This mass loss reshapes both the star and the surrounding medium. READ MORE

  5. 5. Theoretical and numerical bimetric relativity

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Francesco Torsello; Edvard Mörtsell; Eugeny Babichev; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; spin-2 fields; extension of general relativity; ghost-free bimetric theory; Hassan–Rosen bimetric relativity; numerical relativity; Theoretical Physics; teoretisk fysik;

    Abstract : General relativity (GR) is the standard physical theory describing gravitational interactions. All astrophysical and cosmological observations are compatible with its predictions, provided that unknown matter and energy components are included. These are called dark matter and dark energy. READ MORE