Sökning: "early universe"

Visar resultat 1 - 5 av 54 avhandlingar innehållade orden early universe.

  1. 1. Heating the early Universe

    Författare :Kai Yan Lee; Garrelt Mellema; Markus Kromer; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomy; astronomi;

    Sammanfattning : .... LÄS MER

  3. 2. 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

  4. 3. Probing the early Universe with B-mode polarization : The Spider instrument, optical modelling and non-Gaussianity

    Författare :Adriaan Judocus Duivenvoorden; Katherine Freese; Jón Emil Gudmundsson; Juan García-Bellido; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmic microwave background; early universe; polarimetry; telescopes; fysik; Physics;

    Sammanfattning : One of the main goals of modern observational cosmology is to constrain or detect a stochastic background of primordial gravitational waves. The existence of such a background is a generic prediction of the inflationary paradigm: the leading explanation for the universe's initial perturbations. LÄS MER

  5. 4. Dust in the early universe

    Författare :Erik Elfgren; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Fysik;

    Sammanfattning : This Licentiate thesis treats the impact of early dust on the Cosmic Microwave Background (CMB). The dust that is studied comes from the first generation of stars, which were hot and short-lived, ending their lives as giant supernovæ. LÄS MER

  7. 5. The Frequency of Supernovae in the Early Universe

    Författare :Jens Melinder; Claes Fransson; Enrico Cappellaro; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; supernovae; supernova typing; supernova rates; photometric redshifts; Lyman Break Galaxies; Astronomy; Astronomi; Astronomy; astronomi;

    Sammanfattning : Supernovae are cosmic explosions of cataclysmic proportion that signify the death of a star. While being interesting phenomena in their own right, their brightness also make them excellent probes of the early universe. Depending on the type of the progenitor star and the origin of the explosion different subjects can be investigated. LÄS MER