Sökning: "cosmology"

Visar resultat 16 - 20 av 541 avhandlingar innehållade ordet cosmology.

  1. 16. Modelling and Detecting Kilonovae in the Rubin Observatory Era

    Författare :Christian N. Setzer; Hiranya Peiris; Jens Jasche; Stephen Smartt; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmology; transient surveys; kilonovae; neutron stars; population modelling; Physics; fysik;

    Sammanfattning : Survey astronomy is a powerful tool for discoveries in astrophysics and cosmology. In the coming years, this field will be revolutionised with the start of the ten-year Legacy Survey of Space and Time (LSST), to be conducted at the Vera C. Rubin Observatory. LÄS MER

  3. 17. Cosmological aspects of universal extra dimensions

    Författare :Torsten Bringmann; Lars Bergström; Pierre Binetruy; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cosmology; dark matter; extra dimensions; Cosmology; Kosmologi;

    Sammanfattning : It is an intriguing possibility that our world may consist of more than three spatial dimensions, compactified on such a small scale that they so far have escaped detection. In this thesis, a particular realization of this idea -- the scenario of so-called 'universal extra dimensions' (UED) -- is studied in some detail, with a focus on cosmological consequences and appplications. LÄS MER

  4. 18. Was Einstein Wrong? : Theoretical and observational constraints on massive gravity

    Författare :Marcus Högås; Edvard Mörtsell; David Mota; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Gravity; Massive gravity; Bimetric gravity; Cosmology; Gravitational collapse; Gravitational waves; Observational constraints; Theoretical Physics; teoretisk fysik;

    Sammanfattning : For more than a century, Einstein's theory of general relativity has described gravitational phenomena with astonishing precision. However, for the theory to fit observations we need to add two elusive substances: dark energy and dark matter. Together they add up to 95% of the energy budget of the Universe. LÄS MER

  5. 19. Sources of Dust Extinction in Type Ia Supernovae : Measurements and constraints from X-rays to the Infrared

    Författare :Joel Johansson; Edvard Mörtsell; Ariel Goobar; Rahman Amanullah; Bruno Leibundgut; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; supernovae; interstellar dust; circumstellar dust; cosmology; fysik; Physics;

    Sammanfattning : The use of Type Ia supernovae (SNe Ia) as distance indicators is essential for studying the expansion history of the Universe and for exploring the nature of dark energy. However, a lack of understanding of the progenitor systems and the empirically derived colour-brightness corrections represent severe limitations for SNe Ia as cosmological probes. LÄS MER

  7. 20. Heating the Early Universe : Numerical Methods and Their Analysis

    Författare :Kai Yan Lee; Garrelt Mellema; Dominique Aubert; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmology; Astronomy; astronomi;

    Sammanfattning : During the epoch when the first collapsed structures formed (6.... LÄS MER